You searched for: “acoustigram
acoustogram, acoustigram (s) (noun); acoustograms, acoustigrams (pl)
The graphic tracing of the curves, delineated in frequencies per second and decibel levels, of sounds produced by motion of a body joint: "When applied to a knee joint, an acoustogram will show the sound of the moving semilunar cartilages, the moving contact between the articular surfaces of the femur and tibia, and the circulation of the synovia."