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首页> 外文期刊>Orthopaedic Journal of Sports Medicine >Change in mechanical axis alignment highly correlates with increased limb loading after total knee arthroplasty
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Change in mechanical axis alignment highly correlates with increased limb loading after total knee arthroplasty

机译：机械轴对准的变化与全膝关节置换术后肢体负荷增加高度相关

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Aims and Objectives: Mechanical axis of the lower limb assessed in standing long-leg radiographs was demonstrated to change within the first three postoperative months after total knee arthroplasty (TKA). The underlying mechanism including the influence of limb loading for the change in mechanical axis alignment after TKA has not been evaluated so far. Materials and Methods: Mechanical axis of the lower limb and limb loading were evaluated in 115 patients 10 days and 12 weeks after TKA. Mechanical axis was measured in standing long-leg radiographs while limb loading was simultaneously assessed using a scale. Absolute and relative limb loading with their correlation to the mechanical axis were calculated. Results: Mechanical axis in patients with postoperative complete extension (n = 100) changed from an initial -0.82° ± 1.9° valgus alignment to a varus axis of +0.6° ± 1.5 (p < 0.01). This change in alignment was accompanied by an increased limb loading from 89.9% 10.7% to 93.0% 7.0% (p < 0.01). The mechanical axis highly/significantly correlated with relative limb loading in both measurements (r = 0.804, p < 0.001 respectively r = 0.562, p < 0.001). These alterations and distinctions were much more pronounced in patients with postoperative incomplete extension. Conclusion: Mechanical axis of the leg significantly changes while limb loading increases within the first three postoperative months after TKA. The postoperative alignment highly correlates with the loading of the lower limb. Therefore, the actual mechanical axis can only be assessed at physiological limb loading in long-leg radiographs at complete extension with full weight bearing.
机译：目的和目的：经证实，在站立式长腿X光片中评估的下肢机械轴在全膝关节置换术（TKA）术后的前三个月内发生变化。到目前为止，尚未评估潜在的机制，包括肢体负荷对TKA后机械轴对齐方式变化的影响。材料和方法：在TKA术后10天和12周，对115例患者的下肢机械轴和肢体负荷进行了评估。在站立的长腿X射线照片中测量机械轴，同时使用秤同时评估肢体负荷。计算与机械轴相关的绝对和相对肢体负荷。结果：术后完全伸展（n = 100）的患者的机械轴从最初的-0.82°±1.9°外翻对准改变为+ 0.6°±1.5的内翻轴（p <0.01）。这种对齐方式的改变伴随着肢体负荷从89.9％10.7％增加到93.0％7.0％（p <0.01）。在两次测量中，机械轴均与相对肢体负荷高度相关（r = 0.804，p <0.001，r = 0.562，p <0.001）。这些改变和区别在术后不完全伸展的患者中更为明显。结论：在TKA术后的前三个月内，腿的机械轴显着变化，而肢体负荷增加。术后对准与下肢的负荷高度相关。因此，实际机械轴只能在长腿X线片上完全伸展并完全承重的生理肢体负荷下评估。

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