Tendon disorders are medical conditions that result in the tendons not functioning normally. Tendinitis is a disorder of tendons without sheaths and tenosynovitis is a disorder of tendons with sheaths. Tendons are rope-like structures made of strong, smooth, shiny fibers. With repetitive or prolonged activities, forceful exertion, awkward and static postures, vibration, and localized mechanical stress, the tendons fibers can tear apart in much the same way a rope becomes frayed. These tendon changes trigger an inflammatory response.
Inflammation is a localized response of tissue to injury.
Over time, inflamed tendons become thickened, bumpy, and irregular. Without rest and time for the tissue to heal, tendons can become permanently weakened. Tenosynovitis is an inflammation of the tendon sheath. The inner walls of the sheath produce a slippery fluid, called synovial fluid, which lubricates the tendon. With repetitive or prolonged activities, forceful exertion, awkward and static posture, vibration, and localized mechanical stress, the lubrication system may malfunction.