Thrity - two patients with surgically treated osteoarthritis of the hip joints were evaluated for lumbar scoliosis. Twenty of them (63%) had scoliosis of 4 degrees or more. Preoperative X - rays after correcting of leg length discrepancy and pelvic obliquity revealed that there had been no change in the lumbar scoliosis in 7 patients. What the changes of lumbar scoliosis and pelvic obliquity will be after surgery of the hip joint should be estimated preoperatively.