Bengs Benjamin C, Scott Richard D
Harvard Combined Orthopaedic Surgery Residency, Massachusetts General Hospital, Boston, 02114, USA.
J Arthroplasty. 2006 Feb;21(2):161-6. doi: 10.1016/j.arth.2005.06.008.
Full passive extension in total knee arthroplasty is predicated on creating a large enough extension gap to accommodate any given combined thickness of femoral and tibial components. Additional distal femoral resection can achieve more passive knee extension. The predictable effect of further distal femoral resection has never been studied. We designed a simple institutional review board-approved, intraoperative study to quantify this effect. Routine posterior cruciate ligament-preserving total knee arthroplasty was performed with measured femoral and tibial resections, yielding full passive extension with trial components. Distal femoral augments were then sequentially applied to the back of the femoral trial component, and passive knee extension was measured. The data show that an average value of 9 degrees of femoral contracture is corrected for every 2 mm of distal femoral resection.
全膝关节置换术中的完全被动伸直取决于创造足够大的伸直间隙，以容纳股骨和胫骨假体的任何给定组合厚度。额外的股骨远端截骨可以实现更多的膝关节被动伸直。进一步股骨远端截骨的可预测效果从未被研究过。我们设计了一项经机构审查委员会批准的简单术中研究来量化这种效果。采用测量的股骨和胫骨截骨进行常规保留后交叉韧带的全膝关节置换术，使用试验假体时可实现完全被动伸直。然后将股骨远端垫片依次应用于股骨试验假体的背面，并测量膝关节的被动伸直情况。数据表明，每进行2毫米的股骨远端截骨，平均可纠正9度的股骨挛缩。
