Neuromuscular alterations during walking in persons with moderate knee osteoarthritis

This paper compared the neuromuscular responses during walking between those with early-stage knee osteoarthritis (OA) to asymptomatic controls. The rationale for studying those with mild to moderate knee OA was to determine the alterations in response to dynamic loading that might be expected befor...

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Bibliographic Details
Published in:	Journal of electromyography and kinesiology Vol. 16; no. 4; pp. 365 - 378
Main Authors:	Hubley-Kozey, C.L., Deluzio, K.J., Landry, S.C., McNutt, J.S., Stanish, W.D.
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 01-08-2006
Subjects:	Adult Arthrography Case-Control Studies Electromyography Gait Humans Middle Aged Muscle, Skeletal - physiopathology Neuromuscular control patterns gait knee osteoarthritis pattern recognition Osteoarthritis, Knee - diagnostic imaging Osteoarthritis, Knee - physiopathology Retrospective Studies Walking Neuromuscular control patterns gait knee osteoarthritis pattern recognition
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Summary:	This paper compared the neuromuscular responses during walking between those with early-stage knee osteoarthritis (OA) to asymptomatic controls. The rationale for studying those with mild to moderate knee OA was to determine the alterations in response to dynamic loading that might be expected before severe pain, joint space narrowing and joint surface changes occur. We used pattern recognition techniques to explore both amplitude and shape changes of the surface electromyograms recorded from seven muscles crossing the knee joint of 40 subjects with knee OA and 38 asymptomatic controls during a walking task. The principal patterns for each muscle grouping explained over 83% of the variance in the waveforms. This result supported the notion that the main neuromuscular patterns were similar between asymptomatic controls and those with OA, reflecting the specific roles of the major muscles during walking. ANOVA revealed significant ( p < 0.05) differences in the principal pattern scores reflecting both amplitude and shape alterations in the OA group and among muscles. These differences captured subtle changes in the neuromuscular responses of the subjects with OA throughout different phases of the gait cycle and most likely reflected changes in the mechanical environment (joint loading, instability) and pain. The subjects with OA attempted to increase activity of the lateral sites and reduce activity in the medial sites, having minimal but prolonged activity during late stance. Therefore, alterations in neuromuscular responses were found even in this high functioning group with moderate knee OA.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1050-6411 1873-5711
DOI:	10.1016/j.jelekin.2005.07.014