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Changes in landing mechanics in patients following anterior cruciate ligament reconstruction when wearing an extension constraint knee brace.

dc.contributor.author Butler, Robert J
dc.contributor.author Dai, Boyi
dc.contributor.author Garrett, William E
dc.contributor.author Queen, Robin M
dc.coverage.spatial United States
dc.date.accessioned 2014-06-20T01:33:09Z
dc.date.accessioned 2014-06-20T01:38:18Z
dc.date.issued 2014-05
dc.identifier http://www.ncbi.nlm.nih.gov/pubmed/24790689
dc.identifier 10.1177_1941738114524910
dc.identifier.issn 1941-7381
dc.identifier.uri https://hdl.handle.net/10161/8891
dc.description.abstract BACKGROUND: Anterior cruciate ligament (ACL) reconstruction is associated with a high incidence of second tears (graft tears and contralateral ACL tears). These secondary tears have been attributed to asymmetrical lower extremity mechanics. Knee bracing is one potential intervention that can be used during rehabilitation that has the potential to normalize lower extremity asymmetry; however, little is known about the effect of bracing on movement asymmetry in patients following ACL reconstruction. HYPOTHESIS: Wearing a knee brace would increase knee joint flexion and joint symmetry. It was also expected that the joint mechanics would become more symmetrical in the braced condition. OBJECTIVE: To examine how knee bracing affects knee joint function and symmetry over the course of rehabilitation in patients 6 months following ACL reconstruction. STUDY DESIGN: Controlled laboratory study. LEVEL OF EVIDENCE: Level 3. METHODS: Twenty-three adolescent patients rehabilitating from ACL reconstruction surgery were recruited for the study. The subjects all underwent a motion analysis assessment during a stop-jump activity with and without a functional knee brace on the surgical side that resisted extension for 6 months following the ACL reconstruction surgery. Statistical analysis utilized a 2 × 2 (limb × brace) analysis of variance with a significant alpha level of 0.05. RESULTS: Subjects had increased knee flexion on the surgical side when they were braced. The brace condition increased knee flexion velocity, decreased the initial knee flexion angle, and increased the ground reaction force and knee extension moment on both limbs. Side-to-side asymmetry was present across conditions for the vertical ground reaction force and knee extension moment. CONCLUSION: Wearing a knee brace appears to increase lower extremity compliance and promotes normalized loading on the surgical side. CLINICAL RELEVANCE: Knee extension constraint bracing in postoperative ACL patients may improve symmetry of lower extremity mechanics, which is potentially beneficial in progressing rehabilitation and reducing the incidence of second ACL tears.
dc.language eng
dc.publisher SAGE Publications
dc.relation.ispartof Sports Health
dc.relation.isversionof 10.1177/1941738114524910
dc.relation.replaces http://hdl.handle.net/10161/8890
dc.relation.replaces 10161/8890
dc.subject biomechanics
dc.subject function
dc.subject jump
dc.subject knee injury
dc.title Changes in landing mechanics in patients following anterior cruciate ligament reconstruction when wearing an extension constraint knee brace.
dc.type Journal article
duke.contributor.id Butler, Robert J|0535237
duke.contributor.id Garrett, William E|0068329
duke.contributor.id Queen, Robin M|0333217
pubs.author-url http://www.ncbi.nlm.nih.gov/pubmed/24790689
pubs.begin-page 203
pubs.end-page 209
pubs.issue 3
pubs.organisational-group Clinical Science Departments
pubs.organisational-group Duke
pubs.organisational-group Faculty
pubs.organisational-group Orthopaedics
pubs.organisational-group Orthopaedics, Physical Therapy
pubs.organisational-group School of Medicine
pubs.publication-status Published
pubs.volume 6


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