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Quadriceps femoris muscle weakness and activation failure in patients with symptomatic knee osteoarthritis
Author(s) -
Lewek Michael D.,
Rudolph Katherine S.,
SnyderMackler Lynn
Publication year - 2004
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1016/s0736-0266(03)00154-2
Subject(s) - isometric exercise , osteoarthritis , weakness , medicine , physical medicine and rehabilitation , muscle weakness , physical therapy , rehabilitation , quadriceps muscle , surgery , pathology , alternative medicine
Abstract Purpose : Quadriceps weakness is common in patients with knee osteoarthritis (OA), and has been attributed to failure of voluntary activation. Methodological differences may have contributed to previous reports of extensive failure of voluntary activation in patients with osteoarthritis. The purpose of this study was to determine the extent of quadriceps muscle weakness and activation failure in middle aged patients with symptomatic medial knee osteoarthritis using maximum voluntary isometric contractions (MVIC) and a burst superimposition technique. Methods : Measurements of quadriceps MVIC and extent of voluntary activation were made in 12 subjects with knee OA and 12 similarly aged uninjured subjects. Voluntary activation was tested by superimposing a train of electrical stimulation on a maximal effort volitional contraction of the quadriceps muscle. Results : The group of subjects with knee OA had significantly less quadriceps strength relative to body mass index (BMI) than the group of control subjects ( p = 0.010). No difference in voluntary activation was observed ( p = 0.233), however, 50% of the OA group, and only 25% of the control group failed to fully activate the quadriceps. Discussion : The finding of quadriceps weakness is consistent with past literature. Providing adequate instruction, feedback, and several attempts to maximally contract the muscle likely yielded greater volitional activation (thus less activation failure) than had been reported previously. This finding has implications for the rehabilitation of weakened quadriceps in patients with knee osteoarthritis. © 2003 Orthopaedic Research Society. Published by Elsevier Ltd. All rights reserved.