Department of Orthopedic Surgery, Hallym University Dongtan Sacred Heart Hospital, Hwaseong-si, Republic of Korea.
Department of Radiology, Hallym University Dongtan Sacred Heart Hospital, Hwaseong-si, Republic of Korea.
J Ultrasound Med. 2024 Oct;43(10):1937-1946. doi: 10.1002/jum.16528. Epub 2024 Jul 17.
This study aimed to evaluate normal supraspinatus (SS) muscle elasticity using shear wave elastography (SWE) in an asymptomatic group, analyze its correlation with demographic factors and ultrasound (US) grayscale grade, and compare the elasticity between normal SS muscles and symptomatic SS muscles with tendon tears.
A prospective study was conducted with 101 adult patients with normal SS muscle scheduled for surgery due to a contralateral shoulder with SS tendon tear. Both shoulders underwent US examinations, including SWE. The SWE values, including mean and median elasticity, as well as the elasticity ratio, were analyzed for their correlation with demographic characteristics and grayscale grades. A comparison of SWE values was performed between the normal and symptomatic SS muscle groups.
The mean SWE modulus of the normal SS muscle was 27.87 kPa (±49.04), with an elasticity ratio of approximately 1.52 (±0.03). Males exhibited slightly higher elasticity ratios compared with females (1.61 vs 1.45, P = .016). The interobserver agreement for all SWE measurements was excellent (>0.8). Grayscale grade increased with age, showing a similar pattern in females (P < .001). However, no significant correlation was observed between SWE values and grayscale grade in the normal SS muscle group. SWE values in normal SS muscles were significantly lower than those with tendon tears (P < .001).
SWE provides objective measurements of normal SS muscle elasticity. Gender-based variations were observed, with males exhibiting slightly higher elastography ratios. SWE values were significantly lower in asymptomatic SS muscles compared with those with tendon tears.
本研究旨在使用剪切波弹性成像（SWE）评估无症状人群中正常冈上肌（SS）的肌肉弹性，分析其与人口统计学因素和超声（US）灰度等级的相关性，并比较正常 SS 肌肉与伴有肌腱撕裂的症状性 SS 肌肉的弹性。
前瞻性研究纳入了 101 例因对侧肩 SS 肌腱撕裂而计划接受手术的成人正常 SS 肌肉患者。所有患者双侧肩部均接受 US 检查，包括 SWE。分析 SWE 值（包括平均和中位数弹性以及弹性比）与人口统计学特征和灰度等级的相关性。比较正常和症状性 SS 肌肉组的 SWE 值。
正常 SS 肌肉的平均 SWE 模量为 27.87kPa（±49.04），弹性比约为 1.52（±0.03）。男性的弹性比略高于女性（1.61 比 1.45，P = .016）。所有 SWE 测量的观察者间一致性均极好（>0.8）。灰度等级随年龄增加而升高，女性呈相似模式（P < .001）。然而，正常 SS 肌肉组中 SWE 值与灰度等级之间无显著相关性。正常 SS 肌肉的 SWE 值明显低于伴有肌腱撕裂的肌肉（P < .001）。
SWE 提供了正常 SS 肌肉弹性的客观测量。观察到基于性别的变化，男性的弹性成像比值略高。与伴有肌腱撕裂的肌肉相比，无症状 SS 肌肉的 SWE 值明显更低。
