## Why Slipped Capital Femoral Epiphysis (SCFE) is right A broken Shenton line is a classic radiographic sign of SCFE, which occurs in adolescents (typically 12–16 years) with obesity. The slippage of the femoral head epiphysis relative to the femoral neck disrupts the smooth curve that normally runs from the inferior border of the femoral neck to the superior border of the obturator foramen. The clinical presentation—acute hip pain, flexion-adduction-internal rotation posture, and inability to bear weight in an obese adolescent—is pathognomonic for SCFE. (Maheshwari Orthopedics 10e; Sutton Radiology) ## Why each distractor is wrong - **Legg-Calvé-Perthes Disease**: While this childhood avascular necrosis of the femoral head can also cause a broken Shenton line, it typically presents in children aged 4–8 years (not adolescents), and the clinical presentation differs. LCPD is usually insidious and painless initially, whereas SCFE presents acutely with severe pain. - **Developmental Dysplasia of Hip (DDH)**: DDH is screened in infants and presents with an uncovered femoral head and abnormal hip morphology. It does not typically cause an acute Shenton line break in a 16-year-old and is detected much earlier in life. - **Femoral Neck Fracture**: Although femoral neck fracture can disrupt the Shenton line, the clinical scenario (obese adolescent, acute flexion-adduction-internal rotation posture) is far more consistent with SCFE. Femoral neck fractures typically follow high-energy trauma in this age group. **High-Yield:** A broken Shenton line in an obese adolescent with acute hip pain = SCFE until proven otherwise; confirm with frog-leg lateral view showing posterior displacement of femoral head epiphysis. [cite:Maheshwari Orthopedics 10e; Sutton Radiology]
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