Objective To explore an anatomical basis for the medial plantar skin flaps and its clinical value of repairing heel defects. Methods The origin,branches,course and distribution of the medial plantar artery and the nerve of flaps were studied in 10 adult cadavers(20 legs).8 cases of homonymy and opposite side heel soft tissue defects with medial plantar skin flaps,aged 10-42 years.Free skin transplantation on the donors. Results The length of media plantar artery deep branch was (8.9±0.2)cm,gives off 3-5 cutaneous branches.Medial plantar nerve have 5-8 branches.it inchdes 3～5cutaneous branches distribute plantar skin and 2-4 plantar digital nerves distribute toes skin.The area of flaps was 4.0 cm×3.0 cm-6.0 cm×5.0 cm in the 8 flaps. 6 pedicle skin flaps were transfenrred to repair homonymy side heel soft tissue defects.2 opposite side heel soft tissue defects were repaired by 2 free flaps.All the flaps were survived. All patients were followed up one months to one year,the function and appearance of the flaps were good.Conclusion The flaps have less anatomic variation or sacrificing major vessels but have reliable blood supply and can restore good sensation after operation.They are ideal flaps for repairing heel soft tissue defects.

【Objective】 To investigate the efficacy and safety of double-sheath vacuum suction microchannel percutaneous nephrolithotomy (MPCNL) in the treatment of complex renal stones. 【Methods】 The clinical data of 139 patients with complicated renal stones who received MPCNL during Aug. 2019 and Jul.2020 were retrospectively analyzed. According to the operation modes, the patients were divided into the double-sheath vacuum suction group (dsVS group, n=72) and conventional nephrostomy sheath group (cNS group, n=67). The perioperative indexes and the first-stage stone clearance rate of the two groups were compared. 【Results】 In the dsVS group and cNS group, the mean operation time was (46.72±9.55) min and (57.22±11.31) min, respectively (P<0.05). The first-stage stone clearance rate was 83.33% and 70.15%, respectively (P<0.05). The BUN value was (5.07±1.65) mmol/L and (5.75±1.83) mmol/L, respectively (P<0.05). The WBC value was (9.45±2.46)×10⁹/L and (10.71±3.14)×10⁹/L, respectively (P<0.05). The incidence of postoperative fever was 1.39% and 11.94%, respectively (P<0.05). There was no significant difference in other clinical data between the two groups (P>0.05). 【Conclusion】 The double-sheath vacuum suction MPCNL is safe and effective to manage complex renal stones, which can shorten the operation time, reduce postoperative complications, and improve the stone clearance rate.