Objective To evaluate the clinical results of cementless total hip replacement (THR) in treating osteoarthritis and identifying the factors affecting the results. Methods From January 1995 to December 1999, 76 patients(85 hips) with osteoarthritis of hip joint were treated. These patients were assessed according to Harris hip score and X-ray film. The average follow-up time was 49.3 months. Results The average Harris score in the patients was 90.9 points. The excellent or good rate was 91.9%(75/85). Pain in the thigh existed in 23 hips (27.5%). The femoral osteolysis occurred in 14 hips(16.5%). The radiographical result demonstrated femoral loosening in 2 hips. harris score became lower when the femoral component of osteoarthritis of hip jointl. Pain in the thigh may be related to the varus placement of femoral component and femoral osteolysis. Femorla osteolysis is one of important factors affectin the long-term outcomes.