Austin Matthew S, Ghanem Elie, Joshi Ashish, Trappler Rachel, Parvizi Javad, Hozack William J
Rothman Institute of Orthopedics, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.
J Arthroplasty. 2008 Jun;23(4):515-21. doi: 10.1016/j.arth.2007.12.011. Epub 2008 Apr 15.
The commonly used standard goniometer has been shown to underestimate knee flexion. Computer-assisted navigation for total knee arthroplasty offers itself as an alternative method to quantify knee flexion. The goal of our study was to determine the reliability of each instrument in measuring intraoperative range of motion during total knee arthroplasty. We prospectively performed intraoperative measurements using both methods on 99 knees. We assessed the variability between the 2 devices and the confounding effect of body mass index. The mean difference between the goniometric and navigation measurements was significant for flexion, extension, and range of motion. Increasing body mass index accentuated this difference. The goniometric method underestimated flexion measurements as compared to navigation, especially in patients with high body mass index. Our study confirms that navigation is a reliable tool for performing in vivo assessment of range of motion.
常用的标准测角仪已被证明会低估膝关节屈曲度。全膝关节置换术的计算机辅助导航为量化膝关节屈曲度提供了一种替代方法。我们研究的目的是确定每种仪器在全膝关节置换术中测量术中活动范围的可靠性。我们前瞻性地对99个膝关节使用这两种方法进行术中测量。我们评估了两种设备之间的变异性以及体重指数的混杂效应。测角法和导航测量法在屈曲、伸展和活动范围方面的平均差异具有统计学意义。体重指数增加会加剧这种差异。与导航相比，测角法低估了屈曲测量值，尤其是在高体重指数患者中。我们的研究证实，导航是一种用于体内评估活动范围的可靠工具。
