Richard J M Reardon 1 , Robert Bailey , John P Walmsley , Jane Heller , Christoph Lischer Show Affiliations »
Abstract
OBJECTIVES: To (1) define mechanical properties in flexion, extension, and left lateral bending of cadaveric equine 4th and 5th cervical (C4-C5) articulations, (2) compare biomechanical properties of C4-C5 when stabilized with a kerf cut cylinder (KCC) compared with a ventrally placed 4.5 mm locking compression plate (LCP). STUDY DESIGN: In vitro biomechanical investigation. SAMPLE POPULATION: Cadaveric adult equine cervical vertebral columns (n=54). METHODS: Cervical vertebrae aged by horse dentition and size measured from radiographs were divided into 3 age groups then randomly allocated to 3 groups. The C4-C5 articulation was treated differently in each of the groups: KCC group; KCC-implanted LCP group; 8-hole 4.5 mm LCP implanted and intact group; no implant. Specimens were randomly subdivided into 1 of 3 loading conditions, before testing to failure under 4-point bending. Stiffness, yield bending moment, failure bending moment, and failure mode were recorded. General linear models were performed to analyze associations between biomechanical properties and test variables. RESULTS: All specimens failed at the C4-C5 intervertebral articulation. The cervical vertebrae with the LCP construct had significantly higher stiffness, yield bending moment, and failure bending moment than the KCC-implanted cervical vertebrae. Failure modes differed between groups and varied with loading direction: KCC group, fractures of C5 associated with the KCC were common; LCP group, screw pull out or fractures (of C4 and C5 bodies, during extension and the caudal aspect of C4 during left lateral bending) were common; and intact group, subluxations were most common. CONCLUSIONS: In this model, LCP constructs had superior biomechanical properties compared with KCC constructs. Further research investigating the effect of repetitive loading is indicated. © Copyright 2010 by The American College of Veterinary Surgeons.
OBJECTIVES: To (1) define mechanical properties in flexion, extension, and left lateral bending of cadaveric equine 4th and 5th cervical (C4-C5) articulations , (2) compare biomechanical properties of C4-C5 when stabilized with a kerf cut cylinder (KCC) compared with a ventrally placed 4.5 mm locking compression plate (LCP ). STUDY DESIGN: In vitro biomechanical investigation. SAMPLE POPULATION: Cadaveric adult equine cervical vertebral columns (n=54). METHODS: Cervical vertebrae aged by horse dentition and size measured from radiographs were divided into 3 age groups then randomly allocated to 3 groups. The C4-C5 articulation was treated differently in each of the groups: KCC group; KCC-implanted LCP group; 8-hole 4.5 mm LCP implanted and intact group; no implant. Specimens were randomly subdivided into 1 of 3 loading conditions, before testing to failure under 4-point bending. Stiffness, yield bending moment, failure bending moment, and failure mode were recorded. General linear models were performed to analyze associations between biomechanical properties and test variables. RESULTS: All specimens failed at the C4-C5 intervertebral articulation . The cervical vertebrae with the LCP construct had significantly higher stiffness, yield bending moment, and failure bending moment than the KCC-implanted cervical vertebrae. Failure modes differed between groups and varied with loading direction: KCC group, fractures of C5 associated with the KCC were common; LCP group, screw pull out or fractures (of C4 and C5 bodies, during extension and the caudal aspect of C4 during left lateral bending) were common; and intact group, subluxations were most common. CONCLUSIONS: In this model, LCP constructs had superior biomechanical properties compared with KCC constructs. Further research investigating the effect of repetitive loading is indicated. © Copyright 2010 by The American College of Veterinary Surgeons.
Entities: Chemical
Disease
Species
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Year: 2010
PMID： 20880140 DOI： 10.1111/j.1532-950X.2010.00733.x
Source DB: PubMed Journal: Vet Surg ISSN： 0161-3499 Impact factor: 1.495