One hundred forty eight complications in 135 cases of long bone fractures experienced during the period from May 1971 to December 1979, at the Chosun University Hospital and analysed its retrospectively. The results were obtained as follows. 1. The order of incidence of complications were as follows; infection (39.8%), delayed union(23.6%). malunion (13.5%), ankylosis of joint (12.2%). nonunion (8.1%) and peripheral nerve injury (2. 8%). 2. Of all 127 patients, 97 patients were male and 30 patients were female, and 72 patients (56.7%) were cauesd by traffic accidents. The sex ratio between male and female was 3.2: l. 3. The major complications were frequently associated with other fractures and dislocations, brain injuries. 4. Those of open, comminuted fracture and delayed transfer cases to the Orthopedic Surgeon were predisposing factors to development of the severe complication.