Sychterz C J, Shah N, Engh C A
Anderson Orthopaedic Research Institute, Alexandria, Virginia 22307, USA.
J Arthroplasty. 1998 Aug;13(5):508-14. doi: 10.1016/s0883-5403(98)90049-3.
To help increase the longevity of polyethylene components used in total joint arthroplasty, new forms of ultrahigh molecular weight polyethylene (UHMWPE) have been developed. This study reports on the in vivo performance of Hylamer (DePuy DuPont Orthopaedics, Newark, DE), a high crystalline form of UHMWPE, and on the performance of conventional Enduron polyethylene (DePuy, Warsaw, IN). With the use of a specially designed computer system, the time course of two-dimensional femoral head penetration into 80 Hylamer and 140 Enduron acetabular liners in situ from two to five years was compared. At the most recent follow-up (mean, 3.6 years), the rate of femoral head penetration into the Hylamer liners was lower than the rate of head penetration into the Enduron liners (0.15 mm/year versus 0.20 mm/year, P = . 10). Temporal analysis revealed that the Hylamer liners had lower penetration rates than those of the conventional polyethylene liners in the first three postoperative years, but that head-penetration rates between the two groups became similar with increased time in situ. Continued examination of both types of polyethylene components is imperative before conclusions on long-term performance can be drawn.
为了延长全关节置换术中使用的聚乙烯部件的使用寿命，已开发出超高分子量聚乙烯（UHMWPE）的新形式。本研究报告了高结晶形式的UHMWPE——Hylamer（美国特拉华州纽瓦克市迪普伊杜邦骨科公司）的体内性能，以及传统的Enduron聚乙烯（美国印第安纳州华沙市迪普伊公司）的性能。使用专门设计的计算机系统，比较了二维股骨头在80个Hylamer髋臼衬垫和140个Enduron髋臼衬垫中原位从两年到五年的穿透时间过程。在最近的随访中（平均3.6年），股骨头在Hylamer衬垫中的穿透率低于在Enduron衬垫中的穿透率（0.15毫米/年对0.20毫米/年，P = 0.10）。时间分析显示，在前三年，Hylamer衬垫的穿透率低于传统聚乙烯衬垫，但随着在位时间的增加，两组之间的股骨头穿透率变得相似。在得出关于长期性能的结论之前，必须继续对这两种类型的聚乙烯部件进行检查。
