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Comparison of the biomechanical properties of a ventral cervical intervertebral anchored fusion device with locking plate fixation applied to cadaveric canine cervical spines


  • Funded in part by the Specialization Commission (SpezKo) of the Vetsuisse Faculty of the University Berne, Switzerland.

Corresponding Author

Bernhard Schöllhorn, DVM, Department of Small Animal Surgery and Clinical Veterinary Medicine, Vetsuisse Faculty, University of Berne, Laenggasse 128, CH-3001 Berne, Switzerland. E-mail:



To evaluate fixation properties of a new intervertebral anchored fusion device and compare these with ventral locking plate fixation.

Study Design

In vitro biomechanical evaluation.


Cadaveric canine C4–C7 cervical spines (n = 9).


Cervical spines were nondestructively loaded with pure moments in a nonconstraining testing apparatus to induce flexion/extension while angular motion was measured. Range of motion (ROM) and neutral zone (NZ) were calculated for (1) intact specimens, (2) specimens after discectomy and fixation with a purpose-built intervertebral fusion cage with integrated ventral fixation, and (3) after removal of the device and fixation with a ventral locking plate.


Both fixation techniques resulted in a decrease in ROM and NZ (P < .001) compared with the intact segments. There were no significant differences between the anchored spacer and locking plate fixation.


An anchored spacer appears to provide similar biomechanical stability to that of locking plate fixation.