例如深度屈膝，会增加膝关节的活动范围，更容易导致膝盖的急性或慢性不稳定。
Deep knee bends, for example, may increase the range of motion (ROM) of the knee joint to the point where the knee becomes more susceptible to chronic or acute instability.
由于关节部位存在疤痕，肌肉和关节周围的其他软组织就会变短，从而永久降低关节的活动范围。
Because of scar tissue at the joints, muscles and other soft tissues shorten around the joint which in time can permanently lose some of its movement.
如果关节存在严重的肿胀，就会无法活动——肢体在每个方向上的活动范围都十分有限。
If there is significant swelling within a joint, you will lose range of motion — the limb will only go so far in each direction.
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