Adventitious bursae in below knee amputees. Case reports and a review of the literature.

Adventitious bursae are known to occur from repeated friction and pressure but rarely have been reported in adult amputees. Four cases of adventitious bursae are described, which were noted during the course of a follow-up study of below knee amputees. Two bursae resolved with modification of the socket or refabrication. One developed bursitis and drainage and a fourth persisted in a patient with systemic lupus erythematosus.