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Review Question - QID 3585

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QID 3585 (Type "3585" in App Search)
A 2-year-old boy is seen for evaluation of a limp. His history is significant for a left knee infection treated with IV antibiotics as a neonate and a family history of cancer. Laboratory testing demonstrates a normal ESR and CRP. The remainder of his workup is negative. An AP pelvis is seen in Figure A. What was the most likely etiology of his condition?
  • A

Untreated neonatal hip infection

91%

3074/3378

Chondrosarcoma

1%

38/3378

Legg-Calve-Perthes disease

6%

205/3378

Slipped capital femoral epiphysis

0%

11/3378

Osteosarcoma

1%

28/3378

  • A

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The clinical scenario and images are consistent with a neglected pediatric septic hip. The AP pelvis in Figure A shows an absent left femoral head due to an untreated infection. Failure to diagnose an infected adjacent joint can lead to joint destruction and physeal damage with resultant deformity. Surgical options for hip deformity following a neglected infection include trochanteric osteotomy, proximal femoral varus osteotomy, and a modified Albee arthroplasy.

McCarthy at al reviewed the pediatric musculoskeletal infection principles and treatments in their Instructional Course Lecture. Prevention, prompt and accurate diagnosis, and timely intervention are needed to prevent late sequelae such as limb-length inequalities and angular deformities. Proper diagnosis includes evaluating adjacent joints of neonatal infections.

Peters et al reviewed the results of septic arthritis and physeal damage on overall growth. Growth plate arrest in the distal femur, proximal femur and proximal humerus accounted for angular deformities in neonates with prior joint infections. They recommended continued long-term growth monitoring of infected patients until age 9.

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