Quadriceps Strengths

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For individuals over the age of 50, osteoarthritis (OA) of the knee is the leading cause of chronic disability (Bruce-Brand). Neuromuscular electrical stimulation (NMES) is a commonly used modality in physical therapy practice for increasing the strength of muscles. There is no cure for OA, but quadriceps strength is highly correlated with functional performance of the knee and, therefore, increasing quadriceps strength may lead to improvements in knee performance and quality of life for those with OA. The purpose of this paper is to assess the effectiveness of NMES for quadriceps strengthening for individuals with advanced knee OA. The first of three research articles examined was conducted by Bruce-Brand et. al. In this randomized control …show more content…

Though the researchers found improved functional performance and quadriceps cross-sectional area (CSA) increased by 5.4%, there was no statically significant increase in quadriceps strength. Reasons why the NMES group demonstrated no significant improvement may have been due to the limited 18 mA max RMS output as well as the dynamic pulse width that likely was too short to attain a therapeutic dose when at its lower range. Furthermore, lack of supervision, the inability for specific pad placement, and not assessing the percentage of maximal voluntary isometric contraction (MVIC) attained during stimulation may have limited gains. Consistent with their results, the researchers concluded NMES did not produce meaningful strength gains but did increase CSA as well as improve functional performance 6 weeks after intervention for those with grades 3 to 4 …show more content…

While conducting the literature search for this paper, no studies examined the effects on only individuals with grade 4 OA. In fact, most studies excluded individuals that presented with grade 4 OA. Only one study included individuals just with grades 3-4 OA, but I believe their results were severely limited by the device used. Furthermore, no meta-analysis studies were applicable due to the vast inconsistencies in treatment protocols and outcome assessments. There is a need for larger scale RCTs specifically assessing the short and long term effectiveness for those with grade 3 to 4 OA using adequate parameters and dosage for strengthening. From the studies included in this paper as well as what I have learned in class, NMES for quadriceps strengthening may be a good option for those who exhibit deficient activation, excessive weakness, or in which exercise is contraindicated, given that the patient can tolerate a therapeutic dose. Besides the strength assessments, all three studies included used the Western Ontario McMaster Universities Ostearthritis index (WOMAC) as well as functional tests involving timed walks, sit-to-stands, and stair climbs as outcome measures. Even though strength gains were not consistent from study to study, all three demonstrated improvements in WOMAC scores and functional performance. It is my

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