Objective To investigate the clinical value of high-frequency ultrasound in the diagnosis of pronator teres syndrome (PTS). Methods The high-frequency ultrasound was employed to examine and measure the median nerve of the pronator teres muscle in 30 patients with PTS and 30 healthy volunteers (control group).The long-axis diameter (LA),short-axis diameter (SA) and cross-sectional area (CSA) of the median nerve were measured.The receiver operating characteristic curve of the median nerve ultrasonic measurement results was established,and the area under the curve (AUC) was calculated.The diagnostic efficiency of each index for PTS was compared with the surgical results as a reference. Results The PTS group showed larger LA[(5.02±0.50) mm vs.(3.89±0.41) mm;t=4.38,P=0.013],SA[(2.55±0.46) mm vs.(1.70±0.41) mm;t=5.19,P=0.009],and CSA[(11.13±3.72) mm2 vs.(6.88±2.68) mm2;t=8.42,P=0.008] of the median nerve than the control group.The AUC of CSA,SA,and LA was 94.3% (95%CI=0.912-0.972,Z=3.586,P=0.001),77.7% (95%CI=0.734-0.815,Z=2.855, P=0.006),and 78.8% (95%CI=0.752-0.821,Z=3.091,P=0.004),respectively.With 8.63 mm2 as the cutoff value,the sensitivity and specificity of CSA in diagnosing PTS were 93.3% and 90.0%,respectively. Conclusion High-frequency ultrasound is a practical method for diagnosing PTS,and the CSA of median nerve has a high diagnostic value.
目的 探讨高频超声诊断旋前圆肌综合征(PTS)的临床应用价值。方法 采用高频超声对30例PTS患者及30名健康对照者旋前圆肌水平正中神经进行观察,测量正中神经长径(LA)、短径(SA)和横截面积(CSA)。以手术结果作为参照,绘制正中神经超声测量结果受试者工作特性曲线,并计算曲线下面积(AUC),比较各测量指标对PTS诊断的性能。结果 与对照组比较,PTS组正中神经LA[(5.02±0.50)mm比(3.89±0.41)mm;t=4.38,P=0.013]、SA[(2.55±0.46)mm比(1.70±0.41)mm;t=5.19,P=0.009]和CSA[(11.13±3.72)mm2比(6.88±2.68)mm2;t=8.42,P=0.008]明显增大。CSA、SA和LA诊断PTS的AUC分别为94.3%(95%CI=0.912~0.972,Z=3.586,P=0.001)、77.7%(95%CI=0.734~0.815,Z=2.855,P=0.006)、78.8%(95%CI=0.752~0.821,Z=3.091,P=0.004),以8.63 mm2为截断值,CSA诊断PTS敏感度为93.3%,特异度为90.0%。结论 高频超声是诊断PTS的有效方法,其中正中神经CSA具有较高的诊断价值。.
Keywords: high-frequency ultrasound; median nerve compression; pronator teres syndrome.