Hansen F W, Rechnagel K
Acta Orthop Scand. 1977;48(4):394-9. doi: 10.3109/17453677708992015.
The Monk hip prosthesis is a one-piece block prosthesis consisting of a metal femoral component with the head enclosed in a polyethylene cup. The standard type is fixed without cement. Most of the hip movements take place between the metal and the polyethylene cup. 104 Monk arthroplasties were performed. 95 hips in 84 patients have been available for regular examination and follow-up. The follow-up period was from 12 to 30 months, an average of 19 months. Out of the 95 cases, 72 were classified as excellent, 10 as good and 13 as unchanged. The results obtained during the first year were comparable to those obtained with the Ring prosthesis, but during the following 1 1/2 years eight revisions had to be performed. The main reason for the deterioration was loosening of the femoral component, probably because in the standard type it is too short and the neck has too great a varus inclination, resulting in a rather strong tilting force. Because no cement has been used the revisions have been quite easy to perform. Another reason for failure has been wear of the polyethylene cup, in one case with a massive foreign body reaction. In spite of a short follow-up period this report illustrates the failures due to the design of the prosthesis, and therefore an improved construction is now in use.
蒙克髋关节假体是一种一体式块状假体，由金属股骨部件和包裹在聚乙烯杯中的股骨头组成。标准型为无骨水泥固定。大部分髋关节运动发生在金属部件和聚乙烯杯之间。共进行了104例蒙克关节成形术。84例患者的95个髋关节可供定期检查和随访。随访期为12至30个月，平均19个月。95例中，72例评定为优，10例为良，13例无变化。第一年获得的结果与使用林氏假体获得的结果相当，但在随后的1.5年中，不得不进行8次翻修。病情恶化的主要原因是股骨部件松动，可能是因为标准型太短，颈部内翻倾斜度太大，导致相当大的倾斜力。由于未使用骨水泥，翻修手术相当容易进行。失败的另一个原因是聚乙烯杯磨损，有1例出现大量异物反应。尽管随访期较短，但本报告说明了由于假体设计导致的失败情况，因此现在正在使用改进后的结构。
