Shoulder joint arthritis is a disorder characterised by pain and stiffness. It can be caused by injury, overuse or unrepaired rotator cuff tears. The cartilage in the joint is worn out and extra bone spurs start to form. Treatment involves medication, physiotherapy, injections into the joint and joint replacement. Joint replacement involves removing the worn out joint surfaces and replacing them with metal and plastic components. After a joint replacement, patient will experience greater range of motion and less pain, improving the overall function of the shoulder.