Wang Jing, Xu Rui, Kang Xuewen, Zhang Haihong
Department of Orthopedics, Orthopedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou Gansu, 730030, P. R. China.
Department of Radiology, Lanzhou University Second Hospital, Lanzhou Gansu, 730030, P. R. China.
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi. 2016 Sep 8;30(9):1061-1064. doi: 10.7507/1002-1892.20160216.
To evaluate the accuracy of using smartphone to measure the angle of acetabular component in total hip arthroplasty (THA).
Between June 2012 and September 2015, the acetabular abduction and anteversion angles were measured in 50 patients undergoing THA. There were 24 males and 26 females, aged 37 to 83 years (mean, 71 years). The left hip was involved in 22 cases and the right hip in 28 cases. Of 50 patients, 34 suffered from fracture of the femoral neck, and 16 suffered from avascular necrosis of the femoral head. Acetabular dysplasia was excluded in all cases. A smartphone was used to measure the acetabular abduction and anteversion angles during operation; standard Picture Archiving and Communication Systems (PACS) was used to measured the acetabular abduction and anteversion angles on the X-ray film at 1 week after operation. It was defined as positive that the component angle values by PACS measurement were greater than those by the smartphone measurement, whereas as negative. The two measurement methods were compared, and intra-observer variability was assessed by analyzing the intraclass correlation coefficient (ICC), the Mann-Whitney U-test was used to analyze difference.
The ICC was 0.84 in the acetabular component angles by smartphone and PACS measurement methods. The acetabular component abduction angle was (44.02±1.33)° and the anteversion angle was (17.62±2.20)° by smartphone measurement. The acetabular component abduction angle was (44.74±4.05)° and the anteversion angle was (17.22±5.57)° by PACS measurement. There was no significant difference between two measurement methods (=-1.977, =0.482; =-0.368, =0.713). The acetabular component angle was in the safe zone in 44 cases; and the acetabular component anteversion angle was beyond safe range of 1 to 5°, and the abduction angle was beyond safe range of 1 to 3° in 6 cases. Intra-measurement variability was -21 to +10° for the anteversion angle and -10 to + 9° for the abduction angle, indicating that the acetabular component anteversion angle by smartphone measurement was greater than that by the PACS measurement, and the abduction angle was less than that by PACS measurement.
Smartphone is a convenient tool to measure the acetabular component angle in THA.
评估在全髋关节置换术（THA）中使用智能手机测量髋臼组件角度的准确性。
2012年6月至2015年9月期间，对50例行THA的患者测量髋臼外展角和前倾角。其中男性24例，女性26例，年龄37至83岁（平均71岁）。左侧髋关节受累22例，右侧髋关节受累28例。50例患者中，34例为股骨颈骨折，16例为股骨头缺血性坏死。所有病例均排除髋臼发育不良。术中使用智能手机测量髋臼外展角和前倾角；术后1周使用标准图像存档与通信系统（PACS）在X线片上测量髋臼外展角和前倾角。PACS测量的组件角度值大于智能手机测量的组件角度值定义为阳性，反之则为阴性。比较两种测量方法，并通过分析组内相关系数（ICC）评估观察者内变异性，使用曼-惠特尼U检验分析差异。
智能手机和PACS测量方法测量髋臼组件角度的ICC为0.84。智能手机测量的髋臼组件外展角为（44.02±1.33）°，前倾角为（17.62±2.20）°。PACS测量的髋臼组件外展角为（44.74±4.05）°，前倾角为（17.22±5.57）°。两种测量方法之间无显著差异（=-1.977，=0.482；=-0.368，=0.713）。44例髋臼组件角度在安全区内；6例髋臼组件前倾角超出安全范围1至5°，外展角超出安全范围1至3°。前倾角的测量内变异性为-21至+10°，外展角的测量内变异性为-10至+9°，表明智能手机测量的髋臼组件前倾角大于PACS测量的前倾角，外展角小于PACS测量的外展角。
智能手机是THA中测量髋臼组件角度的便捷工具。
