What condition refers to inflammation of a tendon?

The correct answer is tendinitis, which specifically refers to the inflammation of a tendon. Tendons are the fibrous connective tissues that attach muscles to bones, and when they become inflamed—often due to overuse, injury, or repetitive motion—it results in a condition known as tendinitis. This condition usually manifests as pain, swelling, and restricted movement around the affected tendon, and it commonly occurs in various parts of the body, such as the shoulders, elbows, wrists, knees, and heels.

Muscle strains and sprains involve different tissues; strains affect muscles or muscle-tendon junctions, while sprains involve ligaments, which connect bones to each other. An ACL, or anterior cruciate ligament, specifically refers to a key ligament in the knee and is not an inflammatory condition but rather an anatomical structure that can be injured.