Tendons connect muscle to bone and are primarily made up of collagen fibers, water, and connective tissue. They are an integral component of our musculoskeletal system, but can be a source of pain and dysfunction.
Tendon problems (or tendinopathy) may affect any joint, especially the shoulder, elbow, wrist, hip, knee, ankle, etc. As with a muscle, tendons have structural breaking points. When stress is applied to the tendon, it will elongate slightly.
If the stress continues beyond the tensile strength that the tendon can handle, it will rupture. This frequently requires surgical treatment and should be evaluated by a physician if suspected.