目的  改进双蒂腓肠肌皮瓣下滑术式，细化其修复跟腱复合组织缺损适应证，减少供区创伤。方法  0侧成人下肢标本，模拟只切断比目鱼肌近端附着点、保留跟腱远端完整性的双蒂腓肠肌V-Y推进皮瓣，测定膝关节不同屈曲角度下皮瓣下滑的距离。结果  在膝关节屈曲0°、30°、60°、90°时，上述方法后双蒂腓肠肌皮瓣下滑的平均距离分别为（13.83±5.31）mm、（25.00±2.83）mm、（32.67±4.41）mm、（39.50±　4.85）mm。结论  双蒂腓肠肌V-Y下滑术式中只切断比目鱼肌近端附着点后重建，保留跟腱远端完整性的这一改进在解剖学上是可行的，适用于40mm以内的成人跟腱复合组织缺损。

Objective: To modify the sliding bi-pedicled gastrocnemius flap technique, quantify its indications for repairing the composite Achilles tendon defects, and lessen the donor site morbidity. Methods: Thirty adult specimens of the lower extremity were used. The simulations of the bi-pedicaled gastrocnemius flap were made on these specimens with the detachment of the proximal soleus and the preservation of the integrity of Achilles tendon. The sliding distances of this flap were measured under different degrees of knee flexion. Results: When the knees flexed 0 , 30 , 60  and 90 , the average sliding distances of the flap were 13.83mm, 25.00mm, 32.67mm and 39.50mm respectively. Conclusions: The mere detachment of the proximal soleus and preservation of the integrity of Achilles tendon during the sliding of bi-pedicled gastrocnemius flap is applicable anatomically and is suitable for repairing the composite Achilles tendon defects within 40mm.