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Effects of Leg-Press Training With Moderate Vibration on Muscle Strength, Pain, and Function After Total Knee Arthroplasty: A Randomized Controlled Trial

Published:January 04, 2016DOI:https://doi.org/10.1016/j.apmr.2015.12.015

      Highlights

      • Muscle weakness and functional impairments often persist for years after total knee arthroplasty.
      • Untrained women, older people with knee osteoarthritis, and patients after total knee arthroplasty achieve improvements of knee muscle strength through whole-body vibration training and progressive resistance training.
      • Both functional physiotherapy and leg-press training with moderate vibrations are effective in improving strength and function in patients after total knee arthroplasty.
      • Leg-press training involving moderate vibration is a safe, effective, and time-saving procedure in restoring muscle strength and functional capacity shortly after total knee arthroplasty.

      Abstract

      Objectives

      To examine the effects of a time-saving leg-press training program with moderate vibration on strength parameters, pain, and functional outcomes of patients after total knee arthroplasty (TKA) in comparison with functional physiotherapy.

      Design

      Randomized controlled trial.

      Setting

      Outpatient rehabilitation department at a university teaching hospital.

      Participants

      Patients (N=55) with TKA were randomly allocated into 2 rehabilitation groups.

      Interventions

      Six weeks after TKA, participants either underwent isokinetic leg-press training combined with moderate vibration (n=26) of 15 minutes per session or functional physiotherapy (n=29) of 30 minutes per session. Both groups received therapy twice a week for a period of 6 weeks. Participants were evaluated at baseline (6wk after TKA) and after the 6-week rehabilitation program.

      Main Outcome Measures

      The main outcome measure was maximal voluntary contraction (MVC) of the involved leg. Secondary outcome measures were pain assessed with a visual analog scale (VAS), range of motion, stair test, timed Up and Go test, and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC).

      Results

      Both groups showed statistically significant improvements in MVC of knee extensors measured on the knee dynamometer (leg-press group: from 0.8±.06 to 1±.09Nm/kg body weight [BW], physiotherapy group: from 0.7±.06 to 0.9±.06Nm/kg BW; P<.05) and in closed kinetic chain on the leg press (leg-press group: from 8.9±.77 to 10.3±1.06N/kg BW, physiotherapy group: from 6.7±.54 to 9.1±.70N/kg BW; P<.05) and in pain at rest (leg-press group: from 2±.36 to 1.3±.36 on the VAS, physiotherapy group: from 1.2±.28 to 1.1±.31; P<.05), WOMAC scores, and functional measurements after 6 weeks of training. There was no significant difference between the 2 groups concerning strength, pain, and functional outcomes after training (P>.05).

      Conclusions

      Isokinetic leg-press training with moderate vibration and functional physiotherapy are both effective in regaining muscle strength and function after TKA; however, isokinetic leg-press training is considerably less time consuming.

      Keywords

      List of abbreviations:

      BW (body weight), MVC (maximal voluntary contraction), ROM (range of motion), TKA (total knee arthroplasty), TUG (timed Up and Go), VAS (visual analog scale), WBV (whole-body vibration), WOMAC (Western Ontario and McMasters University Osteoarthritis Index)
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      Linked Article

      • Efficacy and Safety of Leg-Press Training With Moderate Vibration After Total Knee Arthroplasty Remains Unclear
        Archives of Physical Medicine and RehabilitationVol. 97Issue 11
        • Preview
          With great interest we read the article by Bily et al.1 We appreciate the effort of the study group to evaluate an innovatory method of rehabilitation after a total knee arthroplasty (TKA). This type of research is needed because of the lack of evidence-based rehabilitation programs after TKA. The topic of the study is also relevant with regard to the increasing rate of TKAs and the related growing financial burden to the health care system. However, we have some concerns about the study.
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