University of Southern Denmark, Odense, Denmark.
Arthritis Care Res (Hoboken). 2010 Sep;62(9):1244-51. doi: 10.1002/acr.20201.
Reduced muscle strength is suggested as a risk factor for knee osteoarthritis (OA). Meniscectomy patients have an increased risk of developing knee OA. The aim of this study was to identify reductions in different aspects of muscle strength as well as objectively measured and self-reported lower extremity function in middle-aged patients who had undergone a meniscectomy compared with controls.
Thirty-one patients who had undergone surgery in 2006 and 2007 (mean ± SD age 46 ± 6 years, mean ± SD body mass index [BMI] 26 ± 4 kg/m(2), and mean ± SD postsurgery 21 ± 6 months) and 31 population-based controls (mean ± SD age 46 ± 6 years and mean ± SD BMI 26 ± 4 kg/m(2)) were examined for maximal muscle strength and rapid force capacity, distance achieved during the one-leg hop test, and the maximum number of knee bends performed in 30 seconds. The Knee Injury and Osteoarthritis Outcome Score (KOOS) was used to determine self-reported outcomes.
No differences were detected in any muscle strength variables between the operated and nonoperated leg (mean ± SD quadriceps maximum voluntary contraction of 2.80 ± 0.10 for the operated leg and 2.88 ± 0.10 for the nonoperated leg), between patients and controls (mean ± SD torque of 2.70 ± 0.09 Nm × kg(-1) for the controls; P = 0.26 for main effect leg), or in objectively measured function (P ≥ 0.27). Patients reported 10-26 points worse KOOS scores in all 5 subscales (P < 0.001).
Thigh muscle strength is not impaired in middle-aged adults 2 years after resection of a degenerative tear. Our findings indicate that factors other than muscle strength are responsible for the perceived functional limitations and suggest that training to improve strength alone may not be sufficient to improve self-reported function in patients at high risk of knee OA.
肌肉力量下降被认为是膝关节骨关节炎（OA）的一个风险因素。半月板切除术患者患膝 OA 的风险增加。本研究的目的是确定与对照组相比，中年半月板切除术患者在不同肌肉力量方面的下降，以及客观测量和自我报告的下肢功能下降。
对 2006 年和 2007 年接受手术的 31 名患者（平均年龄 ± 标准差 46 ± 6 岁，平均体重指数 [BMI] ± 标准差 26 ± 4 kg/m2，平均术后 ± 标准差 21 ± 6 个月）和 31 名基于人群的对照组（平均年龄 ± 标准差 46 ± 6 岁和平均 BMI ± 标准差 26 ± 4 kg/m2）进行最大肌肉力量和快速力量能力、单腿跳跃测试中达到的距离以及 30 秒内完成的最大膝关节弯曲次数的检查。使用膝关节损伤和骨关节炎结果评分（KOOS）来确定自我报告的结果。
在手术侧和非手术侧之间（手术侧股四头肌最大自愿收缩的平均值 ± 标准差 2.80 ± 0.10，非手术侧 2.88 ± 0.10）、患者和对照组之间（对照组的平均值 ± 标准差扭矩 2.70 ± 0.09 Nm×kg-1；P = 0.26 主要影响腿），或在客观测量的功能方面（P ≥ 0.27），均未发现任何肌肉力量变量存在差异。所有 5 个亚量表中，患者报告的 KOOS 评分差 10-26 分（P < 0.001）。
半月板切除术 2 年后，中年成年人的大腿肌肉力量并未受损。我们的发现表明，除肌肉力量以外的其他因素是导致感知功能受限的原因，并表明仅通过力量训练可能不足以改善高 OA 风险患者的自我报告功能。
