Biomechanical characteristics of a three-level cervical disc hybrid construct: An in vitro investigation

This article describes the rules of motion of a human cervical disc after a 3-level hybrid construct.7cadaveric cervical spines(C2-T1)were initially tested in intact condition.Then,all patients had a 1-level(C4-C5)total disc replacement(TDR)followed by a 2-level(C3-C4and C5-C6segments)anterior cervical discectomy and fusion(ACDF).The movement differences among the 3-level hybrid construct,the intact disc and the 1-level TDR were compared with the 3-level hybrid construct and previous 3-level fusion data(dynamic and static plating systems).The comparisons show that the 3-level hybrid construct performs better than3-level fusion.