Tendons attach muscles to bones, ligaments attach bones to one another, and where a tendon or ligament meets the bone is an enthesis. Enthesitis occurs when they become inflamed and painful because of injury, overuse or disease.
There are many different types of enthesopathies, the conditions leading to enthesitis. Some are systemic illnesses, some types just defined by the area they affect, such as plantar fasciitis, Achilles tendinitis, rotator cuff syndrome, bursitis of the hip, enthesopathy of the knee and so on.
Enthesitis isn’t always linked to osteoarthritis or adult rheumatoid arthritis (RA), but people with those conditions can have it. It’s more common in certain forms of autoimmune arthritis, including psoriatic arthritis and ankylosing spondylitis, and in some children with juvenile idiopathic arthritis.
The inflammation usually affects the heel,…
