An enthesophyte is a sharp bony projection at the site of a tendon or ligament.

Achilles insertional calcific tendinosis
The finding suggests 'overuse' where the tendon or ligament has often been under repeated stresses, eg from jumping sports. This particular example is on a heel bone, but it gives you the idea.

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Osteophytes, Enthesophytes, and High Bone Mass: A Bone-Forming Triad With Potential Relevance in Osteoarthritis. Hardcastle SA et al. Arthritis Rheumatol. 2014 Sep; 66(9): 2429–2439.

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