What causes the sensation of crepitus?

The sensation of crepitus is primarily caused by tendons sticking to surrounding structures. Crepitus refers to a grating, crackling, or popping sensation or sound that can be felt or heard during joint movement. This phenomenon occurs when tendons or ligaments rub against the cartilage or underlying bone, particularly when there is friction due to inflammation or degeneration in the joint area.

In joints where there is normal movement, tendons glide smoothly over surrounding tissue. However, if there is swelling or changes in the joint environment, the smooth gliding action can be disrupted, leading to the characteristic sound or sensation of crepitus. Understanding this mechanism is important for assessing joint health and identifying potential underlying issues, such as tendinitis or other soft tissue injuries.

The other options, while relevant to joint and muscle function, do not specifically result in the sensation of crepitus. Blood in the joint may indicate an injury but does not cause crepitus itself. Overactive muscle fibers or decreased nerve function can affect muscle control and coordination but do not directly relate to the grating sensation associated with tendons and surrounding structures.