Yang Yu-Jia, Zhang Ding-Yue, Ruan Xiao-Miao, Qiu Li
Department of Diagnostic Sonography, West China Hospital, Sichuan University, Chengdu 610041, China.
Sichuan Da Xue Xue Bao Yi Xue Ban. 2021 Jan;52(1):104-110. doi: 10.12182/20201160206.
To investigate A1 pulley thickness of flexor tendon in healthy volunteers and to analyze its influence factors.
The study included 90 healthy volunteers and the A1 pulley thickness at bilateral fingers was measured using high frequency ultrasound. The following parameters were recorded for each participant: age, gender, weight, height, body mass index (BMI).
High-frequency ultrasound can clearly show A1 pulley. There was no significant difference in A1 pulley thickness between the bilateral fingers ( >0.05). A1 pulley thickness was significantly different in different fingers ( <0.05). Further comparison showed that A1 pulley thickness could be divided into two subsets: thumb and little finger ((0.196±0.051) mm), index, middle and ring fingers ((0.230±0.055) mm). A1 pulley thickness was positively correlated with age ( =0.468, <0.001). The normal reference ranges for thumb and little finger were 0.09-0.23 mm, 0.12-0.30 mm and 0.12-0.32 mm, respectively. The normal reference ranges for index, middle and ring fingers were 0.11-0.27 mm, 0.15-0.35 mm and 0.17-0.35 mm in volunteers aged 3-19 yr., 20-49 yr., and ≥50 yr., respectively. Gender and BMI had negligible impact on A1 pulley thickness ( >0.05).
High-frequency ultrasound can clearly show and measure A1 pulley. Site and age should be taken into account when determining the reference range of normal A1 pulley thickness. High-frequency ultrasound can be a quantitative evaluation method for A1 pulley lesions.
研究健康志愿者屈肌腱A1滑车厚度并分析其影响因素。
本研究纳入90名健康志愿者，采用高频超声测量双侧手指的A1滑车厚度。记录每位参与者的以下参数：年龄、性别、体重、身高、体重指数（BMI）。
高频超声可清晰显示A1滑车。双侧手指间A1滑车厚度无显著差异（>0.05）。不同手指的A1滑车厚度有显著差异（<0.05）。进一步比较显示，A1滑车厚度可分为两个亚组：拇指和小指（（0.196±0.051）mm），示指、中指和环指（（0.230±0.055）mm）。A1滑车厚度与年龄呈正相关（=0.468，<0.001）。拇指和小指的正常参考范围分别为0.09 - 0.23 mm、0.12 - 0.30 mm和0.12 - 0.32 mm。3 - 19岁、20 - 49岁和≥50岁志愿者的示指、中指和环指正常参考范围分别为0.11 - 0.27 mm、0.15 - 0.35 mm和0.17 - 0.35 mm。性别和BMI对A1滑车厚度影响可忽略不计（>0.05）。
高频超声可清晰显示并测量A1滑车。确定正常A1滑车厚度参考范围时应考虑部位和年龄。高频超声可作为A1滑车病变的定量评估方法。
