Orthopedics Departament, Hospital Militar D. Pedro V, Avenida da Boavista, 4050-113, Porto, Portugal,
Knee Surg Sports Traumatol Arthrosc. 2014 Mar;22(3):636-42. doi: 10.1007/s00167-013-2639-0. Epub 2013 Aug 29.
To compare the femoral and tibial components rotational alignment in total knee arthroplasty (TKA) performed either with conventional or with patient-specific instrumentation.
Forty-five patients underwent primary TKA and were prospectively randomized into two groups: 22 patients into the conventional instrumentation group (group A) and 23 patients into the Signature™ patient-specific instrumentation group (group B). All patients underwent computed tomography of the operated knee in the first week after surgery to measure the components rotation.
The femoral component rotation was 0.0° (-0.25, 1.0) in group A, and 0.0° (0.0, 1.0) in group B. The tibial component rotation was -16.0° (-18.5, 11.8) in group A, and -16.0° (-19.0, -14.0) in group B. There were no significant differences between the two groups in tibial and femoral components rotation. The difference between the tibial component rotation and the neutral tibial rotation was similar in both groups [2.0° (-0.5, 6.3) in group A and 2.0° (-1.0, 4.0) in group B], but the dispersion around the median was different between the two groups. The amplitude of the difference between tibial rotation and neutral position was 27° (-13, 14) in group A and 9° (-3, 6) in group B.
There is a smaller chance of internal malrotation of the tibial component with the Signature™ patient-specific instrumentation system, with less dispersion and amplitude of the tibial component rotation around the neutral position.
II.
比较常规组和个体化组在全膝关节置换术中股骨和胫骨组件的旋转对线。
45 名患者接受初次全膝关节置换术，并前瞻性随机分为两组：22 名患者进入常规组（A 组），23 名患者进入 Signature™个体化组（B 组）。所有患者术后第一周均接受膝关节 CT 检查，以测量组件旋转。
A 组股骨组件旋转度为 0.0°（-0.25，1.0），B 组为 0.0°（0.0，1.0）。A 组胫骨组件旋转度为-16.0°（-18.5，11.8），B 组为-16.0°（-19.0，-14.0）。两组胫骨和股骨组件旋转无显著差异。两组胫骨组件旋转与中立胫骨旋转的差值相似[A 组为 2.0°（-0.5，6.3），B 组为 2.0°（-1.0，4.0）]，但中位数周围的离散度不同。胫骨旋转与中立位差值的幅度在 A 组为 27°（-13，14），B 组为 9°（-3，6）。
Signature™个体化组系统更不易发生胫骨组件内旋，胫骨组件旋转在中立位周围的离散度和幅度更小。
II。
