Younger A S, Beauchamp C P, Duncan C P, McGraw R W
Department of Orthopaedic Surgery, University of British Columbia, Vancouver, Canada.
J Arthroplasty. 1995 Feb;10(1):53-61. doi: 10.1016/s0883-5403(05)80101-9.
A method for assessing knee joint position after surgery using the preoperative long-leg radiograph and the postoperative knee radiograph is described. Assessment of the formula has shown a near perfect correlation between the calculated position on the long-leg radiograph compared with the measured position for 44 knees. Three hundred eighteen knees after total joint arthroplasty were retrospectively reviewed and the postoperative position was determined. The preoperative position of the mechanical axis was 14.5 +/- 37.3 mm medial to the knee joint center. Using the standing knee radiograph the postoperative position of the mechanical axis was 3.07 +/- 9.2 mm lateral to the knee joint center, while the portable radiograph placed the mechanical axis 4.5 +/- 12.4 mm medial to the knee joint center. There was a highly significant difference in the position of the knee joint center depending on the radiograph used for calculation (standing or portable). The difference between the two means was not due to opening of the knee joint, but likely due to change in the rotation of the knee in the presence of knee flexion. This series of the knee arthroplasties has a low projected rate of aseptic failure.
描述了一种使用术前长腿X线片和术后膝关节X线片评估手术后膝关节位置的方法。对该公式的评估表明，在44个膝关节中，长腿X线片上计算出的位置与测量位置之间显示出近乎完美的相关性。对318例全关节置换术后的膝关节进行回顾性分析，并确定术后位置。机械轴的术前位置在膝关节中心内侧14.5±37.3mm处。使用站立位膝关节X线片时，机械轴的术后位置在膝关节中心外侧3.07±9.2mm处，而便携式X线片则将机械轴置于膝关节中心内侧4.5±12.4mm处。根据用于计算的X线片（站立位或便携式）不同，膝关节中心的位置存在高度显著差异。两种测量结果之间的差异并非由于膝关节的张开，而可能是由于膝关节在屈曲时旋转的改变。这一系列膝关节置换术的无菌性失败预计发生率较低。
