Journal article
Factors explaining chronic knee extensor strength deficits after ACL reconstruction
Journal of orthopaedic research, v 29(5), pp 633-640
May 2011
PMID: 21246615
Abstract
Persistent quadriceps muscle weakness is common after anterior cruciate ligament (ACL) reconstruction. The mechanisms underlying these chronic strength deficits are not clear. This study examined quadriceps strength in people 2-15 years post-ACL reconstruction and tested the hypothesis that chronic quadriceps weakness is related to levels of voluntary quadriceps muscle activation, antagonistic hamstrings moment, and peripheral changes in muscle. Knee extensor strength and activation were evaluated in 15 ACL reconstructed and 15 matched uninjured control subjects using an interpolated triplet technique. Electrically evoked contractile properties were used to evaluate peripheral adaptations in the quadriceps muscle. Antagonistic hamstrings moments were predicted using a practical mathematical model. Knee extensor strength and evoked torque at rest were significantly lower in the reconstructed legs (p < 0.05). Voluntary activation and antagonistic hamstrings activity were similar across legs and between groups (p > 0.05). Regression analyses indicated that side-to-side differences in evoked torque at rest explained 71% of the knee extensor strength differences by side (p < 0.001). Voluntary activation and antagonistic hamstrings moment did not contribute significantly (p > 0.05). Chronic quadriceps weakness in this sample was primarily related to peripheral changes in the quadriceps muscle, not to levels of voluntary activation or antagonistic hamstrings activity.
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Details
- Title
- Factors explaining chronic knee extensor strength deficits after ACL reconstruction
- Creators
- Chandramouli Krishnan - Shirley Ryan AbilityLabGlenn N Williams - University of Iowa
- Publication Details
- Journal of orthopaedic research, v 29(5), pp 633-640
- Publisher
- Wiley
- Grant note
- K12 HD055931 / NICHD NIH HHS K12 HD055931-03 / NICHD NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physical Therapy (and Rehabilitation Sciences)
- Web of Science ID
- WOS:000289425100001
- Scopus ID
- 2-s2.0-79952816701
- Other Identifier
- 991021887607804721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Orthopedics