Enthesitis
Inflammation where a tendon or ligament attaches to bone, a key feature of some types of inflammatory arthritis, where ultrasound is especially useful
Enthesitis is inflammation at the entheses, the points where tendons and ligaments attach to bone. It is a characteristic feature of a group of conditions including psoriatic arthritis and axial spondyloarthritis, though it can also occur on its own, often from overuse. Common sites include the heel, where the Achilles tendon attaches, and around the elbows, knees and pelvis.
Written for patients and reviewed by Dr Liubov Borukhson, Consultant Rheumatologist (GMC 7021928). Last clinically reviewed: June 2026.
Enthesitis and enthesopathy: what the terms mean
A few closely related words are easy to confuse:
- An enthesis is the point where a tendon or ligament attaches to bone.
- Enthesopathy is the general, umbrella term for any disorder of an enthesis. If a scan or imaging report mentions enthesopathy, or enthesopathic changes, it simply means changes at these attachment points, which may be due to inflammation, to wear and tear, or to long-term mechanical stress.
- Enthesitis is specifically inflammation of the enthesis, the inflammatory form of enthesopathy. This is the type linked to inflammatory arthritis, and the kind ultrasound is so useful for confirming.
Common symptoms
Enthesitis tends to cause fairly localised symptoms at the attachment points. Features may include:
- Pain and tenderness where a tendon or ligament meets bone, such as the back of the heel
- Pain that is often worse after rest and with the first movements
- Sometimes swelling at the affected point
- When part of an inflammatory arthritis, other joint or spinal symptoms too
How it is diagnosed
Enthesitis can be recognised from the pattern of symptoms and examination, and an important part of assessment is judging whether it is an isolated, overuse-related problem or part of an underlying inflammatory arthritis, as that changes the approach.
Ultrasound is particularly valuable for enthesitis. It shows the attachment points in detail and can confirm inflammation there, sometimes before it is obvious otherwise, which also helps decide whether an inflammatory arthritis is present. Dr Borukhson uses point-of-care ultrasound during the consultation, so the area can often be examined in the same visit. You can read more on the ultrasound clinic page.
How it is treated
For isolated enthesitis, treatment often involves activity modification, a structured exercise programme and pain relief. Where it is part of an inflammatory arthritis, treating the underlying condition is central. Where a particular site is troublesome, a carefully considered ultrasound-guided injection may sometimes help. The plan is agreed with you.
Enthesitis-related arthritis (ERA)
Enthesitis-related arthritis (ERA) is a recognised category of inflammatory arthritis in which enthesitis is a defining feature alongside joint inflammation. It is one of the forms of juvenile idiopathic arthritis, beginning in childhood or the teenage years, and it belongs to the wider spondyloarthritis family. It is often associated with the HLA-B27 gene and with a family history of related conditions.
People sometimes ask specifically about enthesitis-related arthritis in adults. In adulthood, those who had ERA as children, or who have the same pattern of enthesitis together with arthritis, are generally assessed and managed within the adult spondyloarthritis spectrum, overlapping with axial spondyloarthritis and psoriatic arthritis. The principles are the same: confirm the pattern, look for enthesitis on ultrasound, and treat the underlying inflammatory condition.
Why assessment matters
Because enthesitis can be a clue to an underlying inflammatory arthritis, assessing it properly matters both to settle the symptoms and to catch any wider condition early. If you have persistent pain where a tendon attaches to bone, such as ongoing heel pain, a specialist review, with ultrasound where helpful, can clarify it.
Common questions
How is enthesitis diagnosed?
Enthesitis can often be recognised from the pattern of symptoms and a careful examination of the tender attachment points. Ultrasound is particularly useful here, as it shows these points in detail and can confirm inflammation, sometimes before it is clear in other ways. Dr Borukhson uses point-of-care ultrasound during the consultation, so the area can usually be examined in the same visit.
My scan report mentions enthesopathy. What does that mean?
Enthesopathy is a general, umbrella term for any change at an enthesis, the point where a tendon or ligament attaches to bone. It does not, on its own, say whether the cause is inflammation, wear and tear, or long-term mechanical stress. Enthesitis is specifically the inflammatory form, and a specialist review, with ultrasound where helpful, can clarify which one a report is describing.
Is enthesitis serious, or will it settle on its own?
Isolated, overuse-related enthesitis often settles with activity changes, a structured exercise programme and pain relief. The reason a proper assessment matters is that enthesitis can sometimes be an early clue to an underlying inflammatory arthritis, which is worth catching early. Persistent pain where a tendon attaches to bone, such as ongoing heel pain, is worth having reviewed rather than simply waiting it out.
Will I need surgery or an injection for enthesitis?
Most enthesitis is managed without surgery. The starting point is usually activity modification, exercises and pain relief, and where it is part of an inflammatory arthritis, treating the underlying condition is central. If one particular site stays troublesome, a carefully considered ultrasound-guided injection may sometimes help, and any plan is agreed with you.
Persistent pain where a tendon attaches to bone?
A specialist assessment, with ultrasound where helpful, can confirm enthesitis and check whether an underlying inflammatory condition is present
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