Tendonitis is a common condition involving the inflammation of a tendon, a thick, fibrous cord connecting muscle to bone. While most people associate tendon issues with localized pain, the condition can sometimes produce a distinct sensation or noise during movement. These audible or palpable phenomena signal irritation within the structure that allows the tendon to move smoothly.
Understanding Tendon Crepitus
The specific sound or feeling associated with an irritated tendon is medically termed crepitus. This sensation can be both felt by the patient and, less frequently, heard by others. People often describe it as a grating, crunching, or creaking sound as the joint is moved.
The sensation is often more palpable than clearly audible, meaning a healthcare provider can feel the crunching texture beneath the skin when the affected tendon moves. This noise is distinct from the common, benign “pop” that occurs when a joint is cracked, which is a harmless release of gas bubbles. Crepitus, especially when accompanied by discomfort, points toward a physical interference with the tendon’s normal gliding motion.
What Causes the Grinding Sensation
The physical process generating this grating sound is linked to inflammation, often involving the tendon sheath, a condition known as tenosynovitis. Many tendons are encased in a protective layer called the synovial sheath, which contains fluid to ensure the tendon can glide freely over bone or muscle during movement. When this sheath becomes inflamed, it thickens and loses its smooth, lubricated quality.
The grinding sensation occurs because of increased friction. Instead of gliding smoothly, the irritated, sometimes roughened tendon surface or the thickened, constricted sheath rubs against itself as the muscle contracts and moves the joint.
Associated Symptoms and Medical Consultation
The presence of crepitus rarely occurs in isolation and typically appears alongside other physical symptoms of tendon irritation. Common signs include a dull ache or pain in the affected area, which often becomes more pronounced during activity. The area may also exhibit tenderness to the touch and mild, localized swelling.
If you notice this grating sound, especially if it is accompanied by increasing pain or stiffness, seek a professional medical evaluation. Consult a healthcare provider if the discomfort does not improve after a few days of rest, if the pain rapidly increases in severity, or if you experience a sudden inability to move the affected joint normally.