The elbow is a hinge and pivot joint between the humerus (upper arm bone), radius (forearm bone on the same side as the thumb) and ulna (forearm bone on the same side as the pinky).  Articular cartilage lines the ends of these bones in the elbow joint and allows for smooth, easy movements of the elbow.  Loose bodies in the elbow are small fragments that break off from the cartilage and bone in the joint.  The loose bodies originate as a result of trauma, from an osteochondritis dissecans (OCD) lesion, or osteoarthritis that is breaking down the cartilage in the joint.  Athletes that place a lot of stress on their elbows are at a higher risk of developing loose bodies within the joint.  Loose bodies can cause pain, swelling and a ‘catching and locking’ sensation in the elbow.  Arthroscopic surgery is recommended to remove the loose bodies. This minimally invasive procedure will alleviate pain and reduce stiffness in the elbow.