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American Academy of Pediatrics
From the American Academy of PediatricsClinical Report

Evaluating Children With Fractures for Child Physical Abuse

Emalee G. Flaherty, Jeannette M. Perez-Rossello, Michael A. Levine, William L. Hennrikus, and the AMERICAN ACADEMY OF PEDIATRICS COMMITTEE ON CHILD ABUSE AND NEGLECT, SECTION ON RADIOLOGY, SECTION ON ENDOCRINOLOGY, SECTION ON ORTHOPAEDICS and the SOCIETY FOR PEDIATRIC RADIOLOGY
Pediatrics February 2014, 133 (2) e477-e489; DOI: https://doi.org/10.1542/peds.2013-3793
Emalee G. Flaherty
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Jeannette M. Perez-Rossello
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Michael A. Levine
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William L. Hennrikus
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Abstract

Fractures are common injuries caused by child abuse. Although the consequences of failing to diagnose an abusive injury in a child can be grave, incorrectly diagnosing child abuse in a child whose fractures have another etiology can be distressing for a family. The aim of this report is to review recent advances in the understanding of fracture specificity, the mechanism of fractures, and other medical diseases that predispose to fractures in infants and children. This clinical report will aid physicians in developing an evidence-based differential diagnosis and performing the appropriate evaluation when assessing a child with fractures.

  • fractures
  • Abbreviations:
    CML —
    classic metaphyseal lesions
    CPR —
    cardiopulmonary resuscitation
    CT —
    computed tomography
    OI —
    osteogenesis imperfect
  • Under Review

    This policy automatically expired and is under review by the authorship team.

    Introduction

    Fractures are the second most common injury caused by child physical abuse; bruises are the most common injury.1 Failure to identify an injury caused by child abuse and to intervene appropriately may place a child at risk for further abuse, with potentially permanent consequences for the child.2–4 Physical abuse may not be considered in the physician’s differential diagnosis of childhood injury because the caregiver may have intentionally altered the history to conceal the abuse.5 As a result, when fractures are initially evaluated, a diagnosis of child abuse may be missed.3 In children younger than 3 years, as many as 20% of fractures caused by abuse may be misdiagnosed initially as noninflicted or as attributable to other causes.3 In addition, fractures may be missed because radiography is performed before changes are obvious or the radiographic images are misread or misinterpreted.2 However, incorrectly diagnosing physical abuse in a child with noninflicted fractures has serious consequences for the child and family. To identify child abuse as the cause of fractures, the physician must take into consideration the history, the age of the child, the location and type of fracture, the mechanism that causes the particular type of fracture, and the presence of other injuries while also considering other possible causes.

    Differential Diagnosis of Fractures

    Trauma: Child Abuse Versus Noninflicted Injuries

    Fractures are a common childhood injury and account for between 8% and 12% of all pediatric injuries.6–8 In infants and toddlers, physical abuse is the cause of 12% to 20% of fractures.9 Although unintentional fractures are much more common than fractures caused by child abuse, the physician needs to remain aware of the possibility of inflicted injury. Although some fracture types are highly suggestive of physical abuse, no pattern can exclude child abuse.10,11 Specifically, it is important to recognize that any fracture, even fractures that are commonly noninflicted injuries, can be caused by child abuse. Certain details that can help the physician determine whether a fracture was caused by abuse rather than unintentional injury include the history, the child’s age and developmental stage, the type and location of the fracture, the age of the fracture, and an understanding of the mechanism that causes the particular type of fracture. The presence of multiple fractures, fractures of different ages or stages of healing, delay in obtaining medical treatment, and the presence of other injuries suspicious for abuse (eg, coexisting injuries to the skin, internal organs, or central nervous system) should alert the physician to possible child abuse.

    Child’s Age and Development

    The physician should consider the child’s age and level of development. Approximately 80% of all fractures caused by child abuse occur in children younger than 18 months,12 and approximately one-quarter of fractures in children younger than 1 year are caused by child abuse.1,9,13–15 Physical abuse is more likely to be the cause of femoral fractures and humeral fractures in children who are not yet walking compared with children who are ambulatory,15–18 and the percentage of fractures caused by abuse declines sharply after the child begins to walk.9,19,20

    Fracture Specificity for Abuse

    Fractures With High Specificity for Abuse

    As shown in Table 1, certain fractures have high specificity for or strong association with child abuse, particularly in infants, whereas others may have less specificity.21 Rib fractures in infants, especially those situated posteromedially, and the classic metaphyseal lesions of long bones, have high specificity for child abuse. Fractures of the scapula, spinous process, and sternum also have high specificity for abuse but are uncommon.

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    TABLE 1

    Specificity of radiologic findings in infants and toddlers19

    Rib fractures are highly suggestive of child abuse. Most abusive rib fractures result from anterior-posterior compression of the chest. For this reason, rib fractures are frequently found in infants who are held around the chest, squeezed, and shaken. Rib fractures have high probability of being caused by abuse.15,17,21 The positive predictive value of rib fractures for child abuse in children younger than 3 years was 95% in one retrospective study.22 Other less common causes of rib fractures in infants include significant trauma sustained during childbirth or a motor vehicle crash as well as minor trauma in infants who have increased bone fragility.23–25

    Cardiopulmonary resuscitation (CPR) has been proposed as a cause of rib fractures, but conventional CPR with 2 fingers of 1 hand rarely causes fractures in children.26,27 Recent recommendations that CPR be performed using 2 hands encircling the rib cage have raised concerns that this technique might cause rib fractures. An analysis of infants who were discovered during autopsy to have rib fractures and had received 2-handed chest compressions antemortem suggested that 2-handed CPR is associated with anterior-lateral rib fractures of the third to sixth ribs.28 In this small study, no posterior rib fractures were observed. The fractures in these infants were always multiple, uniformly involved the fourth rib, and were sometimes bilateral. Additional research is needed to examine the relationship between the 2-handed CPR technique and rib fractures.

    Classic metaphyseal lesions (CMLs) also have high specificity for child abuse when they occur during the first year of life.21,29 CMLs are the most common long bone fracture found in infants who die with evidence of inflicted injury.30 CMLs are planar fractures through the primary spongiosa of the metaphysis. These fractures are caused when torsional and tractional shearing strains are applied across the metaphysis, as may occur with vigorous pulling or twisting of an infant’s extremity.31 Fractures resembling CMLs radiographically have been reported after breech delivery32 and as a result of treatment of clubfoot.33

    Depending on the projection of the radiograph, CMLs can have the appearance of a corner or a bucket-handle fracture. Acute injuries can be difficult to visualize radiographically. CMLs commonly heal without subperiosteal new bone formation or marginal sclerosis. They can heal quickly and be undetectable on plain radiographs in 4 to 8 weeks.31

    Fractures With Moderate Specificity for Abuse

    Although many children who have been abused will have only a single fracture,34 the presence of multiple fractures, fractures of different ages and/or stages of healing, and complex skull fractures have moderate specificity for physical abuse. In addition, epiphyseal separations, vertebral body fractures, and digital fractures have moderate specificity for abuse. The presence of multiple fractures or fractures of different ages can be signs of bone fragility but should also evoke consideration of child abuse. Besides the predictive value of the particular pattern of fractures, many other factors, such as the history and the child’s age, must be considered when determining whether the injury was inflicted.

    Common Fractures With Low Specificity for Child Abuse

    Long bone fractures (other than CMLs), linear skull fractures, clavicle fractures, and isolated findings of subperiosteal new bone formation have low specificity for child abuse. In contrast, the single long bone diaphyseal fracture is the most common fracture pattern identified in abused children.1,13,34

    An understanding of the extent and type of load that is necessary to cause a particular long bone fracture can help to determine whether a specific fracture is consistent with the injury described by the caregiver.35,36 Transverse fractures of the long bones are caused by the application of a bending load in a direction that is perpendicular to the bone, whereas spiral fractures are caused by torsion or twisting of a long bone along its long axis. Oblique fractures are caused by a combination of bending and torsion loads.37 Torus or buckle fractures are the result of compression from axial loading along the length of the bone. Although earlier studies suggested that spiral fractures should always raise suspicion for child abuse,12 more recent studies do not show that any particular fracture pattern can distinguish between abuse and nonabuse with absolute certainty.16,38

    Falls are common in childhood.39 Short falls can cause fractures, but they rarely result in additional significant injury (eg, neurologic injury).11,40–42 In a retrospective study of short falls, parents reported that 40% of the children before 2 years of age had suffered at least 1 fall from a height of between 6 inches and 4 feet. Approximately one-quarter of these children suffered an injury; bruises were the most common injury observed.43

    The femur, humerus, and tibia are the most common long bones to be injured by child abuse.1,34 Femoral fractures in the nonambulatory child are more likely caused by child abuse, whereas these fractures in ambulatory children are most commonly noninflicted.10,16,43–45

    Certain femur fractures may occur as a result of a noninflicted injury in young children. Several studies have demonstrated that a short fall to the knee may produce a torus or impacted transverse fracture of the distal femoral metadiaphysis.46,47 Oblique distal femur metaphyseal fractures have been reported in children playing in a stationary activity center, such as an Exersaucer (Evenflo, Picqua, OH).48

    In both ambulatory and nonambulatory children, under some circumstances, falls on a stairway can cause a spiral femoral fracture. For example, a fall down several steps and landing with 1 leg folded or twisted underneath a child can lead to excessive torsional loading of the femur and a spiral fracture.46 In ambulatory children, noninflicted femoral fractures have been described in children who fell while running or who fell and landed in a split-leg position.43

    A fracture of the humeral shaft in a child younger than 18 months has a high likelihood of having been caused by abuse.15,49,50 In contrast, supracondylar fractures in ambulatory children are usually noninflicted injuries resulting from short falls.15

    Physicians should also be aware of a particular mechanism reported to produce a noninflicted spiral-oblique fracture of the humerus in 1 case report.51 When the young infant was rolled from the prone position to the supine while the child’s arm is extended, the torsion and stress placed on the extended arm appeared to cause a spiral-oblique fracture of the midshaft of the humerus.

    Linear skull fractures of the parietal bone are the most common skull fracture among young children, usually children younger than 1 year.13 A short fall from several feet onto a hard surface can cause a linear, nondiastatic skull fracture.19,52 The majority of linear skull fractures are not inflicted.53 By contrast, complex or bilateral skull fractures are typical of nonaccidental trauma.

    Syndromes, Metabolic Disorders, Systemic Disease

    Preexisting medical conditions and bone disease may make a child’s bones more vulnerable to fracture. Some conditions may manifest skeletal changes, such as metaphyseal irregularity and subperiosteal new bone formation. These entities should be considered in the differential diagnosis of childhood fractures.

    Osteogenesis Imperfecta

    Osteogenesis imperfecta (OI) is a heterogeneous family of diseases, usually caused by heterozygous mutations of the genes COL1A1 and COL1A2,54 but mutations in these and other genes can cause autosomal recessive forms of OI. The COL1A1 and COL1A2 genes encode the chains of type I collagen, which forms the structural framework of bone. Although it is a genetic disorder, many children have de novo mutations or autosomal-recessive disease and no family history of bone fragility. In addition, the presentation of the disease within affected members of the same family can be quite variable. Phenotypic expression of the disease depends on the nature of the mutation, its relative abundance attributable to mosaicism, and its expression in target tissues.55 Some types of OI involve reduced production of collagen, and the symptoms resolve or lessen after puberty.56 Table 2 lists the various signs and symptoms that can be present in a case of OI.

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    TABLE 2

    Characteristics of Osteogenesis Imperfecta

    The diagnosis of OI is often suggested by a family history of fractures, short stature, blue sclera, poor dentition, and radiographic evidence of low bone density or osteopenia. The fractures are most commonly transverse in nature, occurring in the shafts of the long bones. It is unusual to have multiple long bone fractures or rib fractures, particularly in infancy, without other clinical and radiographic evidence of OI.57,58

    OI has been misdiagnosed as child abuse.59 On the other hand, OI is often suggested as the cause of fractures in children who have been abused. If fractures continue to occur when a child is placed in a protective environment, a more thorough evaluation for an underlying bone disease is needed. Child abuse is more common than OI,60 and children with OI and other metabolic or genetic conditions may also be abused.61,62

    Preterm Birth

    Preterm infants have decreased bone mineralization at birth, but after the first year of life, bone density normalizes.63,64 Osteopenia of prematurity has been well described as a complication in low birth weight infants.65 Infants born at less than 28 weeks’ gestation or who weigh less than 1500 g at birth are particularly vulnerable. Osteopenia of prematurity is multifactorial. Infants are also at risk if they receive prolonged (for 4 or more weeks) total parenteral nutrition, have bronchopulmonary dysplasia, and/or have received a prolonged course of diuretics or steroids.66 Osteopenia commonly presents between 6 and 12 weeks of life. Osteopenia of prematurity can be ameliorated if infants are monitored closely and receive the nutritional and mineral supplementation initiated in the NICU.

    Fractures associated with osteopenia of prematurity usually occur in the first year of life.67 Rib fractures are typically encountered incidentally, whereas long bone fractures commonly present with swelling of the extremity. Osteopenia of prematurity can be associated with rickets, and in such cases, metaphyseal irregularities may be present. Although osteopenia of prematurity may make the infant more vulnerable to fracture, preterm infants are also at an increased risk of abuse.68

    Vitamin D Deficiency Rickets

    Suboptimal vitamin D concentrations and rickets have been proposed as causes of fractures in infants.69 Vitamin D insufficiency in otherwise healthy infants and toddlers is common. Approximately 40% of infants and toddlers aged 8 to 24 months in an urban clinic had laboratory evidence of vitamin D insufficiency (serum concentrations of 25-hydroxyvitamin D of ≤30 ng/mL).70 Prolonged breastfeeding without vitamin D supplementation was a critical factor that placed these infants at risk, although increased skin pigmentation and/or lack of sunlight exposure may also have contributed. Rickets is characterized by demineralization, loss of the zone of provisional calcification, widening and irregularity of the physis, and fraying and cupping of the metaphysis.71 Despite the high prevalence of vitamin D insufficiency in infants and toddlers, rickets is uncommon.72

    The claim that vitamin D deficiency or insufficiency causes skeletal lesions that lead to the incorrect diagnosis of child abuse in infants is not supported in the literature. A systematic clinical, laboratory, and radiologic assessment should exclude that possibility.73–75 Schilling et al found no difference in serum concentrations of 25-hydroxyvitamin D in young children with fractures suspicious for abuse and noninflicted fractures.76 Vitamin D insufficiency was not associated with multiple fractures, in particular rib fractures or CMLs, the high specificity indicators of abuse. Perez-Rossello et al studied radiographs of 40 healthy older infants and toddlers with vitamin D insufficiency and deficiency and concluded that radiographic rachitic changes were uncommon and very mild. In this population, the reported fracture prevalence was zero.72

    In a study of 45 young children with radiographic evidence of rickets, investigators found that fractures occurred only in those infants and toddlers who were mobile.77 Fractures were seen in 17.5% of the children, and these children were 8 to 19 months of age. The fractures involved long bones, anterior-lateral and lateral ribs, and metatarsal and metaphyseal regions. The metaphyseal fractures occurred closer to the diaphysis in the background of florid metaphyseal rachitic changes and did not resemble the juxtaphyseal corner or bucket handle pattern of the CML. In infant fatalities in which abuse is suspected, rachitic changes appear to be rare histologically.78

    Osteomyelitis

    Osteomyelitis in infants can present as multiple metaphyseal irregularities potentially resembling CMLs.79 Typically, the lesions become progressively lytic and sclerotic with substantial subperiosteal new bone formation. Other signs of infection are often present, such as fever, increased erythrocyte sedimentation rate, elevated C-reactive protein concentration, and elevated white blood cell count.

    Fractures Secondary to Demineralization From Disuse

    Any child with a severe disability that limits or prevents ambulation can be at risk for fractures secondary to disuse demineralization, even with normal handling.80,81 The fractures are usually diaphyseal rather than CMLs. Often, these fractures occur during physical therapy and range-of-motion exercises. It can be difficult to distinguish between inflicted and noninflicted fractures occurring in these children. At the same time, children with disabilities are at an increased risk of being maltreated.82–84 When multiple or recurrent fractures occur in a disabled child, a trial change in caregivers may be indicated to determine whether the fractures can be prevented. This is an extreme intervention and should be reserved for unusual circumstances.63

    Scurvy

    Scurvy is caused by insufficient intake of vitamin C, which is important for the synthesis of collagen. Although rare today because formula, human milk, fruits, and vegetables contain vitamin C, scurvy may develop in older infants and children given exclusively cow milk without vitamin supplementation and in children who eat no foods containing vitamin C.85–87 Although scurvy can result in metaphyseal changes similar to those seen with child abuse, other characteristic bone changes, including osteopenia, increased sclerosis of the zones of provisional calcification, dense epiphyseal rings, and extensive calcification of subperiosteal and soft tissue hemorrhages, will point to the diagnosis of scurvy.

    Copper Deficiency

    Copper plays a role in cartilage formation. Copper deficiency is a rare condition that may be complicated by bone fractures. Preterm infants are born with lower stores of copper than term infants, because copper is accumulated at a faster rate during the last trimester.88 Copper insufficiency may be observed in children with severe nutritional disorders, for example, liver failure or short gut syndrome.89 This deficiency is not likely to be observed in full-term children younger than 6 months of age or preterm infants younger than 2.5 months of age, because fetal copper stores are sufficient for this length of time. In addition, human milk and formula contain sufficient copper to prevent deficiency. Psychomotor retardation, hypotonia, hypopigmentation, pallor, and a sideroblastic anemia are some of the characteristic findings of copper deficiency in infants. Radiologic changes that should lead to further evaluation for possible deficiency include cupping and fraying of the metaphyses, sickle-shaped metaphyseal spurs, significant demineralization, and subperiosteal new bone formation.

    Menkes Disease

    Menkes disease, also known as Menkes kinky hair syndrome, is a rare congenital defect of copper metabolism.90 Menkes disease is an X-linked recessive condition and occurs only in boys. Although it has many of the features of dietary copper deficiency, anemia is not associated with Menkes disease. Metaphyseal fragmentation and subperiosteal new bone formation may be observed on radiographs, and the findings may be difficult to distinguish from fractures caused by abuse.91 Other signs of Menkes disease include sparse, kinky hair, calvarial wormian bones, anterior rib flaring, failure to thrive, and developmental delay. A characteristic finding is tortuous cerebral vessels. Intracranial hemorrhage can occur in Menkes disease but has not been reported in infants with copper deficiency.

    Systemic Disease

    Chronic renal disease affects bone metabolism because children with chronic renal disease may develop a metabolic acidosis that interferes with vitamin D metabolism. Chronic renal disease can cause renal osteodystrophy resulting in the same radiographic changes as nutritional rickets. Because chronic liver disease (eg, biliary atresia) interferes with vitamin D metabolism, such children may be at an increased risk of fractures. Fanconi syndrome, hypophosphatasia, hypophosphatemic (vitamin D resistant) rickets, hyperparathyroidism, and renal tubular acidosis also cause clinical variants of rickets.

    Temporary Brittle Bone Disease Hypothesis

    Physicians should be aware of alternative diagnoses that are unsupported by research but are sometimes suggested when an infant has unexplained fractures. In 1993, Paterson proposed that some infants may be born with bones that are temporarily more fragile or vulnerable to fracture in the context of normal handling, which he called “temporary brittle bone disease.”92 Paterson suggested that some trace element deficiency, such as copper or a transient collagen immaturity, caused the disease but provided no scientific data that confirmed his hypotheses and offered no specific test that confirmed temporary brittle bone disease.61 Subsequent studies did not support his hypotheses, and his case analysis has been refuted.57,93–95

    Miller hypothesized that temporary brittle bone disease is a result of fetal immobilization or intrauterine confinement that leads to transient bone loss or osteopenia.96,97 In support of his hypothesis, he reported that 95% of 21 infants with multiple unexplained fractures had decreased fetal movements, according to their mothers.97,98 Although he used bone densitometry in each patient as a basis for his conclusions, none of the patients had had bone densitometry performed at the time of the fracture. The testing was performed 8 to 21 weeks later, and no infants were tested before 5 months of age. In addition, bone densitometry standards have not been established for infants. He relied on the mother’s history of decreased fetal movements and provided no independent measurements of those movements. Palacios and Rodriguez found no evidence that oligohydramnios affects bone mass of the fetus, probably because fetal movement is only restricted in the last trimester of pregnancy by oligohydramnios and because the mechanical loading on the bones stimulating bone formation is conserved.99

    Medical Evaluation

    History of Present Illness

    It is essential to obtain a detailed history to determine how an injury occurred. If an injury in a nonverbal child was witnessed, the caregiver should be able to provide details about the child’s activity and position before an injury and the child’s final position and location after the injury occurred.46 Verbal children with concerning fractures should be interviewed apart from caregivers and ideally by a professional who is skilled in forensic interviewing.

    A comparison of the histories provided by caregivers of children with noninflicted femoral fractures and by caregivers of children whose injuries were caused by abuse is instructive. When an injury was caused by abuse, the caregiver provided either no history of an injury or related a history of a low-energy event. By contrast, 29% of the caregivers of children with noninflicted injuries provided some high-energy explanation, such as a motor vehicle collision or that the child fell from a height.16 Most of the low-energy mechanisms provided for the noninflicted injuries involved falls including stair falls and siblings landing on the femur during play.16,46

    The child’s response to the event may also provide important clues about the etiology. The majority of children with long bone fractures will have some swelling, pain, or other signs, such as decreased use of the extremity, suggesting a fracture.100,101 Some children, however, will have minimal external signs of injury.102 The absence of any history of injury, a vague description of the event, a delay in seeking care, the absence of an explanation for an injury particularly in a nonambulatory child, or an inconsistent explanation should increase the physician’s concern that an injury was caused by child abuse (see Table 3).13,16

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    TABLE 3

    When Is a Fracture Suspicious for Child Abuse?

    Past Medical History

    The past medical history is important and should include details about the mother’s pregnancy. If the child was born preterm, the infant’s bone mineral content may be reduced, and the infant may be at risk for fracture. A history of total parental nutrition, hepatobiliary disease, diuretic therapy, hypercalciuria, or corticosteroids may make the bones of a low birth weight infant even more vulnerable to fracture. In addition, chronic diseases, such as renal insufficiency or metabolic acidosis, malabsorption, cerebral palsy or other neuromuscular disorders, genetic diseases that affect skeletal development, or any illness that limits mobility, may affect bone strength. A thorough dietary history and history of medications that can predispose to fractures are important. The physician should inquire about previous injuries including bruises and determine the child’s developmental abilities, because children who are not yet mobile are much more likely to have fractures caused by abuse.

    Family History

    A family history of multiple fractures, early-onset hearing loss, abnormally developed dentition, blue sclera, and short stature should suggest the possibility of OI.

    Social History

    The physician should obtain a complete psychosocial history, including asking who lives in the home and who has provided care for the child. The history should inquire about intimate partner violence, substance abuse including drugs and alcohol, mental illness, and previous involvement with child protective services and/or law enforcement.

    Physical Examination

    The child should have a comprehensive physical examination, and the growth chart should be carefully reviewed. Abnormal weight may suggest neglect or endocrine or metabolic disorders. Any signs or symptoms of fractures, such as swelling, limitation of motion, and point tenderness should be documented. The physician should do a complete skin examination to look for bruises and other skin findings because bruises are the most common injury caused by child abuse. The majority of children with fractures do not have bruising associated with the fracture; the presence or absence of such bruising does not help to determine which fractures are caused by child abuse.103,104 Bruising in a child who is not yet cruising or bruising in unusual locations, such as the ears, neck, or trunk should raise suspicion for child abuse.105,106 The child should be examined for other injuries caused by child abuse, in addition to signs of other medical conditions associated with bone fragility. Blue sclerae are seen in certain types of OI. Sparse, kinky hair is associated with Menkes disease. Dentinogenesis imperfecta is occasionally identified in older children with OI.

    Laboratory Evaluation

    The clinical evaluation should guide the laboratory evaluation. In children with fractures suspicious for abuse, serum calcium, phosphorus, and alkaline phosphatase should be reviewed, although alkaline phosphatase may be elevated with healing fractures. The physician should consider checking serum concentrations of parathyroid hormone and 25-hydroxyvitamin D, as well as urinary calcium excretion (eg, random urinary calcium/creatinine ratio) in all young children with fractures concerning for abuse, but these levels should certainly be assessed if there is radiographic evidence of osteopenia or metabolic bone disease. Screening for abdominal trauma with liver function studies as well as amylase and lipase concentration should be performed when severe or multiple injuries are identified. A urinalysis should be performed to screen for occult blood. Serum copper, vitamin C, and ceruloplasmin concentrations should be considered if the child is at risk for scurvy or copper deficiency and has radiographic findings that include metaphyseal abnormalities.

    If OI is suspected, sequence analysis of the COL1A1 and COL1A2 genes that are associated with 90% of cases of OI as well as other genes associated with less common autosomal-recessive forms of OI may be more sensitive than biochemical tests of type I collagen and may identify the mutation to guide testing of other family members.107 Some of the less common forms of OI are OI types IIB and VII, CRTAP; OI type VI, FKBP10; OI type VIII, LEPRE1; OI type IX, PPIB; OI type X, SERPINH1; OI type XI, SP7; OI type XII, SERPINF1; and OI type XIII, BMP1. DNA sequencing can be performed using genomic DNA isolated from peripheral blood mononuclear cells or even saliva, whereas the biochemical analysis of type I collagen requires a skin biopsy. Doing both DNA analysis and skin biopsy is not indicated in most cases. Consultation with a pediatric geneticist may be helpful in deciding which children to test and which test to order.108

    Imaging Approach

    Children younger than 2 years with fractures suspicious for child abuse should have a radiographic skeletal survey to look for other bone injuries or osseous abnormalities.109 Additional fractures are identified in approximately 10% of skeletal surveys, with higher yields in infants.110 Skeletal surveys may be appropriate in some children between ages 2 and 5 years, depending on the clinical suspicion of abuse. If specific clinical findings indicate an injury at a particular site, imaging of that area should be obtained regardless of the child’s age.

    The American College of Radiology has developed specific practice guidelines for skeletal surveys in children.111 Twenty-one images are obtained, including frontal images of the appendicular skeleton, frontal and lateral views of the axial skeleton, and oblique views of the chest. Oblique views of the chest have been shown to increase the sensitivity, specificity, and accuracy of the identification of rib fractures.112 A full 4 skull series should be obtained if there are concerns of head injury. Computed tomography (CT) 3-dimensional models are valuable adjuncts to the radiographs and have the potential to replace the skull series.113 This has not been studied systematically in this context, however. Because lateral views of the extremities increase yield, some authors suggest that these views be included in the imaging protocol.114 Fractures may be missed if the guidelines are not followed or if the images are of poor quality.115 A repeat skeletal survey should be performed approximately 2 to 3 weeks after the initial skeletal survey if child abuse is strongly suspected.109,116 The follow-up examination may identify fractures not seen on the initial skeletal survey, can clarify uncertain findings identified by the initial skeletal survey, and improves both sensitivity and specificity of the skeletal survey.116,117 In one study, 13 of 19 fractures found on the follow-up examination were not seen on the initial series.116 The number of images on the follow-up examination may be limited to 15 views by omitting the views of the skull, pelvis, and lateral spine.118

    Radiography may assist in assessing the approximate time when an injury occurred because long bone fractures heal following a particular sequence.119 If the healing pattern is not consistent with the explanation provided, the accuracy of the explanation should be questioned.

    Bone scintigraphy may be used to complement the skeletal survey but should not be the sole method of identifying fractures in infants. Although it has high overall sensitivity, it lacks specificity for fracture detection and may fail to identify CMLs and skull fractures.109,119,120 Scintigraphy does have high sensitivity for identifying rib fractures, which can be difficult to detect before healing. In toddlers and older children, the use of bone scintigraphy or skeletal survey depends on the specific clinical indicators of abuse.109

    Because brain injuries are often occult, head imaging should be considered for any child younger than 1 year with a fracture suspicious for abuse.121 Imaging studies may help clarify whether the child has been abused, provide further support for a diagnosis of child abuse, and identify other injuries that require treatment. Additional imaging may be needed if the child has signs or symptoms of chest, abdominal, or neck injury.

    Chest CT can identify rib fractures that are not seen on chest radiographs.122 CT is particularly useful in detecting anterior rib fractures and rib fractures at all stages of healing—early subacute, subacute, and old fractures. Although CT may be more sensitive in identifying these injuries, a chest CT exposes the child to significantly more radiation than chest radiography. Every effort should be made to reduce children’s exposure to radiation while at the same time considering the risk to the child if abuse is not identified.123 Therefore, selective application of this technique in certain clinical settings is appropriate.

    Other modalities may become available in the future that will provide more accurate identification of skeletal injuries. Whole-body short tau inverse recovery imaging, a magnetic resonance imaging (MRI) technique, may identify rib fractures not recognized on the radiographic skeletal survey.124 In a study of 21 infants with suspected abuse, whole-body MRI at 1.5-Tesla was insensitive in the detection of CMLs and rib fractures. In some cases, whole-body MRI identified soft tissue edema and joint effusions that led to the identification of skeletal injuries with additional radiographs.125 Bone scintigraphy with 18F-sodium fluoride positron emission tomography (18F-NaF PET) bone scan may be useful in cases of equivocal or negative skeletal surveys when there is high clinical suspicion of abuse. If available, a 18F-NaF positron emission tomography bone scan has better contrast and spatial resolution than 99mTc-labeled methylene diphosphonate.120

    Although bone densitometry by dual-energy x-ray absorptiometry is useful to predict bone fragility and fracture risk in older adults, interpretation of bone densitometry in children and adolescents is more problematic.126 In adults, bone densitometry is interpreted using T scores, which describe the number of SDs above or below the average peak bone mass for a gender- and race-adjusted reference group of normal subjects. Because peak bone mass is not achieved until approximately 30 years of age, in children, z scores must be used to express bone density, because z scores express the child’s bone mineral density as a function of SDs above or below the average for an age- and gender-matched norm control population.127 In addition, because bone size influences dual-energy x-ray absorptiometry, z scores must also be adjusted for height z scores.128 The International Society for Clinical Densitometry recommends that the diagnosis of osteoporosis in childhood should not be made on the basis of low bone mass alone but should also include a clinically significant history of low-impact fracture. The recommendations currently apply to children 5 years and older, although reference data are available for children as young as 3 years.129,130 Unfortunately, there are limited reference data for the young, nonverbal child who is most at risk for suffering fractures caused by child abuse.

    Evaluation of Siblings

    Siblings, especially twins, and other young household members of children who have been physically abused should be evaluated for maltreatment.131 In a study of 795 siblings in 400 households of a child who had been abused or neglected, all siblings in 37% of households and some siblings in 20% of households had suffered some form of maltreatment.132 In this study, which included all manifestations of maltreatment, siblings were found to be more at risk for maltreatment if the index child suffered moderate or severe maltreatment. In addition to a careful evaluation, imaging should be considered for any siblings younger than 2 years, especially if there are signs of abuse.

    Diagnosis

    When evaluating a child with a fracture, physicians must take a careful history of any injury event and then determine whether the mechanism described and the severity and timing are consistent with the injury identified (see Table 3).133 They must consider and evaluate for possible diagnoses in addition to other signs or symptoms of child abuse. A careful evaluation for other injuries is important because the presence of additional injuries that are associated with child abuse increases the likelihood that a particular fracture was inflicted.16,43 It is important to remember that even if a child has an underlying disorder or disability that could increase the likelihood of a fracture, the child may also have been abused because children with disabilities and other special health care needs are at increased risk of child abuse.83,84 Physicians should keep an open mind to the possibility of abuse and remember that child abuse occurs in all socioeconomic groups and across all racial and ethnic groups. Many of these diagnoses are complex. If a physician is uncertain about how to evaluate an injury or if they should suspect a fracture was caused by child abuse, they should consult a child abuse pediatrician or multidisciplinary child abuse team to assist in the evaluation, particularly if the child is nonambulatory or younger than 1 year of age.134 In certain circumstances, the physician will need to consult an orthopedist, endocrinologist, geneticist, or other subspecialists.

    All US states, commonwealths, and territories have mandatory reporting requirements for physicians and other health care providers when child abuse is suspected. Physicians should be aware of and comply with the reporting requirements of their state. Typically, the standard for making a report is when the reporter “suspects” or “has reason to believe” that a child has been abused or neglected. Sometimes determining whether that “reasonable belief” or “reasonable suspicion” standard has been met can be nuanced and complex. The physician should keep in mind that incontrovertible proof of abuse or neglect is not required by state statutes, and there may be cases in which it is reasonable to consult with a child abuse pediatrician about whether a report should be made.

    Lead Author

    Emalee G. Flaherty, MD, FAAP

    Committee on Child Abuse and Neglect, 2012–2013

    Cindy W. Christian, MD, FAAP, Chairperson

    James E. Crawford-Jakubiak, MD, FAAP

    Emalee G. Flaherty, MD, FAAP

    John M. Leventhal, MD, FAAP

    James L. Lukefahr, MD, FAAP

    Robert D. Sege MD, PhD, FAAP

    Liaisons

    Harriet MacMillan, MD – American Academy of Child and Adolescent Psychiatry

    Catherine M. Nolan, MSW, ACSW – Administration for Children, Youth, and Families

    Linda Anne Valley, PhD – Centers for Disease Control and Prevention

    Staff

    Tammy Piazza Hurley

    Section on Radiology Executive Committee, 2012–2013

    Christopher I. Cassady, MD, FAAP, Chairperson

    Dorothy I. Bulas, MD, FAAP

    John A. Cassese, MD, FAAP

    Amy R. Mehollin-Ray, MD, FAAP

    Maria-Gisela Mercado-Deane, MD, FAAP

    Sarah Sarvis Milla, MD, FAAP

    Staff

    Vivian Thorne

    Section on Endocrinology Executive Committee, 2012–2103

    Irene N. Sills, MD, FAAP, Chairperson

    Clifford A. Bloch, MD, FAAP

    Samuel J. Casella, MD, MSc, FAAP

    Joyce M. Lee, MD, FAAP

    Jane Lockwood Lynch, MD, FAAP

    Kupper A. Wintergerst, MD, FAAP

    Staff

    Laura Laskosz, MPH

    Section on Orthopedics Executive Committee, 2012–2013

    Richard M. Schwend, MD, FAAP, Chairperson

    J. Eric Gordon, MD, FAAP

    Norman Y. Otsuka, MD, FAAP

    Ellen M. Raney, MD, FAAP

    Brian A. Shaw, MD, FAAP

    Brian G. Smith, MD, FAAP

    Lawrence Wells, MD, FAAP

    Paul W. Esposito, MD, USBJD Liaison

    Staff

    Niccole Alexander, MPP

    Footnotes

    • This document is copyrighted and is property of the American Academy of Pediatrics and its Board of Directors. All authors have filed conflict of interest statements with the American Academy of Pediatrics. Any conflicts have been resolved through a process approved by the Board of Directors. The American Academy of Pediatrics has neither solicited nor accepted any commercial involvement in the development of the content of this publication.

    • The guidance in this report does not indicate an exclusive course of treatment or serve as a standard of medical care. Variations, taking into account individual circumstances, may be appropriate.

    • All clinical reports from the American Academy of Pediatrics automatically expire 5 years after publication unless reaffirmed, revised, or retired at or before that time.

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    Evaluating Children With Fractures for Child Physical Abuse
    Emalee G. Flaherty, Jeannette M. Perez-Rossello, Michael A. Levine, William L. Hennrikus, and the AMERICAN ACADEMY OF PEDIATRICS COMMITTEE ON CHILD ABUSE AND NEGLECT, SECTION ON RADIOLOGY, SECTION ON ENDOCRINOLOGY, SECTION ON ORTHOPAEDICS, the SOCIETY FOR PEDIATRIC RADIOLOGY
    Pediatrics Feb 2014, 133 (2) e477-e489; DOI: 10.1542/peds.2013-3793

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    Evaluating Children With Fractures for Child Physical Abuse
    Emalee G. Flaherty, Jeannette M. Perez-Rossello, Michael A. Levine, William L. Hennrikus, and the AMERICAN ACADEMY OF PEDIATRICS COMMITTEE ON CHILD ABUSE AND NEGLECT, SECTION ON RADIOLOGY, SECTION ON ENDOCRINOLOGY, SECTION ON ORTHOPAEDICS, the SOCIETY FOR PEDIATRIC RADIOLOGY
    Pediatrics Feb 2014, 133 (2) e477-e489; DOI: 10.1542/peds.2013-3793
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      • Introduction
      • Differential Diagnosis of Fractures
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      • Committee on Child Abuse and Neglect, 2012–2013
      • Liaisons
      • Staff
      • Section on Radiology Executive Committee, 2012–2013
      • Staff
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    • Case 3: Skull Depression in a 9-month-old Girl
    • Imaging and Diagnosis of Physical Child Abuse
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    • Critical Elements in the Medical Evaluation of Suspected Child Physical Abuse
    • Risk factors for long-bone fractures in children up to 5 years of age: a nested case-control study
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