TA chronic Achilles tendon injury, most commonly caused by repetitive strain, microtraumas, or degenerative changes, characterized by pain in the heel and the back of the ankle, morning stiffness, tenderness when pressing on the tendon, or pain after physical exertion. Risk factors include a sudden increase in physical activity, improper footwear, foot biomechanical disorders, and advanced age. Prolonged inflammation can lead to structural changes in the tendon and increase the risk of rupture.