目的　为膝降血管髌下支蒂股骨内侧髁骨膜瓣修复膝关节面缺损提供解剖学基础。 方法　在30侧动脉内灌注红色乳胶的成人下肢标本上，以收肌结节、股骨内侧髁为观测点解剖观测膝降动脉关节支的走行、分支与分布。另在1侧新鲜标本上进行摹拟手术。  结果　膝降血管关节支在距股骨内侧髁下缘上(5.9±1.2) cm处发出两大分支：①骨膜支起始外径（1.3±0.2）mm，在股骨内侧髁面上走行距离为(4.8±1.1) cm；②髌下支起始外径为(1.3±0.2) mm，向下走行距离为(6.6±1.5)cm。  结论　可形成膝降血管髌下支—骨膜支蒂股骨内侧髁骨膜瓣逆行转位修复膝关节面缺损。

Objective　To provide anatomical basis of medial femoral condyle periosteal flap pedicled with the infrapatellar branch of the descending genicular artery for reconstruction of the knee joint.　Methods  30 embalmed lower limbs of adult cadavers perfused with the red latex were used for this anatomical study. The adductor tubercle and medial femoral codyle were observational landmarks, the followings were observed: the course, branch and distribution of the branch of the desceding genicular artery to the knee joint.　Results　The articular branch of descending genicular artery above the inferior edge of medial femoral condyle (5.9±1.2)cm always gives off two mian branches: the periosteal branch and the infrapatellar branch. The original diameter of the periosteal branch is（1.3±0.2）mm, and it travels along the medial femoral condyle (4.8±1.1)cm in length; the original diameter of the infrapatellar branch is(1.3±0.2)mm, and its length is (6.6±1.5)cm.　Conclusion　The medial femoral condyle periosteal flap pedicled with the infrapatellar branch of the descending genicular artery can be developed to repair bone injuries of knee joint.