Researchers simulated two level fusions and TDR eight human cadaveric cervical spines and found a significant reduction in the range of motion at C4-C6. When the fusion construct was removed, the motion response was restored. The C3-C4 TDR showed less motion when compared with the intact segment when the implants were placed either as a stand-alone procedure or above a two-level fusion.
Researchers also found that the lordic fusion required greater flexion moment and the straight fusion required more extension moment.
Read the abstract about total disc replacement in the cervical spine.
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