Avulsion of the less trochanter.

After a period with prodromal pain a 13 year old, slightly adiposogenital-looking boy suffered from an avulsion of the lesser trochanter after a minior trauma. He was successfully treated with operative reduction and fixation. The aetiology of the lesion is discussed. On the basis of this case and others reported in the literature, the lesion may be due to separation in an epiphysis already suffering from a disorder.