Effect of an intervertebral disk spacer on stiffness after monocortical screw/polymethylmethacrylate fixation in simulated and cadaveric canine cervical vertebral columns.

Hettlich, Bianca Felicitas; Allen, Matthew J; Glucksman, Gabriela S; Fosgate, Geoffrey T; Litsky, Alan S (2014). Effect of an intervertebral disk spacer on stiffness after monocortical screw/polymethylmethacrylate fixation in simulated and cadaveric canine cervical vertebral columns. Veterinary surgery, 43(8), pp. 988-994. Wiley-Blackwell 10.1111/j.1532-950X.2014.12165.x

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OBJECTIVE

To determine the biomechanical effect of an intervertebral spacer on construct stiffness in a PVC model and cadaveric canine cervical vertebral columns stabilized with monocortical screws/polymethylmethacrylate (PMMA).

STUDY DESIGN

Biomechanical study.

SAMPLE POPULATION

PVC pipe; cadaveric canine vertebral columns.

METHODS

PVC model-PVC pipe was used to create a gap model mimicking vertebral endplate orientation and disk space width of large-breed canine cervical vertebrae; 6 models had a 4-mm gap with no spacer (PVC group 1); 6 had a PVC pipe ring spacer filling the gap (PCV group 2). Animals-large breed cadaveric canine cervical vertebral columns (C2-C7) from skeletally mature dogs without (cadaveric group 1, n = 6, historical data) and with an intervertebral disk spacer (cadaveric group 2, n = 6) were used. All PVC models and cadaver specimens were instrumented with monocortical titanium screws/PMMA. Stiffness of the 2 PVC groups was compared in extension, flexion, and lateral bending using non-destructive 4-point bend testing. Stiffness testing in all 3 directions was performed of the unaltered C4-C5 vertebral motion unit in cadaveric spines and repeated after placement of an intervertebral cortical allograft ring and instrumentation. Data were compared using a linear mixed model approach that also incorporated data from previously tested spines with the same screw/PMMA construct but without disk spacer (cadaveric group 1).

RESULTS

Addition of a spacer increased construct stiffness in both the PVC model (P < .001) and cadaveric vertebral columns (P < .001) compared to fixation without a spacer.

CONCLUSIONS

Addition of an intervertebral spacer significantly increased construct stiffness of monocortical screw/PMMA fixation.

Item Type:	Journal Article (Original Article)
Division/Institute:	05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) 05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic > Small Animal Clinic, Surgery 05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic
UniBE Contributor:	Hettlich, Bianca Felicitas
Subjects:	500 Science 600 Technology > 610 Medicine & health
ISSN:	0161-3499
Publisher:	Wiley-Blackwell
Language:	English
Submitter:	Bianca Felicitas Hettlich
Date Deposited:	31 Mar 2016 09:23
Last Modified:	05 Dec 2022 14:52
Publisher DOI:	10.1111/j.1532-950X.2014.12165.x
PubMed ID:	24512474
URI:	https://boris.unibe.ch/id/eprint/77332