Summary of: Wang C, Schmid CH, Hibberd PL, Kalish P, Roubenoff R, Rones R, et al (2009) Tai Chi is effective in treating knee osteoarthritis: a randomized controlled trial. Arthritis Care & Research 61: 1545-1553 [Prepared by Kare Birger Hagen and Margreth Grotle, CAP Editors.] Question: What is the...
Summary of: Wang C, Schmid CH, Hibberd PL, Kalish P, Roubenoff R, Rones R, et al (2009) Tai Chi is effective in treating knee osteoarthritis: a randomized controlled trial. Arthritis Care & Research 61: 1545-1553 [Prepared by Kare Birger Hagen and Margreth Grotle, CAP Editors.] Question: What is the effect of Tai Chi for people with osteoarthritis (OA) of the knee? Design: Randomised, controlled trial with concealed allocation, blinded outcome assessment and intention-to-treat analysis. Setting: An urban tertiary academic hospital in the USA. Participants: Men and women ≥ 55 years, with body mass index @? 40 kg/m2, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain subscale score > 40 mm, knee OA as defined by the American College of Rheumatology, and grade 2, 3, or 4 radiographic severity on the Kellgren-Lawrence classification. Prior Tai Chi training, recent intra-articular steroid or hyaluronate injections, and reconstructive surgery on the knee were exclusion criteria. Randomisation of 40 participants allotted 20 to the Tai Chi group and 20 to an attention control group. Interventions: Both groups participated in 60-minute sessions twice weekly for 12 weeks. The Tai Chi sessions included self-massage, movement, breathing technique, and relaxation. The participants were instructed to practise Tai Chi at least 20 minutes per day at home in the intervention period, and to continue this practice after the intervention period. The control group sessions included 40 minutes of didactic lessons with nutrition and medical information and 20 minutes of stretching exercises. Participants were instructed to practise at least 20 minutes of stretching exercises per day at home. Outcome measures: The primary outcome was change in the WOMAC pain subscale (range 0-500) at 12 weeks follow up. Secondary outcomes were WOMAC function subscale (0-1700), WOMAC stiffness subscale (0-200) assessed at 12, 24, and 48 weeks followup, and weekly WOMAC pain scores during the 12-week intervention period and at 24, and 48 weeks follow-up. Additional measures included patient and physician global assessment, physical performance tests, and psychological measures of health-related quality of life, depression, and self-efficacy. Results: All 40 participants completed the study. At 12 weeks, the mean reduction in WOMAC pain rating in the Tai Chi group was 119 mm greater than the control group (95% CI 54 to 184). Tai Chi also significantly improved WOMAC function, by 325 mm (95% CI 135 to 514), but not WOMAC stiffness. Other significantly better outcomes at 12 weeks were the global assessments, chair stand time, and most psychological measures. The benefits in WOMAC pain and function persisted to 24 weeks, and the benefits in psychological measures persisted to 48 weeks. Conclusion: For people with knee OA, Tai Chi reduces pain and improves physical and psychological function.
Summary of: Wang C, Schmid CH, Hibberd PL, Kalish P, Roubenoff R, Rones R, et al (2009) Tai Chi is effective in treating knee osteoarthritis: a randomized controlled trial. Arthritis Care & Research 61: 1545-1553 [Prepared by Kare Birger Hagen and Margreth Grotle, CAP Editors.] Question: What is the effect of Tai Chi for people with osteoarthritis (OA) of the knee? Design: Randomised, controlled trial with concealed allocation, blinded outcome assessment and intention-to-treat analysis. Setting: An urban tertiary academic hospital in the USA. Participants: Men and women ≥ 55 years, with body mass index @? 40 kg/m2, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain subscale score > 40 mm, knee OA as defined by the American College of Rheumatology, and grade 2, 3, or 4 radiographic severity on the Kellgren-Lawrence classification. Prior Tai Chi training, recent intra-articular steroid or hyaluronate injections, and reconstructive surgery on the knee were exclusion criteria. Randomisation of 40 participants allotted 20 to the Tai Chi group and 20 to an attention control group. Interventions: Both groups participated in 60-minute sessions twice weekly for 12 weeks. The Tai Chi sessions included self-massage, movement, breathing technique, and relaxation. The participants were instructed to practise Tai Chi at least 20 minutes per day at home in the intervention period, and to continue this practice after the intervention period. The control group sessions included 40 minutes of didactic lessons with nutrition and medical information and 20 minutes of stretching exercises. Participants were instructed to practise at least 20 minutes of stretching exercises per day at home. Outcome measures: The primary outcome was change in the WOMAC pain subscale (range 0-500) at 12 weeks follow up. Secondary outcomes were WOMAC function subscale (0-1700), WOMAC stiffness subscale (0-200) assessed at 12, 24, and 48 weeks followup, and weekly WOMAC pain scores during the 12-week intervention period and at 24, and 48 weeks follow-up. Additional measures included patient and physician global assessment, physical performance tests, and psychological measures of health-related quality of life, depression, and self-efficacy. Results: All 40 participants completed the study. At 12 weeks, the mean reduction in WOMAC pain rating in the Tai Chi group was 119 mm greater than the control group (95% CI 54 to 184). Tai Chi also significantly improved WOMAC function, by 325 mm (95% CI 135 to 514), but not WOMAC stiffness. Other significantly better outcomes at 12 weeks were the global assessments, chair stand time, and most psychological measures. The benefits in WOMAC pain and function persisted to 24 weeks, and the benefits in psychological measures persisted to 48 weeks. Conclusion: For people with knee OA, Tai Chi reduces pain and improves physical and psychological function.
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