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Retired NBME Step 2 CK Form 8 Answers

step2ck_form8/Block 3/Question#24 (reveal difficulty score)
An obese 14-year-old boy is brought to the ...
Pin fixation 🔍 / 📺 / 🌳 / 📖
tags: msk

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  • Obese adolescent who presents with atraumatic, afebrile groin pain and a limp with decreased range of motion and imaging showing displacement of the femoral head from the growth plate, most consistent with a slipped capital femoral epiphysis (SCFE) which is treated with pin fixation to avoid avascular necrosis
  • Key idea: Hip problems (osteoarthritis, avascular necrosis of the femoral head, etc.) often lead to groin symptoms
  • 2 common causes of avascular necrosis in child: (1) Legg-Calve Perthes disease: Commonly seen in males between 5-7 years old, X-ray often NORMAL, Idiopathic (2) SCFE: Commonly seen in obese ~12 year old child, Diagnosed via abnormal x-ray, Caused by epiphysis displacing relative to femoral neck and needs to be corrected surgically

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