Article

Despite the growing recognition of the role of abnormal hip and knee
mechanics in patellofemoral pain (PFP), few studies have assessed if or how these
mechanics change when the person experiences pain while running. Therefore, the
purpose of this study was to determine if the development of pain while running
resulted in altered hip and knee kinematics in female runners with PFP as
compared to healthy female runners. METHODS: Thirty female runners (15 PFP, 15
controls) participated in an instrumented gait analysis while running for 30 min
at a self-selected pace. Pain and fatigue were recorded every minute while
participants ran. Variables of interest included peak hip adduction, hip internal
rotation, knee abduction, knee external rotation, pain, and fatigue. RESULTS:
There were significant group by pain interactions for hip adduction (p<0.01) and
hip internal rotation (p<0.01). The healthy group, who did not develop pain had
significant increases in both motions compared to the PFP group, who did develop
pain. There was also a trend toward less knee external rotation in the PFP group
in presence of pain (p=0.059). No differences were found for knee abduction
(p=0.32). A group main effect was found for hip internal rotation (p=0.008) in
which the PFP group had significantly larger values. CONCLUSION: Runners with PFP
did not alter their hip mechanics over the course of the run. This may have
resulted in repetitive stress to the same aspect of the patellofemoral joint and
contributed to the initial development of pain. However, the PFP group did
attempt to make a compensation once in pain by reducing knee external rotation.
CI - Copyright (c) 2012 Elsevier B.V. All rights reserved.

Langue : ANGLAIS