Altering Knee Abduction Angular Impulse Using Wedged Insoles for Treatment of Patellofemoral Pain in Runners: A Six-Week Randomized Controlled Trial

作者：Lewinson Ryan T^*; Wiley J Preston; Humble R Neil; Worobets Jay T; Stefanyshyn Darren J

来源：PLos One, 2015, 10(7): e0134461.

DOI：10.1371/journal.pone.0134461

Objective
Determine if a change in internal knee abduction angular impulse (KAAI) is related to pain reduction for runners with patellofemoral pain (PFP) by comparing lateral and medial wedge insole interventions, and increased KAAI and decreased KAAI groups.
Design
Randomized controlled clinical trial (ClinicalTrials. gov ID# NCT01332110).
Setting
Biomechanics laboratory and community.
Patients
Thirty-six runners with physician-diagnosed PFP enrolled in the trial, and 27 were analyzed.
Interventions
Runners with PFP were randomly assigned to either an experimental 3 mm lateral wedge or control 6 mm medial wedge group. Participants completed a biomechanical gait analysis to quantify KAAIs with their assigned insole, and then used their assigned insole for six-weeks during their regular runs. Usual pain during running was measured at baseline and at six-week follow-up using a visual analog scale. Statistical tests were performed to identify differences between wedge types, differences between biomechanical response types (i.e. increase or decrease KAAI), as well as predictors of pain reduction.
Main Outcome Measures
Percent change in KAAI relative to neutral, and % change in pain over six weeks.
Results
Clinically meaningful reductions in pain (>33%) were measured for both footwear groups; however, no significant differences between footwear groups were found (p = 0.697). When participants were regrouped based on KAAI change (i.e., increase or decrease), again, no significant differences in pain reduction were noted (p = 0.146). Interestingly, when evaluating absolute change in KAAI, a significant relationship between absolute% change in KAAI and % pain reduction was observed (R-2 = 0.21; p = 0.030), after adjusting for baseline pain levels.
Conclusion
The greater the absolute % change in KAAI during running, the greater the % reduction in pain over six weeks, regardless of wedge type, and whether KAAIs increased or decreased. Lateral and medial wedge insoles were similar in effectiveness for treatment of PFP.

• 出版日期2015-7-31