| Knee extensor dynamics in the volleyball approach jump: the influence of patellar tendinopathy. | |
| | |
MedLine Citation:
|
PMID: 20508329 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
STUDY DESIGN: Controlled laboratory study using a cross-sectional design. OBJECTIVES: To evaluate knee joint dynamics in elite volleyball players with and without a history of patellar tendinopathy, focusing on mechanical energy absorption and generation. We hypothesized that tendinopathy would be associated withreduced net joint work and net joint power. BACKGROUND: Patellar tendinopathy is a common, debilitating injury affecting competitive volleyball players. METHODS: Thirteen elite male players with and without a history of patellar tendinopathy (mean ± SD age, 27 ± 7 years) performed maximum-effort volleyball approach jumps. Sagittal plane knee joint kinematics, kinetics, and energetics were quantified in the lead limb, using data obtained from a force platform and an 8-camera motion analysis system. Vertical ground reaction forces and pelvis vertical velocity at takeoff were examined. Independent sample t tests were used to evaluate group differences (α = .05). RESULTS: The tendinopathy group, compared to controls, demonstrated significant reductions (approximately 30%) in net joint work and net joint power during the eccentric phase of the jump, with no differences in the concentric phase. Positive to-negative net joint work and net joint power ratios were significantly higher in the tendinopathy group, which had a net joint work ratio of 1.00 (95% CI: 0.77, 1.24) versus 0.76 (95% CI: 0.64, 0.88) for controls, and a net joint power ratio of 1.62 (95% CI: 1.15, 2.10) versus 1.00 (95% CI: 0.80, 1.21) for controls. There were no significant differences in net joint moment, angular velocity, or range of motion. Peak vertical ground reaction forces were lower for the tendinopathy group, while average vertical ground reaction forces and pelvis vertical velocity were similar. CONCLUSION: Patellar tendinopathy is associated with differences in sagittal plane mechanical energy absorption at the knee during maximum-effort volleyball approach jumps. Net joint work and net joint power may help define underlying mechanisms, adaptive effects, or rehabilitative strategies for individuals with patellar tendinopathy. |
| | |
Authors:
|
Shawn C Sorenson; Shruti Arya; Richard B Souza; Christine D Pollard; George J Salem; Kornelia Kulig |
Related Documents
:
|
18617179 - A mechanical supination sprain simulator for studying ankle supination sprain kinematics. 19171339 - Duration of strength retention of ankle taping during activities of daily living. 15134619 - Ankle and subtalar kinematics measured with intracortical pins during the stance phase ... 7120949 - Errors in the center and angle of rotation of a joint: an experimental study. 8663889 - Three-dimensional joint co-ordination strategies of the upper limb during functional ac... 11191609 - The hindlimb in walking horses: 2. net joint moments and joint powers. 19605309 - Characterization of catheter dynamics during percutaneous transluminal catheter procedu... 21996829 - Shaping the light transmission through a multimode optical fibre: complex transformatio... 22403349 - Adaptation of swallowing hyo-laryngeal kinematics is distinct in oral versus pharyngeal... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: The Journal of orthopaedic and sports physical therapy Volume: 40 ISSN: 0190-6011 ISO Abbreviation: J Orthop Sports Phys Ther Publication Date: 2010 Sep |
Date Detail:
|
Created Date: 2010-09-13 Completed Date: 2010-12-10 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7908150 Medline TA: J Orthop Sports Phys Ther Country: United States |
Other Details:
|
Languages: eng Pagination: 568-76 Citation Subset: IM |
Affiliation:
|
Jacqueline Perry Musculoskeletal Biomechanics Research Laboratory, University of Southern California, Los Angeles, CA, USA. sorenson@usc.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Biomechanics Case-Control Studies Cross-Sectional Studies Humans Knee Joint / physiology* Male Movement / physiology* Patellar Ligament / physiopathology* Sports / physiology* Tendinopathy / physiopathology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Predictors of falls in women with and without osteoporosis.
Next Document: Lumbar peritoneal shunt.