Erika O Huber1, Andre Meichtry2, Rob A de Bie3, Caroline H Bastiaenen4. 1. Institute of Physiotherapy, School of Health Professions, Zurich University of Applied Sciences, Winterthur, Switzerland; Research Group Function and Rehabilitation CAPHRI, Department of Epidemiology, Maastricht University, Maastricht, The Netherlands. Electronic address: huom@zhaw.ch. 2. Institute of Physiotherapy, School of Health Professions, Zurich University of Applied Sciences, Winterthur, Switzerland. Electronic address: andre.meichtry@zhaw.ch. 3. Research Group Function and Rehabilitation CAPHRI, Department of Epidemiology, Maastricht University, Maastricht, The Netherlands. Electronic address: ra.debie@maastrichtuniversity.nl. 4. Research Group Function and Rehabilitation CAPHRI, Department of Epidemiology, Maastricht University, Maastricht, The Netherlands. Electronic address: chg.bastiaenen@maastrichtuniversity.nl.
Abstract
INTRODUCTION: The Chair Stand Test (CST) is a frequently used performance-based test in clinical studies involving individuals with knee osteoarthritis and demonstrates good reliability. AIM: To assess the construct validity of change scores of the CST compared to three other measures in patients before and after total knee replacement surgery. METHODS: The construct validity of change scores of the CST compared to the Timed Up and Go (TUG) test, the Knee Injury and Osteoarthritis Outcome Score questionnaire (KOOS, subscale ADL) and the isometric muscle strength test of the knee extensors (IMS sum) was measured 1-2 week before and 3 months after surgery. RESULTS: Change (%) CST = -4.45, TUG = -2.08, KOOS ADL = 43.90, IMS sum = -13.24. Correlations CST-TUG = 0.56 (95% confidence interval (CI) 0.29, 0.74), CST-KOOS = -0.31 (95% CI -0.57, 0.01), CST-IMS sum = -0.11 (95% CI -0.42, 0.22). Comparison of pairwise correlations: CST-KOOS versus CST-TUG (p < 0.0004), CST-TUG versus CST-IMS sum (p < 0.0068), CST-KOOS versus CST-IMS sum (p < 0.3100). CONCLUSION: For patients undergoing TKR, the CST might not be an ideal measure to assess change between pre-surgery and 3 months post-surgery. Construct validity of change scores was close to zero but the result might have been influenced by the relatively small homogeneous sample size and the chosen timespan of measurement. We ordered pairwise correlations based on the strength of correlation between the different instruments, which to our knowledge has never been done before.
INTRODUCTION: The Chair Stand Test (CST) is a frequently used performance-based test in clinical studies involving individuals with knee osteoarthritis and demonstrates good reliability. AIM: To assess the construct validity of change scores of the CST compared to three other measures in patients before and after total knee replacement surgery. METHODS: The construct validity of change scores of the CST compared to the Timed Up and Go (TUG) test, the Knee Injury and Osteoarthritis Outcome Score questionnaire (KOOS, subscale ADL) and the isometric muscle strength test of the knee extensors (IMS sum) was measured 1-2 week before and 3 months after surgery. RESULTS: Change (%) CST = -4.45, TUG = -2.08, KOOS ADL = 43.90, IMS sum = -13.24. Correlations CST-TUG = 0.56 (95% confidence interval (CI) 0.29, 0.74), CST-KOOS = -0.31 (95% CI -0.57, 0.01), CST-IMS sum = -0.11 (95% CI -0.42, 0.22). Comparison of pairwise correlations: CST-KOOS versus CST-TUG (p < 0.0004), CST-TUG versus CST-IMS sum (p < 0.0068), CST-KOOS versus CST-IMS sum (p < 0.3100). CONCLUSION: For patients undergoing TKR, the CST might not be an ideal measure to assess change between pre-surgery and 3 months post-surgery. Construct validity of change scores was close to zero but the result might have been influenced by the relatively small homogeneous sample size and the chosen timespan of measurement. We ordered pairwise correlations based on the strength of correlation between the different instruments, which to our knowledge has never been done before.
Authors: Daniel K White; Zhichang Li; Yuqing Zhang; Adam R Marmon; Hiral Master; Joseph Zeni; Jingbo Niu; Long Jiang; Shu Zhang; Jianhao Lin Journal: Arch Phys Med Rehabil Date: 2017-07-29 Impact factor: 3.966