Slipped capital femoral epiphysis is a gradual (chronic) or, in a third ofcases, sudden (acute or chronic) displacement ofthe femoral head in relation to the femoral neck and shaft.2 The displacement occurs through the growth plate, which is thought to be weakened in susceptible adolescents. The typical age is 10-16 years, over one fifth of cases are bilateral, and more boys are affected than girls.' 3 The exact aetiology is unknown but one third of patients are obese and have hypogonadism.
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A 1986 study studied this question.