What is the definition or description of: tendon surgery?

See below: Tendon repair refers to the surgical repair of damaged or torn tendons, which are cord-like structures made of strong fibrous connective tissue that connect muscles to bones. The shoulder, elbow, knee, and ankle joints are the most commonly affected by tendon injuries.

Tendon: Tendons attach muscles to bone. So, depends if partial tear or calcification or tendinosis( previous tendinitis that has healed in irregular pattern with continued pain past point healing) really question for surgeon to explain what is reason for surgery.