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Vastus Lateralis : Vastus Medialis Activation Ratio Correlates with Vastus Medialis Activation Delay and Patellar Maltracking in Patellofemoral Pain Patients 1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pal, Saikat Besier, Thor F. Draper, Christine E. Fredericson, Michael Gold, G. E. Beaupré, Gary S. Delp, Scott L. |
| Copyright Year | 2011 |
| Abstract | Vasti muscle activation imbalance is considered a common cause for patellar maltracking in patellofemoral pain (PFP) subjects. Vasti activation imbalance can be evaluated by measuring vastus medialis (VM) activation delay compared to vastus lateralis (VL) activation [1], and normalized VL:VM activation ratio [2]. Measurement of VM activation delay during functional tasks such as walking or running requires synchronization of electromyography (EMG) data with joint kinematics and ground reaction forces (GRF) [1]. These measurements are impractical in most clinical settings. However, VL:VM activation ratio can be obtained by simply placing surface electrodes on a patient while performing the functional tasks during clinical evaluation, and may be a surrogate measure for VM activation delay. The first aim of this study was to investigate the relationship between VL:VM activation ratio and VM activation delay in PFP subjects and pain-free controls. Next, evidence relating VL:VM activation ratio to patellar maltracking is sparse. The second aim was to investigate the relationship between VL:VM activation ratio and patellar maltracking measured under upright, weightbearing conditions. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.asbweb.org/conferences/2011/pdf/309.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
