Researchers examined nine cadaveric cervical spines under load- and displacement-control testing and found the external fixator device simulating fusion significantly reduced the range of motion at C4-C5 and C6-C7. The range of motion returned after removing the fusion construct.
Arthroplasty using the porous-coated motion disc at C5-C6 maintained total flexion-extension ROM. Two-level fusions significantly increase motion demands on nonoperative segments when compared with the TDR and fusion construct.
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