In the past, amputation has been the most common surgical treatment for osteogenic sarcoma of a bone of an extremity. Due to advances in adjuvant and neoadjuvant treatment, in diagnostic imaging, and in the surgical techniques for reconstruction of limbsalvage surgery for most patients who have osteogenic sarcoma, the most common highgrade sarcoma of bone, the limb-salvage surgery becomes popular. We studied a consecutive series of patients who had been treated at the Department of Orthopaedic Surgery of Severance Hospital from March 1985 to Febrary 1990. In all of 31 patients, high-grade osteogenic sarcoma had been proved by biopsy. 1. The 31 osteogenic sarcoma affected 16 male and 15 female patients, and most cases(77.4%) occurred in patients from ten through nineteen years of age. The most of primary lesion(80.6%) was located around the knee joint. 2. We performed eighteen amputations and thirteen limb-salvage operations and if the patients had been indicated, we performed five segmental resection and rotationplasties and two Tikhoff-Linberg operations. And we performed adjuvant chemotherapy in all patients and recently neoadjuvant or intra-arterial chemotherapy were performed especially in limb-salvage operations. 3. The patients in group III were not shorter in the survival period, not higher in the recurrence, metastasis, and complication rate, and not worse functionally than other groups. The segmental resection and rotationplasty and Tikhoff-Linberg operation would be recommended as one of the limb-salvage operation for the osteogenic sarcoma in the extremities.