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Development of Alumind ceramic Total Hip Prosthesis

铝陶瓷全髋关节假体的研制

基本信息

批准号：
62570690
负责人：
SHIMAZU Akira
金额：
$ 1.15万
依托单位：
OSAKA CITY UNIVERSITY MEDICAL SCHOOL
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Through the clinical experience of performing head bipolar hipprosthesis, we came to believe that it might be possible to improve this prothesis by changing the head from a metalic one to an alumina ceramic one. we accordingly developed a new bipolar hip prosthesis with an alumina ceramic outer head which is much more bioinert than a metallic one. This prototype modelwas tested with static load, impact force and repeated load, and having passed these tests well, we judged that it had enough strength for practical clinical use.Therefore we used this model clinically in femoral neck fracture, aseptic femoral head mecrosis and osteoarthritis. No problems in clinical and X-ray findings have been shown in thesecases to date, and all patients have rated the results as satisfactorily. The center was made offset in this model, in expectation of the so-called self-centering effect. This effect is discussed biomechanically using a mathematical model from thepoint of view of the differences of the head size and the frictional coefficient between metal and aluminaceramics.Now, we developed new model, which has alumina ceramic outer and inner head, with press fit type tifanium alloy stem and have used this model for osteo orthritis as bone cementless total hip prosthesis. These clinical experiences are verysuccessfully, and we are satisfied very much with clinical results.From 1987, to 1988, we performed 45joints replacement with thisprosthesis, and clinical results of these patients are 79.8points in J. O. A. score average.

通过对双极人工髋关节头的临床应用，我们认为，将金属头改为氧化铝陶瓷头，可能会对双极人工髋关节头进行改进。因此，我们开发了一种新的双极髋关节假体，其具有氧化铝陶瓷外头，该外头比金属外头更具有生物惰性。该原型模型经过静载荷、冲击力和重复载荷测试，通过这些测试，我们判断其具有足够的强度用于实际临床使用，因此我们将该模型用于临床治疗股骨颈骨折、无菌性股骨头坏死和骨关节炎。到目前为止，这些病例的临床和X线表现没有问题，所有患者都对结果表示满意。在这个模型中，中心被偏移，以期望所谓的自定心效应。本文从生物力学的角度，从金属与铝陶瓷的头尺寸和摩擦系数的差异，用数学模型讨论了这种影响，并研制了一种新的模型，它具有铝陶瓷外头和内头，压配型钛合金柄，并将这种模型用于骨矫形器作为非骨水泥型全髋关节假体。自1987年至1988年，我们共进行了45例人工关节置换术，J.O.评分为79.8分。A.平均得分。