Employees of Hospitals, Schools, Universities and Libraries may download FREE medical animations from Nucleus by signing up for a free trial: nmal.nucleusmedicalmedia.com/free-trial-membership-a #ShoulderArthritis #arthritis #osteoarthritis MEDICAL ANIMATION TRANSCRIPT: Your main shoulder joint is made up of two bones, your upper arm bone, called the humerus, and your shoulder blade, or scapula. This joint called the glenohumeral joint is where the head of your humerus fits into the socket of your scapula. Smooth tissue called articular cartilage lines the bony surfaces of the joint. Tough tissue, called the joint capsule surrounds the joint. Fluid inside the capsule helps lubricate the joint. All of these features help your shoulder move freely. Shoulder arthritis is a painful disease in your shoulder joint. The two main types of shoulder arthritis are osteoarthritis, which may be due to years of overuse or injury, and rheumatoid arthritis. In osteoarthritis, the cartilage ...