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Impact loading following quadriceps strength training in individuals with medial knee osteoarthritis and varus alignment

journal contribution
posted on 18.05.2018, 00:00 by Crystal KeanCrystal Kean, RS Hinman, TV Wrigley, BW Lim, KL Bennell
Background Greater impact loading at initial contact is postulated to play a role in the progression of osteoarthritis. Quadriceps weakness is common in individuals with knee osteoarthritis and may contribute to high impact loading. The purpose of this study was to examine the effects of quadriceps strengthening on impact loading parameters. Methods Data from 97 individuals with knee osteoarthritis who participated in a randomized clinical trial examining effects of a 12-week quadriceps strengthening program was used to conduct this secondary exploratory analysis. Participants completed a three-dimensional gait assessment within 10% of 1.0 m/s from which maximum rate of loading (Body Weight/second), average rate of loading (Body Weight/second), and peak vertical ground reaction force during early stance (Body Weight) were determined. Peak isometric quadriceps strength (Nm/kg) was also assessed. Findings There was a significant increase in quadriceps strength in the training group (mean change (95%CI): 0.35(0.25, 0.045) Nm/kg, P = 0.01) with no change in the control group (mean change (95%CI): 0.03(− 0.39, 0.45) Nm/kg, P  >  0.05). There were no changes in impact loading variables. With data from both groups combined, changes in quadriceps strength explained 3% of var iance in the change in maximum rate of loading. Change in quadriceps strength was not predictive of the change in peak vertical ground reaction force or average rate of loading. Interpretations While change in strength was predictive of change in maximal loading rate, this explained only a small proportion of the variance. Future research examining the role parameters such as neuromuscular control play in impact loading are warranted. © 2017

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

42

Start Page

20

End Page

24

Number of Pages

5

eISSN

1879-1271

ISSN

0268-0033

Peer Reviewed

Yes

Open Access

No

Acceptance Date

03/01/2017

External Author Affiliations

The University of Melbourne; Republic Polytechnic, Singapore

Era Eligible

Yes

Journal

Clinical Biomechanics