Berghmans Danielle D P, Lenssen Antoine F, van Rhijn Lodewijk W, de Bie Rob A
Department of Physical Therapy, Maastricht University Medical Center, Maastricht, the Netherlands.
J Orthop Sports Phys Ther. 2015 Jul;45(7):550-6. doi: 10.2519/jospt.2015.5825. Epub 2015 May 21.
A prospective cohort study, with assessments before, at 3 months after, and at 12 months after total knee arthroplasty (TKA).
To determine and compare the responsiveness and reliability of the Patient-Specific Functional Scale (PSFS) in patients undergoing a TKA.
Reliable and valid measurement instruments are important to measure functional status. The PSFS is frequently used in several patient populations, but its methodological characteristics in a population of patients with TKA in the perioperative phases of surgery are unknown.
The PSFS, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and global perceived effect (GPE) were administered at 3 time points in 150 patients undergoing a TKA. Correlations, effect sizes, and standardized response means were calculated. The PSFS was administered twice to assess its reliability in terms of intraclass correlation coefficients and limits of agreement.
The correlation coefficients between the PSFS and WOMAC at 3 months and 1 year were 0.41 and 0.48, respectively; those between the PSFS and GPE were -0.37 and -0.55, respectively. The effect sizes of the PSFS at 3 months and 1 year were 1.71 and 2.89, respectively; those of the WOMAC were 1.45 and 1.64, respectively. The standardized response means of the PSFS at 3 months and 1 year were 0.96 and 1.48, respectively; those of the WOMAC were 1.28 and 1.37, respectively. The intraclass correlation coefficients ranged between 0.73 and 0.86. The systematic error was between 0.12 and 0.54. The limits of agreement ranged from ±2.17 to ±2.72.
The reliability of the PSFS is good. Its responsiveness is high, especially in the long term. However, the PSFS cannot be used interchangeably with the WOMAC in the immediate postoperative period.
一项前瞻性队列研究，在全膝关节置换术（TKA）前、术后3个月和术后12个月进行评估。
确定并比较全膝关节置换术患者专用功能量表（PSFS）的反应性和可靠性。
可靠且有效的测量工具对于测量功能状态很重要。PSFS在多个患者群体中经常使用，但其在TKA患者围手术期的方法学特征尚不清楚。
对150例行TKA的患者在3个时间点进行PSFS、西安大略和麦克马斯特大学骨关节炎指数（WOMAC）以及总体感知效果（GPE）评估。计算相关性、效应量和标准化反应均值。对PSFS进行两次评估，以根据组内相关系数和一致性界限评估其可靠性。
PSFS与WOMAC在3个月和1年时的相关系数分别为0.41和0.48；PSFS与GPE的相关系数分别为-0.37和-0.55。PSFS在3个月和1年时的效应量分别为1.71和2.89；WOMAC的效应量分别为1.45和1.64。PSFS在3个月和1年时的标准化反应均值分别为0.96和1.48；WOMAC的标准化反应均值分别为1.28和1.37。组内相关系数在0.73至0.86之间。系统误差在0.12至0.54之间。一致性界限在±2.17至±2.72之间。
PSFS的可靠性良好。其反应性较高，尤其是在长期。然而，在术后即刻，PSFS不能与WOMAC互换使用。
