[Tibiofibular synostoses (author's transl)].

Report on two cases. The congenital form we explain by partial persistence of an early stage of embryonal development. The cartilage common to tibia and fibula has separated only incompletely during further growth. The postoperative form probably arises from a bridge-cellus which developed from relative instability of the ostetomy-area during bony union. This bridge-callus became during further growth a wide tibiofibular synostosis.