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Comparison of the effect of sensory-level and conventional motor-level neuromuscular electrical stimulations on quadriceps strength after total knee arthroplasty: a prospective randomized single-blind trial
Yoshida Y, Ikuno K, Shomoto K
Archives of Physical Medicine and Rehabilitation 2017 Dec;98(12):2364-2370
clinical trial
7/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVE: To compare sensory-level neuromuscular electrical stimulation (NMES) and conventional motor-level NMES in patients after total knee arthroplasty. DESIGN: Prospective randomized single-blind trial. SETTING: Hospital total arthroplasty center: inpatients. PARTICIPANTS: Patients with osteoarthritis (n = 66; mean age 73.5 +/- 6.3y; 85% women) were randomized to receive either sensory-level NMES applied to the quadriceps (the sensory-level NMES group), motor-level NMES (the motor-level NMES group), or no stimulation (the control group) in addition to a standard rehabilitation program. INTERVENTIONS: Each type of NMES was applied in 45-minute sessions, 5d/wk, for 2 weeks. MAIN OUTCOME MEASURES: Data for the quadriceps maximum voluntary isometric contraction, the leg skeletal muscle mass determined using multiple-frequency bioelectrical impedance analysis, the timed Up and Go test, the 2-minute walk test, the visual analog scale, and the range of motion of the knee were measured preoperatively and at 2 and 4 weeks after total knee arthroplasty. RESULTS: The motor-level NMES (p = 0.001) and sensory-level NMES (p = 0.028) groups achieved better maximum voluntary isometric contraction results than did the control group. The motor-level NMES (p = 0.003) and sensory-level NMES (p = 0.046) groups achieved better 2-minute walk test results than did the control group. Some patients in the motor-level NMES group dropped out of the experiment because of discomfort. CONCLUSIONS: Motor-level NMES significantly improved muscle strength and functional performance more than did the standard program alone. Motor-level NMES was uncomfortable for some patients. Sensory-level NMES was comfortable and improved muscle strength and functional performance more than did the standard program alone.

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