Influence of patellofemoral joint reaction force changes at small knee flexion angles on patellofemoral pain during single limb landing in active females.

IF 1.5 4区医学 Q2 REHABILITATION

Physiotherapy Theory and Practice Pub Date : 2026-05-01 Epub Date: 2025-12-02 DOI:10.1080/09593985.2025.2594578

Lee T Atkins, Hyung Suk Yang, C Roger James

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引用次数: 0

Abstract

Background: Excessive patellofemoral joint (PFJ) loading is considered a primary stimulus for patellofemoral pain (PFP) development. However, little is known about how changes in PFJ loading influence PFP in active females, who are affected more frequently than males.

Purpose: Examine if changes in the patellofemoral joint reaction force (PFJRF) caused by forward trunk lean are associated with changes in self-reported PFP and hip and knee kinematics during single limb landing. Examine if and to what extent PFJRF reductions are related to changes in self-reported PFP.

Methods: Twenty-six active females (age: 23.4 ± 4.1 years) with PFP performed five single limb landing trials (0.25 m) using self-selected and forward trunk lean strategies. For each trial, kinematics, kinetics, and self-reported PFP were recorded. Dependent variables included pain, peak PFJRF, and PFJRF at varying knee flexion angles. Paired t-tests and Wilcoxon signed rank tests were calculated to examine the forward trunk lean effects on dependent variables. Spearman's rho was calculated to examine relationships between changes in PFJRF and self-reported PFP.

Results: Forward trunk lean led to increased peak PFJRF (mean difference (MD) = 16.15 N/kg; p < .05) and decreased PFJRF at knee flexion angles of 20 (MD = -5.73 N/kg; p < .001), 25 (MD = -7.67 N/kg; p < .001), and 30 degrees (MD = -6.86 N/kg; p < .001), but not 35 degrees (p > .05). The forward trunk lean also led to a 3-point median decrease in PFP (p < .05) and abolished pain in 18 of 26 participants, despite increased peak PFJRF. The PFJRF change at 25 degrees of knee flexion was significantly and positively related to changes in self-reported PFP (ρ = .44; p = .026).

Conclusions: For active females, increased forward trunk lean during single limb landing can improve PFP and reduce PFJRFs at small knee flexion angles, despite increased peak PFJRF. Additionally, greater decreases in the submaximal PFJRF at 25 degrees of knee flexion were associated with greater decreases in self-reported PFP during single limb landing.

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膝关节小屈曲角度髌骨股骨关节反作用力变化对运动女性单肢着地时髌骨股骨疼痛的影响。

背景：过度的髌股关节（PFJ）负荷被认为是髌股疼痛（PFP）发展的主要刺激因素。然而，对于PFJ负荷的变化如何影响活跃女性的PFP知之甚少，女性比男性更频繁受到影响。目的：研究躯干前倾引起的髌股关节反作用力（PFJRF）的变化是否与单肢着地时自我报告的PFP和髋关节和膝关节运动学的变化有关。检查PFJRF的减少是否和在多大程度上与自我报告的PFP的变化有关。方法：26名年龄23.4±4.1岁的活跃女性PFP患者，采用自主选择和躯干前倾策略进行5次单肢着陆试验（0.25 m）。对于每个试验，记录运动学、动力学和自我报告的PFP。因变量包括疼痛、PFJRF峰值和不同膝关节屈曲角度的PFJRF。计算配对t检验和Wilcoxon符号秩检验来检验前倾躯干对因变量的影响。计算Spearman的rho是为了检验PFJRF的变化和自我报告的PFP之间的关系。结果：躯干前倾导致PFJRF峰值升高(平均差值(MD) = 16.15 N/kg；p p p p > .05)。躯干前倾也导致PFP中位数下降3个点（p p = 0.026）。结论：对于有运动能力的女性，在单肢着地时增加躯干前倾可以改善PFP并降低小膝关节屈曲角度下的PFJRF，尽管PFJRF峰值会增加。此外，在膝关节屈曲25度时，次最大PFJRF的较大下降与单肢着地时自我报告的PFP的较大下降相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physiotherapy Theory and Practice REHABILITATION-

CiteScore

3.40

自引率

10.00%

发文量

300

期刊介绍： The aim of Physiotherapy Theory and Practice is to provide an international, peer-reviewed forum for the publication, dissemination, and discussion of recent developments and current research in physiotherapy/physical therapy. The journal accepts original quantitative and qualitative research reports, theoretical papers, systematic literature reviews, clinical case reports, and technical clinical notes. Physiotherapy Theory and Practice; promotes post-basic education through reports, reviews, and updates on all aspects of physiotherapy and specialties relating to clinical physiotherapy.