Biomechanical comparison of 2 veterinary locking plates to monocortical screw/polymethylmethacrylate fixation in the cadaveric canine cervical vertebral column
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Date
Authors
Hettlich, Bianca F.
Fosgate, Geoffrey Theodore
Litsky, Alan S.
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
OBJECTIVE : To assess biomechanical properties of 2 veterinary locking plates and
compare fixation among these plates and monocortical screws/polymethylmethacrylate (PMMA) fixation in cadaveric canine cervical vertebral columns. STUDY DESIGN : Biomechanical cadaveric study.
MATERIALS : Nineteen large breed cadaveric canine cervical vertebral columns (C2-C7) from skeletally mature dogs were used. A cortical ring was placed as disk spacer at C4-C5 in all specimens. Seven vertebral columns were implanted at C4-C5 with two 4-hole,3.5mm string of pearls plates (SOP) and 6 were implanted with two 6-hole, 2.4mm titanium locking reconstruction plates (Ti recon plate). All screws were placed monocortically. Six specimens were implanted with monocortical titanium screws and PMMA (Ti screws/PMMA), tested as part of a prior study. METHODS : Stiffness testing in 3 directions was performed of the unaltered C4-C5 vertebral motion unit and repeated after placement of the disk spacer and implant fixation. Data were compared using a linear mixed model that incorporated data from previously tested spines (Ti screw/PMMA). RESULTS :: The mean post-fixation stiffness (N/m) and 95% confidence intervals for SOP,
Ti recon plate and Ti screws/PMMA respectively were 407 (330,503), 284 (198,407) and 365 (314,428) in extension; 250 (178,354), 147 (106,204) and 311 (235,416) in flexion; and 528 (441,633), 633 (545,735) and 327 (257,412) in lateral bending. There were no significant differences in stiffness increase among the 3 fixation methods within any evaluated measurement directions. CONCLUSIONS : Monocortical fixation with two 3.5mm SOP and two 2.4mm Ti recon plates may offer an alternative fixation to monocortical screws and PMMA.
Description
Keywords
Biomechanical properties, Polymethylmethacrylate (PMMA), Monocortical screws, Veterinary locking plates, Cadaveric canine cervical vertebral columns, Dogs, Monocortical fixation
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Citation
Hettlich, BF, Fosgate, GT & Litsky, AS 2017, 'Biomechanical comparison of 2 veterinary locking plates to monocortical screw/polymethylmethacrylate fixation in the cadaveric canine cervical vertebral column', Veterinary Surgery, vol. 46, no. 1, pp. 95-102.