The Biomechanical Analysis On Hydroxyapatite Cervical Intervetebral Disc

Objective: This experiment designed and manufactured the HA-coated cervical intervertebral disc prosthesis. The biomechanical analysis was undertoken by implanting HA-coated CIDP into C5-6 level of cadaveric model. The level's ROM and IDPs operated with CIDP in the condition of loading movement was observed by pro and post operation, and compared with the ROM and IDPs operated with anterior cervical plate system. The data would direct the design, manufacture and operation ,and the possibility of using artificial cervical invertebral disc prosthesis in clinical was also studied.Methods: According to the geometric measurement for cervical cadaveric model, The CIDP was designed by low friction sliding made the surfaces between the upper and lower two CIDP. This design made CIDP have the ability of movement about three axis. The prosthesis part was made by Ti alloy, and the surface was painted with HA,while the sliding core was made by ultro-high molecular polyethylene. Totally 12 adult cervical vertebra were used in the experiment, and they were randomly divided into 3 groups: normal group(A group), total disc replacement group(B group) and allograft + anterior cervical plate(C group). The models were tested by the cervical three-dimensional movement machine and three-dimensional test system. Biomechanical test recorded the range of motion (ROM) of flexion/extension, lateral bending and axis rotation for the C4-5,C5-6 and C6-7 under 5Nm periodicity torque load-0.1Nm per second. At the same time the IDPs were calculated for the C4-5, C6-7 in three groups. The data of this experiment was compared with each...