von Schewelov Thord, Besjakov Jack, Sanzén Lennart, Carlsson Ake
Department of Orthopaedics, Malmö University Hospital, SE-205 02 Malmö, Sweden.
J Knee Surg. 2009 Jul;22(3):231-6. doi: 10.1055/s-0030-1247754.
The press-fit condylar (PFC) cruciate-retaining total knee prosthesis is well documented in the literature. In 1997, a modification of the femoral component was introduced, and the prosthesis was renamed PFC-Sigma. The alteration may influence the migratory and rotational pattern of the tibial component and thus long-time survival rate. In this radiostereometric analysis, we found that the micromotion of the PFC-Sigma prosthesis differs slightly from the original PFC design, an advantage of the PFC-Sigma prosthesis. The median maximum total point motion at 5 years was 0.64 mm for the PFC-Sigma design and 0.79 mm for the previous version of PFC (P = .9). However, the PFC-Sigma rotated less around the transverse (x) axis than did the PFC (medians, 0.22 mm and 0.48 mm, respectively; P = .04). From the radiostereometric, radiographic, and clinical data, we conclude that the PFC-Sigma knee prosthesis can be used with confidence.
文献中对压配型髁间（PFC）保留十字韧带全膝关节假体已有充分记载。1997年，对股骨部件进行了改进，该假体被重新命名为PFC-Sigma。这种改变可能会影响胫骨部件的移动和旋转模式，进而影响长期生存率。在这项放射立体测量分析中，我们发现PFC-Sigma假体的微动与原始PFC设计略有不同，这是PFC-Sigma假体的一个优点。PFC-Sigma设计在5年时的最大总点数运动中位数为0.64毫米，而PFC的先前版本为0.79毫米（P = 0.9）。然而，PFC-Sigma绕横轴（x轴）的旋转比PFC少（中位数分别为0.22毫米和0.48毫米；P = 0.04）。根据放射立体测量、放射影像学和临床数据，我们得出结论，PFC-Sigma膝关节假体可以放心使用。
