Molt Mats, Ryd Leif, Toksvig-Larsen Sören
a Department of Orthopedics, Hässleholm Hospital and Department of Clinical Sciences , Lund University , Lund ;
b Medical Management Center , Karolinska Institutet , Stockholm , Sweden.
Acta Orthop. 2016 Jun;87(3):262-7. doi: 10.3109/17453674.2016.1166876. Epub 2016 Apr 18.
Background and purpose - There is a general call for phased introduction of new implants, and one step in the introduction is an early evaluation of micromotion. We compared the micromotion in the Triathlon and its predecessor, the Duracon total knee prosthesis, concentrating especially on continuous migration over 5 years of follow-up. Patients and methods - 60 patients were randomized to receive either a cemented Triathlon total knee prosthesis or a cemented Duracon total knee prosthesis. 3-D tibial component migration was measured by radiostereometric analysis (RSA) at 3 months and at 1, 2, and 5 years. Results - There was no statistically significant difference in maximum total point motion (MTPM) between the 2 groups (p = 0.1). The mean MTPM at 5 years for the Duracon was 1.10 (SD 1.21) mm and for the Triathlon it was 0.66 (SD 0.38) mm. The numbers of continuously migrating prostheses were similar in the groups at the fifth year of follow-up; 6 of 21 prostheses in the Duracon group and 3 of 21 in the Triathlon group had migrated more than 0.3 mm between the second year and the fifth year of follow-up (p = 0.2). Interpretation - The Triathlon has a micromotion pattern similar to that of the Duracon total knee system at both short-term and medium-term follow-up, and may therefore, over time, show the same good long-term mechanical stability.
背景与目的——普遍呼吁分阶段引入新型植入物，而引入过程中的一个步骤是对微动进行早期评估。我们比较了Triathlon及其前身Duracon全膝关节假体的微动情况，尤其关注5年随访期内的持续移位。患者与方法——60例患者被随机分为两组，分别接受骨水泥固定的Triathlon全膝关节假体或骨水泥固定的Duracon全膝关节假体。通过放射立体测量分析（RSA）在3个月、1年、2年和5年时测量三维胫骨组件的移位情况。结果——两组之间的最大总点运动（MTPM）无统计学显著差异（p = 0.1）。Duracon假体在5年时的平均MTPM为1.10（标准差1.21）mm，Triathlon假体为0.66（标准差0.38）mm。在随访的第五年，两组中持续移位的假体数量相似；Duracon组21个假体中有6个、Triathlon组21个假体中有3个在随访的第二年至第五年期间移位超过0.3 mm（p = 0.2）。解读——在短期和中期随访中，Triathlon的微动模式与Duracon全膝关节系统相似，因此，随着时间推移，可能会表现出同样良好的长期机械稳定性。
