What is lupus tendinitis (also spelled lupus tendonitis)?
Lupus tendinitis (lupus tendonitis) and tenosynovitis are common in systemic lupus erythematosus (SLE). The tendons are sinewy, inelastic fibrous tissue that connects the muscles to the bones. When muscles contract to move parts of the body, these strong tendons enable the muscles to move the much stronger bones. The movement of these tendons in unison with the body’s muscles and joints allows us to move. To demonstrate tendons to yourself, place your left fingers on the front bend of your right elbow. Then, bend your right elbow. The muscle just above this is your biceps. The hard, long structures just below the biceps that connect to the bone below the bend are the biceps tendons. If these were to become inflamed and painful, this would be “biceps tendonitis.”