Habitual dislocation of patella in knee disarticulation stump in a patient of congenital type I deficiency of tibia: a case report.

The objective of this case report was to describe a patient who developed habitual dislocation of patella after knee disarticulation. Congenital deficiency of the tibia (tibial hemimelia, aplasia or dysplasia) is very rare, with an incidence of approximately 1 per 1 million live births. Knee disarticulation is preferred over transfemoral amputation for type I tibial deficiency.