If your foot is at a right Angle to your outstretched leg and does not dangle, you have a low ankle-joint axis and will be more comfortable in flat shoes than in high heels.
With a unique 2-piece joint between the axle and the wheel, the same extreme wheel turning angle is divided into two shallower angles without joint binding.
一个独特的2片联合之间的车轴和车轮，同样的极端车轮转角分为两个较浅的角度而不联合约束力。
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Result:Unaffected side of hemiplegic patient and normal lower limb were notable different in time parameters, space parameters and knee jointangle(P<0.01).