Abstract：
BACKGROUND: Patellofemoral pain (PFP) patients often show an altered lower limb alignment during the single-leg squat (SLS). There is evidence that proximal and distal-to-the-knee muscle alterations can modify the lower limb alignment in PFP patients. However, we observed a lack of studies investigating the possible association between the thickness and strength of proximal and distal-to-the-knee muscles and lower limb alignment during SLS in women with PFP. Therefore, this study aimed to investigate the association between the thickness and strength of lower limb muscles and dynamic knee valgus (DKV) during SLS in women with PFP.
METHODS: Cross-sectional study, where fifty-five women with PFP were submitted to the following evaluations: (1) muscle thickness (MT) of Gluteus Medius (GMed), Gluteus Maximus (GMax), Vastus Lateralis (VL), and Tibialis Anterior (TA); (2) isometric peak torque of hip abductors, hip external rotators, knee extensors, and foot inversors; and (3) DKV during SLS.
RESULTS: There was a significant negative association between GMax\'s MT and DKV (r = -0.32; p = 0.01), and between TA\'s MT and DKV (r = -0.28; p = 0.03). No significant correlations were observed between isometric torques and DKV. Regression analysis found that GMax\'s MT explained 10% of the DKV\'s variance during SLS.
CONCLUSIONS: Poor lower limb alignment during SLS is weakly associated with proximal and distal-to-the-knee muscle thicknesses, with no association with isometric torque in PFP women.
CONCLUSIONS: Our results suggest that other factors besides strength and muscle thicknesses may explain and improve lower limb alignment in women with PFP.
METHODS: Cross-sectional study, where fifty-five women with PFP were submitted to the following evaluations: (1) muscle thickness (MT) of Gluteus Medius (GMed), Gluteus Maximus (GMax), Vastus Lateralis (VL), and Tibialis Anterior (TA); (2) isometric peak torque of hip abductors, hip external rotators, knee extensors, and foot inversors; and (3) DKV during SLS.
RESULTS: There was a significant negative association between GMax\'s MT and DKV (r = -0.32; p = 0.01), and between TA\'s MT and DKV (r = -0.28; p = 0.03). No significant correlations were observed between isometric torques and DKV. Regression analysis found that GMax\'s MT explained 10% of the DKV\'s variance during SLS.
CONCLUSIONS: Poor lower limb alignment during SLS is weakly associated with proximal and distal-to-the-knee muscle thicknesses, with no association with isometric torque in PFP women.
CONCLUSIONS: Our results suggest that other factors besides strength and muscle thicknesses may explain and improve lower limb alignment in women with PFP.
摘要：
背景：髌股疼痛（PFP）患者在单腿下蹲（SLS）过程中经常显示下肢排列改变。有证据表明，近端和远端至膝关节的肌肉改变可以改变PFP患者的下肢排列。然而,我们观察到,缺乏调查PFP女性SLS期间膝关节近端和远端肌肉的厚度和强度与下肢对位之间可能存在的关联的研究.因此,本研究旨在探讨女性PFP患者SLS期间下肢肌肉厚度和强度与动态膝关节外翻（DKV）之间的关系。
方法：横断面研究，其中55名患有PFP的女性接受了以下评估：（1）GluteusMedius（GMed）的肌肉厚度（MT），GluteusMaximus(GMax),腹肌(VL),和胫骨前肌（TA）；（2）髋关节外展肌的等距峰值扭矩，髋部外部旋转器,膝盖伸肌,和脚力；和（3）SLS期间的DKV。
结果：GMax的MT与DKV之间存在显着负相关（r=-0.32；p=0.01），在TA的MT和DKV之间（r=-0.28；p=0.03）。在等距扭矩和DKV之间没有观察到显着的相关性。回归分析发现，GMax的MT解释了SLS期间DKV方差的10%。
结论：SLS期间下肢排列不良与膝关节近端和远端肌肉厚度弱相关，与PFP女性的等距扭矩无关。
结论：我们的结果表明，除了力量和肌肉厚度之外，其他因素也可以解释和改善PFP女性的下肢排列。
方法：横断面研究，其中55名患有PFP的女性接受了以下评估：（1）GluteusMedius（GMed）的肌肉厚度（MT），GluteusMaximus(GMax),腹肌(VL),和胫骨前肌（TA）；（2）髋关节外展肌的等距峰值扭矩，髋部外部旋转器,膝盖伸肌,和脚力；和（3）SLS期间的DKV。
结果：GMax的MT与DKV之间存在显着负相关（r=-0.32；p=0.01），在TA的MT和DKV之间（r=-0.28；p=0.03）。在等距扭矩和DKV之间没有观察到显着的相关性。回归分析发现，GMax的MT解释了SLS期间DKV方差的10%。
结论：SLS期间下肢排列不良与膝关节近端和远端肌肉厚度弱相关，与PFP女性的等距扭矩无关。
结论：我们的结果表明，除了力量和肌肉厚度之外，其他因素也可以解释和改善PFP女性的下肢排列。
