Spondyloarthritis (SpA) including psoriatic arthritis (PsA)
The enthesis organ concept has been of growing interest with advances in imaging and evolving understanding of its relevance in spondyloarthropathies, including psoriatic arthritis. Traditionally, anatomy of the enthesis, such as the Achilles tendon where intermittent contact between tendon and bone leads to the formation of fibrocartilages on the deep surface of the tendon, have been viewed as important to the pathology of enthesitis. However, many entheses have bursae and fat near the insertion site, and collectively, these structures and may contribute to microdamage or inflammation. This session reviews the concept of a 'functional enthesis' to emphasize anatomical, biomechanical and pathological features that are shared between true fibrocartilaginous entheses and regions proximal to the attachment sites.