| The effect of functional knee bracing on the anterior cruciate ligament in the weightbearing and nonweightbearing knee. | |
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MedLine Citation:
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PMID: 9167816 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We investigated the effect of functional bracing on anterior cruciate ligament strain in humans by arthroscopic implantation of a differential variable reluctance transducer on the ligament and measurement of its strain behavior. Strains were measured while "injury mechanism" loads were applied to the weightbearing and nonweightbearing knees for both braced and unbraced conditions. For the unbraced knee, there was a significant increase in ligament strain values when subjects went from a seated position (minimal shear and compressive loads across the knee) to a standing posture (substantial shear and compressive loads across the knee). Similar strain values were found between these same seated and standing postures when a 140-N anterior-directed load was applied to the tibia. This indicates that the ligament is strained during weightbearing and demonstrates that the compressive load across the knee produced during weightbearing does not significantly reduce ligament strain values in comparison with the unweighted joint with relaxed muscles for the 140-N load limit of our anterior shear test. Bracing produced a protective effect on the ligament by significantly reducing the strain values for anterior-directed loading of the tibia up to 140 N with the knee in both weightbearing and nonweightbearing conditions. Likewise, bracing produced a protective effect on the ligament by significantly reducing strain values in response to internal-external torque of the tibia up to 6 N-m with the knee nonweightbearing. The brace strap that contacts the tibia just distal to the insertion of the patellar tendon was instrumented with a load sensor, allowing us to measure the posterior-directed loads applied by the brace to the tibia. Adjustment of strap tension between low and high settings did not modulate the protective effect of the brace on the ligament. |
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Authors:
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B D Beynnon; R J Johnson; B C Fleming; G D Peura; P A Renstrom; C E Nichols; M H Pope |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The American journal of sports medicine Volume: 25 ISSN: 0363-5465 ISO Abbreviation: Am J Sports Med Publication Date: 1997 May-Jun |
Date Detail:
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Created Date: 1997-07-18 Completed Date: 1997-07-18 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 7609541 Medline TA: Am J Sports Med Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 353-9 Citation Subset: IM |
Affiliation:
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Department of Orthopaedics and Rehabilitation, McClure Musculoskeletal Research Center, University of Vermont College of Medicine, Burlington 05405-0084, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anterior Cruciate Ligament* / injuries, physiology Arthroscopy Biomechanics Braces* Female Humans Knee Injuries / physiopathology*, therapy Knee Joint / physiology* Male Middle Aged Orthopedic Fixation Devices* Weight-Bearing |
| Grant Support | |
ID/Acronym/Agency:
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R01 AR 39213/AR/NIAMS NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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