Influences on knee movement strategies during walking in persons with medial knee osteoarthritis
Article first published online: 30 JUL 2007
Copyright © 2007 by the American College of Rheumatology
Arthritis Care & Research
Volume 57, Issue 6, pages 1018–1026, 15 August 2007
How to Cite
SchmitT, L. C. and Rudolph, K. S. (2007), Influences on knee movement strategies during walking in persons with medial knee osteoarthritis. Arthritis & Rheumatism, 57: 1018–1026. doi: 10.1002/art.22889
- Issue published online: 30 JUL 2007
- Article first published online: 30 JUL 2007
- Manuscript Accepted: 11 JAN 2007
- Manuscript Received: 20 JUN 2006
- NIH. Grant Numbers: P20-RR016458, T32-HR7490
- Foundation for Physical Therapy Promotion of Doctoral Studies Program
- Knee stability;
- Muscle activity;
To investigate the movement and muscle activation strategies during walking of individuals with medial knee osteoarthritis (OA) to determine the influence of quadriceps strength, medial knee laxity, limb alignment, and self-reported knee instability on knee motion.
Twenty-eight persons with medial knee OA and 26 control subjects participated. Quadriceps strength, medial knee laxity, and limb alignment were measured. Knee instability (IKOS score) was assessed with the Activities of Daily Living Scale of the Knee Outcome Survey. Knee motion and muscle activation patterns were measured with motion analysis. Group differences were detected with independent samples t-tests and predictive relationships were determined with linear and hierarchical regression analyses.
Individuals with OA were weaker, had greater medial knee laxity, and had more varus alignment. The OA group used less knee motion and higher muscle co-contraction during weight acceptance and single-limb support. Quadriceps strength and IKOS score significantly strengthened the prediction of knee motion during weight acceptance and single-limb support, whereas limb alignment and medial laxity did not.
The knee stiffening and higher muscle co-contraction used by the OA group may be detrimental to joint integrity. IKOS scores predicted knee motion after accounting for quadriceps strength, underscoring the importance of addressing knee instability with appropriate rehabilitation strategies in persons with medial knee OA in order to promote long-term joint integrity.