Congenital dislocation of the knees associated with a partial chromosome I deletion.

Congenital dislocation of the knee is a rare disorder that has been reported previously in association with neuromuscular disorders and ligamentous laxity syndromes and is related to mechanical factors. Concurrent chromosomal abnormalities have not been reported previously with congenitally dislocated knees. The authors present a case of congenitally dislocated knees in a patient with an extremely rare and only recently described partial deletion of chromosome I. There have been three previously reported cases of this particular chromosomal deletion, none of which included dislocated joints.