Each leg is composed of two rotational joints and two segments.
每个回合是由两个扭转接头和两局部。
Traditionally, artificial knee-joints use hydraulic damping, which presents more angular resistance to fast rotational motion than to slow motion.
传统上，人工膝关节使用液压的阻尼，其特性是会对较快的旋转施予较大的阻力。
Since full rotation of the thighbones can no longer occur in the hip joints, much of the rotational torque is transferred to the knees and the lumbar spine—a recipe for knee and lower back injuries.
结果是大腿骨无法充分由髋关节旋转就会造成部分的受力转移到膝盖和下腰椎上—正是膝盖和下腰痛的邀请函。
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