Any of the entire spectrum of bone tumors can involve the hip region where is the second most frequent site of bone tumors. And the treatment method is usually determined by the characteristics of the tumor and the aim of the treatment. The authors analyzed fifteen surgical cases(including a reoperation in a patient) of fourteen patients who were treated by endoprosthetic replacement after local excision of the lesion under the impression of bone tumor around hip from Jan. 1982 to June 1990. According to the final pathologic diagnosis, there were 8 cases of metastatic carcinoma, 3 cases of giant cell tumcr, 1 case of chondrosarcoma, 1 case of lymphoma, and 1 case of chronic osteomyelitis. Thirteen lesions involved the proximal portion of the femur and the remaining one involved the ilium. Replacement arthroplasty was performed with conventional THRA implant in 6 cases, with bipolar endoprosthesis in 2 cases, and with tumor prosthesis in 7 cases. As postoperative complications, there were 4 cases of anemia treated by oral iron preparations, 2 cases of dislocation reduced surgically, 3 cases of local recurrence of tumor and 2 cases of cup loosening. One of two dislocated cases also had deep vein thrombosis and sciatic nerve palsy. And after open reduction of the disloca- tion, wound infection developed in both cases. Eleven surgical cases were followed up more than 6 months and their functional results were assessed by the Ennekings modified system for functional evaluation of surgical management of musculoskeletal tumors. Of 5 cases which were treated with conventional THRA or bipolar endoprosthetic replacement, 4 cases were good and 1 case was fair. Of 7 cases treated with tumor prosthetic replacement, 3 cases were good, 2 cases were fair and 2 cases were poor.