Inflammation at the insertion sites of a tendon or ligament or joint capsule or fascia to the bone is called as Enthesitis. It manifests as tenderness and restriction of movements at these sites.
The most common sites for enthesitis are insertion sites of the Achilles tendon, plantar fascia, patellar tendon and quadriceps tendon. When enthesitis is associated with idiopathic arthritis, it is referred to as Enthesitis Related Arthritis or ERA.
It typically occurs in boys, usually over 6 years of age and has a familial predilection. Axial involvement, acute anterior uveitis and presence of HLAB27 antigen are other features associated with ERA patients.
ERA in children closely resembles ankylosing spondylitis seen in adults, which is a disease predominantly affecting the spine and sacroiliac joints.
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