Factors influencing joint-preserving operations in the treatment of the late stages of osteoarthritis of the hipS. Ohsawa, MD, ChiefDepartment of Rehabilitation Medicine, Osaka Rosai Hospital, 1179-3 Nagasone-Cho, Sakai-Shi, Osaka 591-8025, Japan. Y. Inamori, MD, Orthopaedic Surgeon Department of Orthopaedic Surgery, Osaka Teishin Hospital, 2-6-40 Karasugatsuji, Tennohji-Ku, Osaka 543, Japan. S. Matsushita, MD, Orthopaedic Surgeon; and H. Norimatsu, MD, Professor and Chairman Department of Orthopaedic Surgery, School of Medicine, Kagawa Medical University, 1750-1 Ikenobe, Miki-Cho, Kida-Gun, Kagawa 761-07, Japan. R. Ueno, MD, Director Hoshigaoka Koseinenkin Hospital, 4-8-1 Hoshigaoka, Hirakata, Osaka 573-0013, Japan. Correspondence should be sent to Dr S. Ohsawa. Between November 1983 and December 1992, 136 hips (119 patients) with coxarthritis were operated on using joint-preserving techniques based on the rationale of Pauwels’ osteotomy. The criterion for selection was a patient in whom the height of the joint space in the weight-bearing area of the hip was less than 1 mm. The mean age at operation was 48 years and the mean follow-up 109 months (60 to 171). Hips were categorised using Bombelli’s classification of osteoarthritis, into atrophic and non-atrophic types. The endpoint was defined as that at which the height of the joint space became less than 1 mm again. The Kaplan-Meier curve showed that the rate of survival of the non-atrophic group was significantly better than that of the atrophic group. Cox’s proportional hazard model indicated that the factors influencing the results of joint-preserving operations included Bombelli’s classification, postoperative incongruence of the joint and the height of the joint space.
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