Mechanical testing is the investigation of the relationship between the structure and properties of a material. It is an avenue to evaluate the design of a structure-property correlation, where the design must conform to an agreed standard. In biomedical engineering, these mechanical tests are usually the investigation of biocompatible devices and biological tissues. The mechanical tests or simulations may involve joint or organ kinematics and load deformation characteristics of soft tissues. The biomechanics involved in the motion of the joints are complex and require an ability to simulate the contraction and antagonistic relaxation of the involved muscle groups. The majority of mechanical testing specifications are normally defined by standards organizations or published guidelines.