Drs. Bennell and Hinman and Mr. Wrigley will receive royalties from Asics Oceania Pty., Ltd. if the shoe is commercialized.
Effects of a modified shoe on knee load in people with and those without knee osteoarthritis
Version of Record online: 25 FEB 2013
Copyright © 2013 by the American College of Rheumatology
Arthritis & Rheumatism
Volume 65, Issue 3, pages 701–709, March 2013
How to Cite
Bennell, K. L., Kean, C. O., Wrigley, T. V. and Hinman, R. S. (2013), Effects of a modified shoe on knee load in people with and those without knee osteoarthritis. Arthritis & Rheumatism, 65: 701–709. doi: 10.1002/art.37788
- Issue online: 25 FEB 2013
- Version of Record online: 25 FEB 2013
- Accepted manuscript online: 30 NOV 2012 03:22PM EST
- Manuscript Accepted: 1 NOV 2012
- Manuscript Received: 30 JUN 2012
- National Health and Medical Research Council. Grant Number: 631717
- Australian Research Council. Grant Number: linkage grant LP0990671
- Asics Oceania Pty., Ltd.
- Australian Research Council Future Fellowship. Grant Number: FT0991413
To evaluate the effects of a modified shoe that incorporates both lateral wedging and a variable-stiffness sole on knee joint loading in 3 populations: individuals with symptomatic and radiographic knee osteoarthritis (OA), asymptomatic overweight individuals, and asymptomatic healthy weight individuals.
Ninety participants (30 per group) underwent a 3-dimensional gait analysis across 3 test conditions: modified shoes, standard control shoes, and barefoot. For each condition, the first peak knee adduction moment (KAM) and knee flexion moment (KFM) (both expressed as Nm/[body weight × height]%) as well as the KAM impulse (expressed as Nm.s/[body weight × height]%) were determined.
The modified shoes significantly reduced the peak KAM as compared to the control shoes in both the OA (P = 0.002) and the overweight (P = 0.03) groups. In the OA group, there was no significant difference in peak KAM when walking in the modified shoe as compared to walking barefoot. In the overweight and the healthy weight groups, the peak KAM when walking in the modified shoe was significantly higher than that when walking barefoot (P < 0.001). Irrespective of group, the KAM impulse was significantly reduced when walking in the modified shoe as compared to the control shoe (P < 0.001) and was significantly higher during both shoe conditions as compared to walking barefoot (P < 0.001). There was no change in the KFM between walking conditions for any group.
The findings illustrate that a shoe incorporating both a lateral wedge and a variable-stiffness sole can significantly reduce medial knee joint load. Further research examining the effects of these shoes on pain, function, and structural changes in the joint is warranted.