The shoulder is a ball and socket joint that allows a wide range of movement. Injury or degradation of the joint structures, from the muscles and soft tissues to the bones, can result in shoulder pain.

A shoulder fracture can result from a fall on the shoulder, a motor vehicle accident, contact sports, etc. The type of shoulder fracture varies by age. Most fractures in children occur in the clavicle bone (collarbone). In adults, the most common fracture is of the top part of the humerus (upper arm bone).

Osteoarthritis is the most common type of shoulder arthritis. This is also known as degenerative joint disease. Less common types of shoulder arthritis are rheumatoid arthritis (inflammatory) and traumatic arthritis.

Scar formation is a normal response following any injury or surgery; it is the way the body heals injured structures. Scar tissue may involve only the superficial skin, or it may involve the deeper tissues beneath the skin, including nerves and tendons.

A ligament is a thick band of tissue that connects two bones. There are many ligaments in the wrist. When a ligament is injured, this is referred to as a sprain. A very common ligament injured in a sprained wrist is the scapholunate ligament.

The scaphoid is one of eight small bones that make up the “carpal bones” of the wrist. It connects two rows of these bones - the proximal row (closer to the forearm) and the distal row (closer to the hand).

The rotator cuff is the group of four muscles and tendons that surround the shoulder joint, providing strength and stability. Above the rotator cuff there is a bursa, or sac of tissue, that covers and protects the rotator cuff as it comes into close contact with bones around the shoulder. When the rotator cuff is injured or damaged, it can lead to inflammation of the bursa, called bursitis, which causes pain and loss of motion.

There are several types of arthritis. Some kinds of arthritis are caused by trauma or over-use. Rheumatoid arthritis is different. Rheumatoid arthritis is caused by inflammation in the joint. This inflammation breaks down cartilage, which is the smooth lining of joints.

Arthritis describes any condition where cartilage in the joint breaks down. Normally, a joint consists of two smooth, cartilage-covered bone surfaces that fit together as a matched set and glide against one other.

Pseudogout is a type of inflammatory arthritis that causes joint inflammation due to the body depositing calcium pyrophosphate crystals in the joint and soft tissues. Pseudogout is also called calcium pyrophosphate deposition disease (CPPD).