The disorder is typically seen in the adolescent age group.
May present with an acute/insidious onset of pain and limp.
Associated systemic disease is a common feature.
Obligatory external rotation on hip flexion is a key examination finding.
Recommended surgical treatment is in situ pinning; prophylactic fixation of the contralateral hip may be necessary when concomitant metabolic disease is present.
Slipped capital femoral epiphysis (SCFE) is the most common hip disorder in the adolescent age group. It occurs when weakness in the proximal femoral growth plate allows displacement of the capital femoral epiphysis. SCFE is a misnomer; it is the metaphysis that displaces anteriorly and superiorly, leading to the slipped state.   Weakness in the growth plate can be caused by a variety of factors, including stress on the growth plate due to obesity, and endocrine disorders such as panhypopituitarism, hypothyroidism, and renal osteodystrophy. A period of rapid growth in adolescence may also weaken the epiphyseal plate.  Klein lines are drawn along the superior cortex of the femoral neck. Plain anteroposterior/frog-leg lateral radiographs show the Klein line not intersecting the femoral head in hips with SCFE. Valgus SCFE is defined as posterolateral slippage of the proximal femoral epiphysis on the metaphysis. 
Richard M. Armstrong Jr. Professor of Orthopaedic Surgery
Perelman School of Medicine
University of Pennsylvania
Chief of Orthopaedic Surgery
The Children's Hospital of Philadelphia
JMF declares that he has no competing interests.
Dr John M. Flynn would like to gratefully acknowledge Dr Purushottam A. Gholve, Dr Danielle B. Cameron, and Dr Patrick O'Toole, previous contributors to this monograph. Dr John M. Flynn would also like to gratefully acknowledge the assistance of Nicholas A. Beck. PAG, DBC, PO, and NAB declare that they have no competing interests.
Department of Orthopedics and Rehabilitation
University of Wisconsin School of Medicine and Public Health
JM declares that he has no competing interests.
Consultant Orthopaedic Surgeon and Honorary Lecturer
University Hospital of Wales
DPT declares that he has no competing interests.
Consultant Orthopaedic Surgeon
Developmental Origins of Health and Disease (DOHaD)
School of Medicine
University of Southampton
NMC has received honoraria for visiting professorships in North America and also for lectures in respect of congenital hip dysplasia. He is also a founding member of the International Hip Dysplasia Institute, which has received charitable funding.
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