Background

Patellofemoral pain (PFP) is the most common running-related injury. Altered hip and knee kinematics and increases in weekly distance and running pace are often associated with PFP development and exacerbation.

Research question

Are altered movements and training load characteristics (weekly distance and running pace) relate to pain intensity or physical function level in runners with PFP?

Methods

Forty recreational runners with PFP (20 males and 20 females) participated in this cross-sectional observational study. Three-dimensional hip and knee kinematics were quantified during the stance phase of running. Weekly distance was defined as the average weekly kilometers of running and running pace as the average pace of the activity measured as minutes per kilometer. A visual analogue scale was used to evaluate worst knee pain during the last week. The anterior knee pain scale (AKPS) was used to evaluate knee functional score. A Pearson correlation matrix was used to investigate the association between each dependent variable (worst pain in the last week and AKPS score) and the independent variables (knee and hip kinematics, weekly distance and running pace).

Results

There was no significantly correlation between kinematic variables, pain and functional score for both males and females separately and combined. Weekly distance (km/week) was found to positively correlate to pain intensity (r = 0.452; p < 0.05) in females with PFP. A simple linear regression revealed that weekly distance was significant predictor emerged of pain in females with PFP. Females exhibited significantly greater peak hip adduction and hip adduction ROM than the males and males had significantly greater running pace compared to females.

Significance

Weekly distance should be considered in the clinical context during rehabilitation of PFP in females runners aiming at pain reduction.

中文翻译：

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Pat股骨疼痛跑步者的髋部和膝部运动学和训练负荷特性是否与疼痛强度和身体功能水平相关？

背景

ello股骨疼痛（PFP）是最常见的与跑步相关的损伤。髋部和膝部运动学的改变以及每周距离和跑步速度的增加通常与PFP的发展和加重有关。

研究问题

运动和训练负荷的变化（每周距离和跑步速度）是否与PFP运动员的疼痛强度或身体机能水平有关？

方法

40名具有PFP的休闲跑步者（20名男性和20名女性）参加了这项横断面观察研究。在跑步的站立阶段量化了三维髋和膝的运动学。每周距离定义为平均每周跑步和跑步速度公里数，而平均运动速度则以每公里分钟数来衡量。视觉模拟量表用于评估最后一周的严重膝关节疼痛。前膝关节疼痛量表（AKPS）用于评估膝关节功能评分。使用皮尔逊相关矩阵研究每个因变量（上周最严重的疼痛和AKPS评分）与自变量（膝盖和髋部运动学，每周距离和跑步速度）之间的关联。

结果

男性和女性分别和组合在一起的运动学变量，疼痛和功能评分之间无显着相关性。发现PFP女性的每周距离（km /周）与疼痛强度呈正相关（r = 0.452； p <0.05）。一个简单的线性回归表明，每周距离是PFP女性疼痛的重要预测指标。与男性相比，女性表现出明显更高的峰值内收和髋内收ROM，男性的步速明显更大。

意义

在旨在减轻疼痛的女子赛跑者中，PFP康复期间的临床情况下应考虑每周距离。