曲面的拐度

flexion of vertebral column flexion of knee joint flexion of upper limb surface of constant surface flexion zone radical flexion flexion spring internal flexion thematic flexion oriented boundary of surface evolute of a surface flexion surface moment of flexion plantar flexion of foot angle of greatest flexion force of flexion range of flexion flexion reflex of leg flexion of uterus flexion deformity of hallux full range of flexion lateral flexion of uterus