[Biophysical properties of the articular disc tissue and their functional evaluation].

Acoustic methods (measuring the speed of sound) and separate measurements of the density of 10 fresh, unfixed discs at the anterior, central and posterior band were used to determine the module of elasticity. The values of 2634 to 3217 N/mm2 demonstrate the high resistance of the articular disc to elastic deformation. The consequences relating to the function, dysfunction and treatment of internal derangements are discussed.