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IJTRR. 2016; 5(5): 149-156

Efficacy of Neuromuscular Electrical Stimulation on Vastus Medialis Obliqus in Patellofemoral Pain Syndrome: A Double Blinded Randomized Controlled Trail

Rajesh Kumar Das, Komal Malik, Bibhuti Sarkar, Sourov Saha, Abhishek Biswas.

Background: Neuromuscular Electrical Stimulation (NEMS) had found to be an effective treatment intervention for improving functional abilities in many neurological conditions. But, there is lack of literature about the role of NMES in Patellofemoral Pain Syndrome (PFPS) and existing studies show contradictory results.
Objectives: To evaluate the effects of NEMS on early Vastus Medialis Obliqus (VMO) activation in PFPS.
Methods: Total 30 subjects with PFPS were randomized into Group-A with NEMS and supervised exercise program and Group- B with supervised exercise program only. NMES used in this study was a single channel pre-programmed portable stimulator, which supplies biphasic symmetric rectangular pulses with pulse duration 20-1000 ╬╝sec, frequency 30-75 pulses per sec, time on: off 10:50 sec for 30 minutes. Outcome measures were - Visual Analogue Scale (VAS) for pain intensity during activities, Kujala Score for functional disability, Maximum Voluntary Isometric Contraction (MVIC) for muscle strength and Electromyography (EMG) for level of VMO: VL muscle activation. These parameters were measured at zero week (baseline data), 4th week (post-treatment) and 5th week (follow up).
RESULTS: Group- A (NMES) showed more improvement than Group-B in VAS, Kujala Score, VMO: VL ratio and MVIC at post treatment and follow up with significance value p< 0.05.
CONCLUSION: NEMS was found to be effective by decreasing pain and functional disability and improving muscle strength and activation of VMO in subjects with PFPS.

Key words: Neuromuscular Electrical Stimulation (NEMS), Patellofemoral Pain Syndrome (PFPS), Vastus Medialis Obliqus (VMO) activation, Maximum Voluntary Isometric Contraction (MVIC), Electromyography (EMG)

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