Objective To assess the reproducibility of shear wave elastography(SWE)in measuring the stiffness of the coracohumeral ligament in patients with frozen shoulder at different shoulder external rotation positions.Methods SWE was conducted by two examiners on 45 patients with stages Ⅱ and Ⅲ frozen shoulder to measure the mean elastic modulus of the coracohumeral ligament as the ligament's stiffness.A follow-up measurement was conducted one week later.The evaluations were carried out at four distinct external rotation positions:neutral shoulder position,and external rotations of 10°,20°,and 30°.Intra-and interexaminer reproducibility of the coracohumeral ligament's elasticity modulus at different shoulder external rotation positions was assessed by a two-way randomized model with an intraclass correlation coefficient(ICC).Bland-Altman plots were drawn to assess the consistency of the measurement results within and between observers.Results A statistically significant differences in coracohumeral ligament stiffness were found within and between examiners in the neutral position,10° and 20°of external rotation(all P<0.05),and the reproducibility of the measured values within and between examiners was poor(all ICC<0.40,all P<0.05).At 30° rotated of external rotation,the differences in coracohumeral ligament stiffness measured within and between the examiner were not statistically significant,and the intra-examiner and inter-examiner reproducibility were both good(both ICC>0.40,both P<0.001).Shapiro-Wilk test indicated that the differences in the measurements of the coracohumeral ligament stiffness with and between the examiner followed a normal distribution at 30° of external rotation.The Bland-Altman scatter showed that at 30° of external rotation,the consistency of the measured stiffness of the coracobrachial ligament was good with and between the examiner.Conclusion The SWE measures stiffness of the coracohumerale ligament in patients with stage Ⅱ and Ⅲ frozen shoulder at 30° of external rotation of the shoulder joint have good reproducibility and consistency.
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