17
IRUS TotalDownloads
Altmetric
A cadaveric model to evaluate the effect of unloading the medial quadriceps on patellar tracking and patellofemoral joint pressure and stability
File | Description | Size | Format | |
---|---|---|---|---|
Stephen_A cadaveric model to evaluate_BMC.pdf | Published version | 1.06 MB | Adobe PDF | View/Open |
Title: | A cadaveric model to evaluate the effect of unloading the medial quadriceps on patellar tracking and patellofemoral joint pressure and stability |
Authors: | Stephen, J Alva, A Lumpaopong, P Williams, A Amis, AA |
Item Type: | Journal Article |
Abstract: | Background Vastus Medialis Muscles (VMM) damage has been widely identified following patellar dislocation. Rehabilitation programmes have been suggested to strengthen the VMM and reduce clinical symptoms of pain and instability. This controlled laboratory study investigated the hypothesis that reduced Vastus Medialis Obliquus (VMO) and Vastus Medialis Longus (VML) muscle tension would alter patellar tracking, stability and PFJ contact pressures. Methods Nine fresh-frozen dissected cadaveric knees were mounted in a rig with the quadriceps and iliotibial band loaded to 205 N. An optical tracking system measured joint kinematics and pressure sensitive film between the patella and trochlea measured PFJ contact pressures. Measurements were repeated for three conditions: 1. With all quadriceps heads and iliotibial band (ITB) loaded; 2. as 1, but with the VMO muscle unloaded and 3. as 1, but with the VMO and VML unloaded. Measurements were also repeated for the three conditions with a 10 N lateral displacement force applied to the patella. Results Reduction of VMM tension resulted in significant increases in lateral patellar tilt (2.8°) and translation (4 mm), with elevated lateral and reduced medial joint contact pressures from 0.48 to 0.14 MPa, and reduced patellar stability (all p < 0.05). Conclusions These findings provide basic scientific rationale to support the role of quadriceps strengthening to resist patellar lateral maltracking and rebalance the articular contact pressure away from the lateral facet in patients with normal patellofemoral joint anatomy. |
Issue Date: | 10-Sep-2018 |
Date of Acceptance: | 9-Aug-2018 |
URI: | http://hdl.handle.net/10044/1/63344 |
DOI: | https://dx.doi.org/10.1186/s40634-018-0150-8 |
ISSN: | 2197-1153 |
Publisher: | SpringerOpen |
Journal / Book Title: | Journal of Experimental Orthopaedics |
Volume: | 5 |
Copyright Statement: | © The Author(s). 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
Keywords: | Contact pressure Kinematics Muscle weakness Patellofemoral joint Vastus medialis |
Publication Status: | Published |
Article Number: | ARTN 34 |
Appears in Collections: | Mechanical Engineering Faculty of Engineering |