Acute knee joint rupture--a report of two unusual cases.

An acute rupture of the knee joint is a well recognized and documented condition. The symptoms and signs it produces have been described as the pseudothrombophlebitis syndrome and its importance in the differential diagnosis of calf pain is being increasingly recognized. We report two cases where the symptomatology has been unusual and stress the need for considering this condition in other atypical cases of leg pain which may not strictly conform in presentation to the pseudothrombophlebitis syndrome.