Wang Aiguo, Yau Shi-Shen, Essner Aaron, Herrera Lizeth, Manley Michael, Dumbleton John
Stryker Orthopaedics, Mahwah, New Jersey 07430, USA.
J Arthroplasty. 2008 Jun;23(4):559-66. doi: 10.1016/j.arth.2007.05.007. Epub 2008 Feb 13.
X3 is a highly crosslinked ultrahigh molecular weight polyethylene (UHMWPE) produced by a sequential irradiation and annealing process. The sequential process results in a material with a free radical content that is 1% that of conventional UHMWPE gamma sterilized in nitrogen resulting in an oxidation resistance similar to that of virgin UHMWPE. Yield strength and ultimate tensile strength exceed American Society for Testing and Materials minimum rates for UHMWPE. Simulator testing of contemporary cruciate retaining (CR) and posterior-stabilized knee inserts (Triathlon) manufactured by the sequential process demonstrated 68% and 64% less wear, respectively, compared to conventionally processed inserts. The wear and mechanical integrity of sequentially processed posterior-stabilized inserts was unaffected by accelerated aging, whereas conventional UHMWPE exhibited increased wear, cracking, and delamination.
X3是一种通过顺序辐照和退火工艺生产的高度交联超高分子量聚乙烯（UHMWPE）。该顺序工艺产生的材料自由基含量仅为在氮气中进行γ灭菌的传统UHMWPE的1%，其抗氧化性与原始UHMWPE相似。屈服强度和极限拉伸强度超过美国材料与试验协会对UHMWPE规定的最低标准。对采用该顺序工艺制造的当代保留交叉韧带（CR）和后稳定型膝关节插入物（Triathlon）进行模拟器测试表明，与传统加工的插入物相比，磨损分别减少了68%和64%。顺序加工的后稳定型插入物的磨损和机械完整性不受加速老化的影响，而传统UHMWPE的磨损、开裂和分层则有所增加。
