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Radiology of Child Abuse. Kristy Rollins, M-IV July 25, 2006 Radiology Clerkship. Age at injury. 85% less than 3 years old 69% less than 1 year old Median age = 7 months. Number of Fractures. 50% with single fracture 21% with 2 fractures 12% with 3 fractures
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Radiology of Child Abuse Kristy Rollins, M-IV July 25, 2006 Radiology Clerkship
Age at injury • 85% less than 3 years old • 69% less than 1 year old • Median age = 7 months
Number of Fractures • 50% with single fracture • 21% with 2 fractures • 12% with 3 fractures • 17% with more than 3 fractures
Most Common Location • Femur (35%) • Humerus (29%) • Skull (16%)
Most Common Long Bone Fracture • Transverse fracture (48%) • Spiral fracture (26%) • Avulsion fracture (16%) • Oblique fracture (10%)
Increased suspicion if . . . • Inconsistencies/discrepancies in story and injury • Unwitnessed injuries • Injuries blamed on siblings • Injuries inconsistent with patient’s developmental age • Injury inconsistent with mechanism given • On exam if areas in multiple areas of healing are noted.
Workup of suspected abuse • Evaluation for: • Characteristic skin lesions • Swelling/deformity • Bone tenderness • Reluctance to use an extremity • Retinal hemorrhages • Trauma to the genitals • Signs of neglect
Musculoskeletal Exam • Entire skin surface examined • Skeleton showed be examined for deformity • Check range of motion in all joints • Detailed neurological examination
Radiographic Evaluation • Plain films of all areas of questioned present and previous injury • Skeletal survey • Consider radionucleotide scan as alternate to skeletal survey • Ultrasonography: useful for costochondral injuries • DEXA scan: can be used to differentiate OI and abuse
Specific for Intentional Injury • Metaphyseal corner fractures • Posterior rib fractures • Fractures of sternum, scapula, or spinous processes • Multiple fractures in various stages of healing • Bilateral acute long bone fractures • Complex skull fractures
Less Specific for Intentional Injury • Isolated long bone fractures • Simple skull fractures • Clavicle fractures
Fracture healing & dating • Soft tissue changes • Usually apparent for several days • Due to inflammation • Periosteal bone formation • Detectable once calcified • Usually between days 7-14 after injury • Fracture gap widens • Necrotic bone resorbed • Peaks 2-3 weeks after injury
Fracture Healing & Dating (2) • Soft callus • From production/calcification of osteoid • Appears as an increase in density • Hard callus • Lamellar bone bridges the fracture site • 1 week after soft callus • Usually completed healing at 3-6 weeks
Metaphyseal corner fracture http://rad.usuhs.mil/rad/home/peds/frank4arrow.jpg
Metaphyseal corner fracture (2) http://rad.usuhs.mil/rad/home/peds/specmet.jpg
Metaphyseal Corner Fracture (3) http://www.meddean.luc.edu/lumen/meded/Radio/curriculum/Pediatrics/Corner%20Fx%20characteristic%20of%20abuse.jpg
Posterior rib fractures http://www.meddean.luc.edu/lumen/meded/Radio/curriculum/Pediatrics/Arrowed%20rib%20fractures.jpg
Posterior Rib fracture (2) http://rad.usuhs.mil/rad/home/peds/ribfxoldarrow.jpg
Complex Skull Fracture http://rad.usuhs.mil/rad/home/peds/eggshellarrow.html
Multiple fractures http://rad.usuhs.mil/rad/home/peds/bonescan.jpg