Methods: In 45 cases (50 lower limbs) with differernt clinical stages of venous incompetence of lower extremities, the number, diameter and blood flow velocity of PVs were examined by color Doppler ultrasound.

• 方法：用彩色多普勒超声检查下肢静脉功能不全患者45例50条下肢的小腿交通静脉的数目、部位、内径及血流速度，并分别与患者的临床表现分级进行相关性分析。