胫腓骨干上1/3骨折采用持续牵引夹板固定时,膝关节应置于屈曲位的角度是()
A:20°~40°
B:40°~80°
C:80°~100°
D:100°~120°
E:120°~140°
出自:中医骨伤科高级职称