0 the act of bending an arm, leg, etc. or of tightening a muscle -- 活动（手臂、腿等）；绷紧（肌肉）
After physiotherapy, the shoulder flexion significantly increased. 物理治疗以后，肩膀的活动能力显著提高。
hip flexion 髋关节屈曲
The stepper motor controls flow of air at pre-determined position in the swing to create sufficient air resistance to restrict excessive flexion of the knee.
By rapidly accelerating the hip forward (flexion velocity and flexion moment), there is a positive power.
A transoesophageal four chamber view,19 obtained with mild anterior flexion of the probe, was usually used.
Since the polycentric knee effectively moves the center of rotation posterior, an increased flexion moment (the extension stop) is expected.
Initial forward flexion, corresponding to a "heel-up" position if the shin comprises a foot, does not allow the biped to generate an adequate swing.
An extensor muscle is used in the proportional position control of the digit flexion; the greater the tension the wider the hand opens.
The idea behind this approach is making the fingers and thumb to behave as springs with a neutral position in full flexion.
A flexion cast is less acceptable in that it leaves the wrist with a permanent degree of limited extension.
