The testing results about the use of new rail joint was introduced, which include the dynamic flexure stress of upper limb and lower margin of joint bar, shearing stress of horizontally neutral axis.

In the measurement of human upper limb, the position for the center of shoulder joint can be supposed by comparative position to acromion.

When there is a bleeding in the upper limb of a wounded person but he suffers no bone fracture or joint damage, the bleeding can be stopped by pressurized dressing.