New Advances in the Knowledge of Elemental Enthesis Lesions: Doppler, Erosion, and Thickness.

The entheses are more than a point of anatomical attachment for tendons, ligaments, joint capsules and fascia to bones; its involvement in the pathophysiology of spondyloarthritis (SpA) and psoriatic arthritis (PsA) is the cornerstone of these diseases. In 1971, the relevance of the enthesis as the primary pathological site of seronegative SpA was clearly defined. 1 .