Electromechanical Delay of the Vastus Medialis Obliquus and Vastus Lateralis in Individuals With Patellofemoral Pain Syndrome
- 1 September 2012
- journal article
- Published by Journal of Orthopaedic & Sports Physical Therapy (JOSPT) in Journal of Orthopaedic & Sports Physical Therapy
- Vol. 42 (9), 791-796
- https://doi.org/10.2519/jospt.2012.3973
Abstract
Case-control study. To examine electromechanical delay (EMD) of the vastus medialis obliquus (VMO) and the vastus lateralis (VL) in individuals with patellofemoral pain syndrome (PFPS). EMD is a mechanical property of muscles related to protective reflex and sports performance. The time duration of the EMD can be shortened with strength training and, conversely, can be lengthened secondary to immobilization. However, it is unclear if EMD between various components of the quadriceps is affected in individuals with PFPS. Twenty-six individuals with PFPS and 26 healthy volunteers were studied. The VMO and VL were electrically stimulated to evoke muscle twitches. Ultrasound was used to assess patellar movement elicited by the muscle twitch. The time from the onset of electrical stimulation to the onset of patellar movement was measured as the EMD. The EMDs of the VMO and VL were compared between groups using a mixed-model analysis of variance. Subsequent to a significant interaction (P<.001), post hoc analysis indicated that the EMD of the VMO was longer (PFPS, 37.3 ± 0.7 milliseconds; control, 25.9 ± 0.7 milliseconds; P<.001) and the EMD of the VL was shorter (PFPS, 18.4 ± 0.5 milliseconds; control, 25.1 ± 0.5 milliseconds; P<.001) in the PFPS group. Therefore, in the individuals with PFPS, the EMD of the VMO was significantly longer than that of the VL (P<.001), which was not the case for those in the control group (P = .20). The mechanical properties of the VMO and VL may be altered in patients with PFPS.J Orthop Sports Phys Ther 2012;42(9):791-796, Epub 2 August 2012. doi:10.2519/jospt.2012.3973.Keywords
This publication has 29 references indexed in Scilit:
- Short-Term Effects of Hip Abductors and Lateral Rotators Strengthening in Females With Patellofemoral Pain Syndrome: A Randomized Controlled Clinical TrialJournal of Orthopaedic & Sports Physical Therapy, 2010
- Patellofemoral Pain Syndrome: Proximal, Distal, and Local Factors—International Research Retreat, April 30–May 2, 2009, Baltimore, MarylandJournal of Orthopaedic & Sports Physical Therapy, 2010
- Acute effects of passive stretching on the electromechanical delay and evoked twitch propertiesEuropean Journal of Applied Physiology, 2009
- A Novel Method for Measuring Electromechanical Delay of the Vastus Medialis Obliquus and Vastus LateralisJapanese Journal of Clinical Oncology, 2009
- Paired changes in electromechanical delay and musculo-tendinous stiffness after endurance or plyometric trainingEuropean Journal of Applied Physiology, 2008
- The relative timing of VMO and VL in the aetiology of anterior knee pain: a systematic review and meta-analysisBMC Musculoskeletal Disorders, 2008
- Electromechanical delay of the knee extensor muscles is not altered after harvesting the patellar tendon as a graft for ACL reconstruction: implications for sports performanceKnee Surgery, Sports Traumatology, Arthroscopy, 2005
- Physical Therapy for Patellofemoral PainThe American Journal of Sports Medicine, 2002
- Effects of knee joint angles and fatigue on the neuromuscular control of vastus medialis oblique and vastus lateralis muscle in humansEuropean Journal of Applied Physiology, 2001
- Electromechanical delay in human skeletal muscle under concentric and eccentric contractionsEuropean Journal of Applied Physiology, 1979