Abstract
1. Thirteen cases of traumatic separation of the upper femoral epiphysis have been studied. Four were previously reported and nine new cases are analysed.
2. This is a rare injury occurring in young children and is due to severe violence.
3. Separation occurred at the epiphysial plate, and severe posterior displacement was frequent. The fracture line does not penetrate the epiphysis.
4. Premature fusion, avascular necrosis or non-union (individually or together) occurred in eleven of the thirteen patients.
5. Separation of the upper femoral epiphysis is a serious injury which is likely to lead to permanent deformity.
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