WHY DO YOU NEED SHOULDER REPLACEMENT SURGERY? Your shoulder is the most mobile joint of your body. It helps you to move your hand in all the various motions in which you can move it. But, at the same time, it is extremely prone to injury and degeneration. While, depending upon the type of shoulder issue, the treatment varies, there is one treatment which has surpassed the efficiency of any other if the damage is too high - Shoulder Replacement Surgery.