Brown Michael J C, Vella-Baldacchino Martinique, O'Flaherty Emmett, Jenkins Paul J
Department of Trauma and Orthopaedic Surgery, Gatehouse Building, Glasgow Royal Infirmary, 84 Castle Street, Glasgow G40SF, United Kingdom of Great Britain and Northern Ireland.
Department of Surgery, John Radcliffe Hospital, Headley Way, Oxford OX3 9DU, United Kingdom of Great Britain and Northern Ireland.
Knee. 2018 Oct;25(5):915-922. doi: 10.1016/j.knee.2018.06.015. Epub 2018 Jul 13.
Body mass index (BMI) has not been shown to correlate with Patient Reported Outcome Measures (PROMs) following total knee arthroplasty (TKA). We investigated the relationship between weight, BMI, limb morphology, and Oxford Knee Score (OKS). Furthermore, the utility of a novel radiological measurement, the Knee Mass Index (KMI), was investigated.
Data including weight, BMI, gender, preoperative and 12 month OKS were collected from an arthroplasty database that contained 268 patients who underwent TKA. Measurements of soft tissue and bone width were made from the preoperative radiograph and 'KMI' was calculated. Pearson correlation and multivariate regression analyses were used to assess the relationship between OKS and the above variables.
The novel measurement, KMI, was not a predictor of the OKS. The BMI was predictive of initial OKS (Odds Ratio (OR) -0.26 p < 0.001), 12 month OKS (OR -0.39 p < 0.001) and change in OKS (OR -0.39 p < 0.001). The initial OKS was predictive of 12 month OKS (OR 0.32 p < 0.001) and change in OKS (OR -0.68 p < 0.001).
The novel KMI metric was not useful in predicting function. Both the post-operative OKS and change in OKS are predicted by BMI and pre-operative OKS. This is one of the first studies to show a relationship between BMI and OKS.
体重指数（BMI）尚未被证明与全膝关节置换术（TKA）后的患者报告结局测量指标（PROMs）相关。我们研究了体重、BMI、肢体形态与牛津膝关节评分（OKS）之间的关系。此外，还研究了一种新型放射学测量指标——膝关节质量指数（KMI）的效用。
从一个包含268例行TKA患者的关节置换数据库中收集体重、BMI、性别、术前和术后12个月OKS等数据。通过术前X光片测量软组织和骨宽度，并计算“KMI”。采用Pearson相关性分析和多元回归分析来评估OKS与上述变量之间的关系。
新型测量指标KMI不是OKS的预测指标。BMI可预测初始OKS（优势比（OR）-0.26，p<0.001）、12个月OKS（OR -0.39，p<0.001）以及OKS的变化（OR -0.39，p<0.001）。初始OKS可预测12个月OKS（OR 0.32，p<0.001）以及OKS的变化（OR -0.68，p<0.001）。
新型KMI指标在预测功能方面并无用处。BMI和术前OKS可预测术后OKS以及OKS的变化。这是首批表明BMI与OKS之间存在关系的研究之一。
