Crepitus

Crepitus () or crepitation is "a grating sound or sensation produced by friction between bone and cartilage or the fractured parts of a bone".

Various types of crepitus that may be heard in joint pathologies are:

• Bone crepitus: This may be heard when two fragments of a fracture are moved against each other.
• Crepitus of bursitis: This is heard when the fluid in the bursa contains small, loose fibrinous particles.
• Crepitus of tenosynovitis: This may result from inflammation of the fluid-filled sheath (synovium) that surrounds a tendon.