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Achilles tendon ossification

Achilles tendon ossification (ATO) is an uncommon condition and has characteristic bone formation within the Achilles tendon itself. 

Epidemiology

ATO is more common in males 4

Pathology

The aetiology is unknown but Achilles tendon ossification is seen both with previous macrotrauma of the tendon (e.g Achilles tendon rupture, previous surgery) as well as repetitive microtrauma 1. There may be a familial or genetic genetic component 3

It is somewhat more common than dystrophic calcification of the Achilles tendon, and may represent a separate entity rather than progression. 

Radiographic features

It is characterised by mature bone (i.e. cortex, trabeculae, marrow).

Treatment and prognosis

Complications

An ossified Achilles tendon may fracture. 

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