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Emergency and Acute Medicine – Slipped Capital Femoral Epiphysis (SCFE)
Slipped capital femoral epiphysis (SCFE) is an orthopedic condition in which the femoral epiphysis slips posteriorly and inferiorly relative to the femoral neck through the growth plate. It is classified by severity based on the percentage of slip (mild <33%, moderate 33–50%, severe >50%), by duration (acute <3 weeks, chronic >3 weeks, or acute-on-chronic), and by stability (stable if the patient can bear weight, unstable if not). It most commonly affects adolescents, with peak incidence at 12–14 years in boys and 11–12 years in girls, and occurs more frequently in males. Bilateral involvement is common, occurring in up to 20% initially and progressing in many others. Atypical cases may be associated with endocrinopathies and have a higher risk of bilateral disease.
The condition arises due to increased shear forces across a weakened proximal femoral physis during adolescence. As the growth plate becomes more oblique, mechanical forces shift from compression to shear. Risk factors include obesity (most common), Down syndrome, and endocrine disorders such as hypothyroidism, growth hormone deficiency, and renal osteodystrophy.
Patients often present with vague, poorly localized pain in the hip, groin, thigh, or even the knee due to referred pain. Chronic cases typically have dull pain over weeks with a limp, while acute cases present with sudden severe pain, often after minor trauma. On examination, patients may have an externally rotated leg, limited internal rotation, abduction, and flexion of the hip. A key clinical sign is obligatory external rotation during passive hip flexion. Gait abnormalities may include an antalgic gait, Trendelenburg gait in moderate-to-severe cases, or a waddling gait if bilateral involvement is present.
Diagnosis is primarily made with imaging. Plain radiographs of both hips are essential, including anteroposterior and lateral views. Findings may include widening of the physis, a “slipped” appearance of the epiphysis, and the classic Klein line abnormality (a line along the superior femoral neck that fails to intersect the epiphysis). If diagnosis is unclear, labs such as CBC, ESR, CRP, and endocrine studies may help evaluate alternative diagnoses or underlying causes.
Differential diagnoses include Legg–Calvé–Perthes disease, septic arthritis, osteomyelitis, transient synovitis, fractures, and hernias. It is important to always examine the hip in children presenting with knee or thigh pain to avoid missing SCFE.
Management is urgent and focuses on preventing further slippage and complications. The patient must be made strictly non–weight-bearing, and the hip should be immobilized. No attempts at reduction should be made in the emergency setting due to the risk of avascular necrosis. Immediate orthopedic consultation is required, as definitive treatment is typically surgical fixation with a single cannulated screw.
All cases of SCFE require admission for orthopedic management, especially acute, unstable, or bilateral cases. There is no role for discharge or observation. Early diagnosis is critical, as delays can lead to permanent hip deformity, osteonecrosis, and long-term disability.
Key points include recognizing referred knee pain as a possible presentation, using Klein line on radiographs for detection, avoiding manipulation, and ensuring urgent orthopedic referral.
Slipped capital femoral epiphysis (SCFE) is an orthopedic condition in which the femoral epiphysis slips posteriorly and inferiorly relative to the femoral neck through the growth plate. It is classified by severity based on the percentage of slip (mild <33%, moderate 33–50%, severe >50%), by duration (acute <3 weeks, chronic >3 weeks, or acute-on-chronic), and by stability (stable if the patient can bear weight, unstable if not). It most commonly affects adolescents, with peak incidence at 12–14 years in boys and 11–12 years in girls, and occurs more frequently in males. Bilateral involvement is common, occurring in up to 20% initially and progressing in many others. Atypical cases may be associated with endocrinopathies and have a higher risk of bilateral disease.
The condition arises due to increased shear forces across a weakened proximal femoral physis during adolescence. As the growth plate becomes more oblique, mechanical forces shift from compression to shear. Risk factors include obesity (most common), Down syndrome, and endocrine disorders such as hypothyroidism, growth hormone deficiency, and renal osteodystrophy.
Patients often present with vague, poorly localized pain in the hip, groin, thigh, or even the knee due to referred pain. Chronic cases typically have dull pain over weeks with a limp, while acute cases present with sudden severe pain, often after minor trauma. On examination, patients may have an externally rotated leg, limited internal rotation, abduction, and flexion of the hip. A key clinical sign is obligatory external rotation during passive hip flexion. Gait abnormalities may include an antalgic gait, Trendelenburg gait in moderate-to-severe cases, or a waddling gait if bilateral involvement is present.
Diagnosis is primarily made with imaging. Plain radiographs of both hips are essential, including anteroposterior and lateral views. Findings may include widening of the physis, a “slipped” appearance of the epiphysis, and the classic Klein line abnormality (a line along the superior femoral neck that fails to intersect the epiphysis). If diagnosis is unclear, labs such as CBC, ESR, CRP, and endocrine studies may help evaluate alternative diagnoses or underlying causes.
Differential diagnoses include Legg–Calvé–Perthes disease, septic arthritis, osteomyelitis, transient synovitis, fractures, and hernias. It is important to always examine the hip in children presenting with knee or thigh pain to avoid missing SCFE.
Management is urgent and focuses on preventing further slippage and complications. The patient must be made strictly non–weight-bearing, and the hip should be immobilized. No attempts at reduction should be made in the emergency setting due to the risk of avascular necrosis. Immediate orthopedic consultation is required, as definitive treatment is typically surgical fixation with a single cannulated screw.
All cases of SCFE require admission for orthopedic management, especially acute, unstable, or bilateral cases. There is no role for discharge or observation. Early diagnosis is critical, as delays can lead to permanent hip deformity, osteonecrosis, and long-term disability.
Key points include recognizing referred knee pain as a possible presentation, using Klein line on radiographs for detection, avoiding manipulation, and ensuring urgent orthopedic referral.
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