Patellofemoral joint compression forces in backward and forward running

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• 作者：Paulien E. Roos^a ; ^b ; ^{RoosPE@Cardiff.ac.uk} ; Nick Barton^c ; Robert W.M. van Deursen^a ; ^b
• 关键词：|GRF| ; magnitude of the ground reaction force ; BR ; backward running ; COPloc ; location of the ground reaction force relative to the foot ; COPlocFS ; position of the center of pressure relative to the foot at foot strike ; dPT ; patellar tendon moment arm ; Fq
• 刊名：Journal of Biomechanics
• 出版年：2012
• 期刊代码：144_00219290
• 类别：med
• 出版时间：1 June, 2012
• 卷：45
• 期：9
• 页码：1656-1660
• 文件大小：373 K

摘要

Patellofemoral pain (PFP) is a common injury and increased patellofemoral joint compression forces (PFJCF) may aggravate symptoms. Backward running (BR) has been suggested for exercise with reduced PFJCF.

The aims of this study were to (1) investigate if BR had reduced peak PFJCF compared to forward running (FR) at the same speed, and (2) if PFJCF was reduced in BR, to investigate which biomechanical parameters explained this. It was hypothesized that (1) PFJCF would be lower in BR, and (2) that this would coincide with a reduced peak knee moment caused by altered ground reaction forces (GRFs).

Twenty healthy subjects ran in forward and backward directions at consistent speed. Kinematic and ground reaction force data were collected; inverse dynamic and PFJCF analyses were performed.

PFJCF were higher in FR than BR (4.5卤1.5; 3.4卤1.4BW; p<0.01). The majority of this difference (93.1%) was predicted by increased knee moments in FR compared to BR (157卤54; 124卤51 Nm; p<0.01). 54.8%of differences in knee moments could be predicted by the magnitude of the GRF (2.3卤0.3; 2.4卤0.2BW), knee flexion angle (44卤6; 41卤7) and center of pressure location on the foot (25卤11; 12卤6%) at time of peak knee moment. Results were not consistent in all subjects.

It was concluded that BR had reduced PFJCF compared to FR. This was caused by an increased knee moment, due to differences in magnitude and location of the GRF vector relative to the knee. BR can therefore be used to exercise with decreased PFJCF.