It is well known that fractures around the knee joint are usually combined with ligament injuries but it is easy to miss the ligament injuries during the treatment of fractures. The invention of the MRI and the development of arthroscopic techniques has made it easy to diagnose and care for ligament injuries. Authors reviewed the patients who had fractures around the knee joint to evaluate the frequencies, types, treatments and the results of combined ligaments injuries. There were 57 cases with the fracture of the proximal tibia and fibula which could be follwed up at least one year: from January 1992 to June 1995. There were 19 cases (33%) which had combined ligament injuries. The ligament injuries were diagnosed by stress X-ray & MRI evaluation and confirmed by arthroscopic examination. Single lateral rim avulsion fracture of proximal tibia was the most common type of fractures (7 cases, 37%). There were 11 cases (57%) of combined injuries of anterior cruciate ligament and medial collateral ligament. It was the most common combined ligament injury. Except for one, eleven cases that were combined with lateral rim avulsion of proximal tibia had anterior cruciate ligament injury. There were ten cases (53%) of fibula head and neck fractures which were combined with ligament injuries. The total number of the injured ligament was 35 and the common rupture sites of the injured ligaments was the attachment site of femur (13 cases) and tibia (16 cases). There were seven meniscal injury cases (37%). The interval from injury to operation averaged 14.1 days because many cases were acute injuries. Primary repairs for ruptured ligament were done in 31 cases (88%) because of their attachment site injuries. There were no instabilities except one case which was treated with posterior cruciate ligament reconstruction using semitendinosus ligament. It had a grade I posterior instability at the last follow-up. Early diagnosis and proper treatment on the ruptured ligaments and the torn meniscus combined with proximal tibia and fibular fractures seem to be important for a good prognosis.