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Journal of Bone and Joint Surgery - British Volume, Vol 85-B, Issue 6,
822-825.
doi: 10.1302/0301-620X.85B6.14079 Copyright © 2003 by British Editorial Society of Bone and Joint Surgery 3M integral bipolar cup system for dysplastic osteoarthritisCLINICAL AND RADIOGRAPHIC REVIEW WITH FIVE- TO SEVEN-YEAR FOLLOW-UPT. Torisu, MD, PhD, Professor and Orthopaedic Surgeon; N. Kaku, MD, PhD, Assistant Professor and Orthopaedic Surgeon; H. Tumura, MD, PhD, Assistant Professor and Orthopaedic Surgeon; and H. Taira, MD, Consultant Orthopaedic SurgeonDepartment of Orthopaedic Surgery and Oncological Science, Faculty of Medicine, Oita Medical University, Hasama-cho, Oita 879-5593, Japan. K. Tomari, MD, Consultant Orthopaedic Surgeon Section of Orthopaedic Surgery, Shinbeppu Hospital, 3898 Tsurumi Beppu, Oita 874-0833, Japan. Correspondence should be sent to Professor T. Torisu. Between 1995 and 1997 we undertook 40 bipolar hip arthroplasties in 35 patients with dysplastic osteoarthritis. The steep and shallow acetabulum was excavated and the bipolar socket was placed high with an adjustment of leg-length. At follow-up of between five and seven years, there were 19 excellent, 16 good and five fair results according to the scoring system of Merle dAubigné and Postel. The mean radiographic superior migration of the bipolar socket was 2.1 mm (0 to 10). Osteolysis was noted in three hips within three years of the operation. Abduction on weight-bearing was recorded in 24 hips and the bipolar system was found to be functioning predominantly between the inner bearing and the metal femoral head in 20.
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