Wu TK, et al. - In this study, the authors investigated the data to study the biomechanical changes in the intermediate segment (IS) of the cervical spine after skip-level fusion or skip-level arthroplasty. They applied a 75-N follower load and 1.0-N·m moments to the top of the C2 vertebra to produce flexion, extension, lateral bending and axial rotation in the intact model. They noticed a decline in the ranges of motion (ROMs) of the fusion model at the operating levels, but the corresponding ROMs of the arthroplasty model were similar to those of the intact spine in all directions. Overall, they noticed no additive ROM or stress in the intervertebral disc or facet joints after skip-level arthroplasty in IS as it had seldom biomechanical effects on the IS as compared to skip-level fusion.