Weaver J K, Derkash R S, Greenwald A S
Orthopaedic Associates of Aspen and Glenwood, Glenwood Springs, Colorado.
Clin Orthop Relat Res. 1993 May(290):244-52.
In 1980, the low contact stress, or New Jersey, system was introduced with movable high-density polyethylene bearings between the metallic femoral and tibial components. This system was developed to deal with two principal concerns of conventional knee replacement systems: loosening and wear. A federal Drug Administration review was required, and the study was performed in two phases. From 1981 until 1984, components were cemented in 40 knees, which then were evaluated for an average of seven years after surgery. From 1984 until 1986, 16 knees were selected for cementless fixation and were followed for an average of five years. The cemented group had a failure rate of 10% (four knees), two from tibial component loosening, one from bearing dislocation, and one from infection. Failure was determined by the necessity for revision. The uncemented group had a failure rate of 31% (four knees from bearing fracture and one from knee pain of uncertain source). Bearing failure was attributable to the entrapment of the subluxed lateral bearing. Sacrifice of the anterior cruciate ligament predisposes the system to bearing subluxation and failure.
1980年，低接触应力系统（即新泽西系统）问世，该系统在金属股骨和胫骨部件之间采用了可移动的高密度聚乙烯轴承。开发此系统是为了解决传统膝关节置换系统的两个主要问题：松动和磨损。该系统需要经过美国食品药品监督管理局的审查，研究分两个阶段进行。1981年至1984年，在40个膝关节中进行了骨水泥固定，术后平均对这些膝关节进行了七年的评估。1984年至1986年，选择16个膝关节进行非骨水泥固定，并平均随访五年。骨水泥固定组的失败率为10%（四个膝关节），其中两个是由于胫骨部件松动，一个是由于轴承脱位，一个是由于感染。失败是通过翻修的必要性来确定的。非骨水泥固定组的失败率为31%（四个膝关节因轴承骨折，一个膝关节因来源不明的膝关节疼痛）。轴承失效归因于外侧半脱位轴承的卡压。前交叉韧带的牺牲使该系统易发生轴承半脱位和失效。
