Laboratory of Biomechanics and Motor Control (LABCOM), Physiotherapy Department, School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente, Sao Paulo, Brazil.
La Trobe Sports and Exercise Medicine Research Center (LASEM), School of Allied Health, La Trobe University, Bundoora, Victoria, Australia.
J Strength Cond Res. 2021 Oct 1;35(10):2878-2885. doi: 10.1519/JSC.0000000000003215.
Ferreira, AS, de Oliveira Silva, D, Ferrari, D, Magalhães, FH, Pappas, E, Briani, RV, Pazzinatto, MF, and de Azevedo, FM. Knee and hip isometric force steadiness are impaired in women with patellofemoral pain. J Strength Cond Res 35(10): 2878-2885, 2021-The purposes were as follows: to compare knee extension and hip abduction force steadiness and maximal strength between women with patellofemoral pain (PFP) and pain-free women; and to investigate whether maximal strength, self-reported pain during force-matching tasks, self-reported knee function, symptoms duration, and physical activity level are associated with knee extension and hip abduction force steadiness. Thirty women with PFP and 30 pain-free women were recruited. Knee extension and hip abduction maximal voluntary isometric contractions and submaximal isometric force-matching tasks were evaluated using an isokinetic dynamometer. Subjects were asked to match a target force corresponding to 10% of their maximal isometric voluntary contraction while force steadiness was computed as the coefficient of variation (CV) of the exerted force. Women with PFP had significant 36% lower knee extension and 33% lower hip abduction peak strength. They also had significant 70% lower knee extension force steadiness and 60% lower hip abduction force steadiness (i.e., higher CV) than pain-free women. Self-reported pain and self-reported knee function were significantly associated (r = 0.61, p < 0.001; r = -0.35, p = 0.05) and able to predict 41% of the variance of knee extensor force steadiness. Hip abductor maximum strength was significantly associated (r = -0.57; p = 0.001) and able to predict 32% of the variance of hip abductor force steadiness. These findings indicate that muscle impairments in PFP go beyond only low knee and hip muscle strength because women with PFP also present deficits in knee extension and hip abduction force steadiness. Evidence-based treatments aiming at improving force steadiness may be a promising addition to PFP rehabilitation programs.
费雷拉，AS，德奥利维拉席尔瓦，D，法拉利，D，马加良斯，FH，帕帕斯，E，布里亚尼，RV，帕赞阿托，MF，和德阿泽维多，FM。髌股疼痛女性的膝关节和髋关节等长力量稳定性受损。J 力量与条件研究 35(10)：2878-2885，2021-目的如下：比较髌股疼痛（PFP）女性与无痛女性的膝关节伸展和髋关节外展等长力量稳定性和最大力量；并探讨最大力量、力量匹配任务时的自我报告疼痛、自我报告膝关节功能、症状持续时间和身体活动水平与膝关节伸展和髋关节外展等长力量稳定性的关系。招募了 30 名髌股疼痛女性和 30 名无痛女性。使用等速测力计评估膝关节伸展和髋关节外展最大自主等长收缩和亚最大等长力量匹配任务。要求受试者在匹配目标力时，该目标力对应于其最大等长自主收缩的 10%，同时通过施加力的变异系数（CV）计算力稳定性。PFP 女性的膝关节伸展和髋关节外展峰值力量分别显著降低 36%和 33%。与无痛女性相比，她们的膝关节伸展力稳定性也显著降低 70%，髋关节外展力稳定性显著降低 60%（即 CV 更高）。自我报告的疼痛和自我报告的膝关节功能显著相关（r = 0.61，p < 0.001；r = -0.35，p = 0.05），并能预测膝关节伸肌力稳定性 41%的方差。髋关节外展肌最大力量与髋关节外展力稳定性显著相关（r = -0.57；p = 0.001），并能预测髋关节外展力稳定性 32%的方差。这些发现表明，PFP 中的肌肉损伤不仅仅是膝关节和髋关节肌肉力量低，因为 PFP 女性的膝关节伸展和髋关节外展力稳定性也存在缺陷。旨在改善力量稳定性的循证治疗可能是 PFP 康复计划的一个有前途的补充。
