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Effect of Magnetic Knee Wrap on Quadriceps Strength in Patients With Symptomatic Knee Osteoarthritis

  • Chung-Yao Chen
    Correspondence
    Reprint requests to Chung-Yao Chen, MD, Dept of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Keelung, No 222, Maijin Rd, Anle District, Keelung City 204, Taiwan
    Affiliations
    Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Keelung, Taiwan

    Department of Physical Therapy, College of Medicine, Chang Gung University, Taoyuan, Taiwan
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  • Chia-Ling Chen
    Affiliations
    Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Taoyuan, Taiwan

    Department of Physical Therapy, College of Medicine, Chang Gung University, Taoyuan, Taiwan
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  • Steele Chih-Chin Hsu
    Affiliations
    Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Keelung, Taiwan

    Department of Physical Therapy, College of Medicine, Chang Gung University, Taoyuan, Taiwan
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  • Shih-Wei Chou
    Affiliations
    Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Taoyuan, Taiwan

    Department of Physical Therapy, College of Medicine, Chang Gung University, Taoyuan, Taiwan
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  • Kun-Chung Wang
    Affiliations
    Department of Orthopaedics, Chang Gung Memorial Hospital, Keelung, Taiwan

    Department of Physical Therapy, College of Medicine, Chang Gung University, Taoyuan, Taiwan
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Published:November 03, 2008DOI:https://doi.org/10.1016/j.apmr.2008.05.019

      Abstract

      Chen C-Y, Chen C-L, Hsu SC-C, Chou S-W, Wang K-C. Effect of magnetic knee wrap on quadriceps strength in patients with symptomatic knee osteoarthritis.

      Objective

      To determine the effects of magnetic knee wrap on isokinetic quadriceps strength in patients with painful knee osteoarthritis (OA).

      Design

      Randomized, double-blinded, placebo-controlled and before-after trial.

      Setting

      Rehabilitation clinic in a tertiary hospital.

      Participants

      Eligible patients (N=50) (mean age ± SD, 66.0±8.6y) with mild to moderate knee OA were recruited from the outpatient department and 37 (74%) completed the trial. Only 3 (6%) withdrew due to study-related adverse effects.

      Interventions

      Wearing the active (n=24) or sham (n=26) magnetic knee wrap for 12 weeks.

      Main Outcome Measures

      The primary outcome measure was isokinetic quadriceps strength. Secondary outcome measures included the Health Assessment Questionnaire Disability Index (HAQ-DI) and the Health Assessment Questionnaire (HAQ) Pain Scale.

      Results

      Using intention-to-treat analyses, the peak isokinetic quadriceps strength increased significantly in the treated leg at 30°/s (P=.007) and 60°/s (P=.022) after wearing the magnetic knee wrap. Compared with baseline, the median strength increase for the treated leg in the study group significantly exceeded that in the control group at week 4 (.05Nm/kg vs −.09Nm/kg at 60°/s, P=.038) and week 12 (30°/s, .09Nm/kg vs .04Nm/kg, P=.044; 60°/s, .17Nm/kg vs .02Nm/kg, P=.031). The HAQ-DI and HAQ Pain Scales improved significantly in both groups. Compared with baseline, the improvement at week 12 in terms of the HAQ-DI in the study group significantly exceeded that in the control group.

      Conclusions

      Magnetic knee wrap may significantly facilitate isokinetic quadriceps strength in patients with mild to moderate knee OA.

      Key Words

      List of Abbreviations:

      AMI (arthrogenous muscle inhibition), CV (coefficient of variation), ES (effect size), HAQ (Health Assessment Questionnaire), HAQ-DI (Health Assessment Questionnaire Disability Index), ITT (intention-to-treat), IQR (interquartile range), mT (mTesla), NSAID (nonsteroidal anti-inflammatory drug), OA (osteoarthritis), ROM (range of motion), SMF (static magnetic field), VAS (visual analog scale), WOMAC (Western Ontario and McMaster Universities Osteoarthritis Index)
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