condition

Achilles Tendonitis

The Achilles tendon is comprised of type I collagen fibers; these fibers are both very strong and very flexible. The tendon is covered in a thin layer of connective tissue known as paratenon, which is rich in elastin and penetrates into the tendon, keeping the collagen bundles together while allowing movement between them.[24] The difference between tendinosis and tendinitis is that in the former there are degenerative changes in the tendon's structure and the sheath, making it more vulnerable and prone to breaking. At the cellular level, there is no evidence of an acute or recent inflammatory process. In tendinitis, the opposite happens; there is an acute inflammatory process, resulting from acute trauma, excessive use, or lack of training.[25] Paratenonitis is an inflammation of the outer layers of the tendon and encompasses conditions such as tenosynovitis and tenovaginitis.[26] This pathology generates edema and exudate with inflammatory cells, followed by a fibrinous exudate that causes crepitus and limitation of the tendinous course within the sheath. It can become chronic by developing an immature connective tissue that expands an organized fibrin network known as adhesions.[27]

Ref:
Medina Pabón MA, Naqvi U. Achilles Tendonitis. [Updated 2022 May 29]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK538149/

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Added on Jan 10, 2023 by Barbara Van De Keer
Edited on Jun 24, 2023 by Barbara Van De Keer

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