Biomechanical comparison of ex vivo lumbar vertebral fracture luxations stabilized with tension band or polymethylmethacrylate in cats.
Journal
Veterinary surgery : VS
ISSN: 1532-950X
Titre abrégé: Vet Surg
Pays: United States
ID NLM: 8113214
Informations de publication
Date de publication:
Dec 2020
Dec 2020
Historique:
received:
18
01
2020
revised:
29
05
2020
accepted:
24
08
2020
pubmed:
1
10
2020
medline:
15
1
2021
entrez:
30
9
2020
Statut:
ppublish
Résumé
To evaluate spinal stabilization with tension band stabilization (TS) in cats compared to screw and polymethylmethacrylate fixation (SP). Ex vivo study. Sixteen feline thoracolumbar spinal specimens. The intact specimens were mounted in a six-degree-of-freedom biaxial testing machine for nondestructive testing to obtain the neutral zones (NZ) and range of motion (ROM) in flexion and extension. Thereafter, nondestructive testing was consecutively performed after destabilization by disc fenestration and partial L1 corpectomy and after treatment with either TS or SP. Load to failure was compared after surgical treatment in flexion. Significance was assessed by Student's t test or Wilcoxon signed-rank test. Range of motion was 26.4° ± 2.2° in TS constructs and 13.4° ± 2.1° in SP constructs (P = .0005). When flexion and extension were analyzed separately, no difference was found for ROM in flexion (SP, 7.0° ± 3.7°; TS, 8.3° ± 2.1°; P = .38). In extension, the mean displacement was 6.4° ± 2.7° and 18.1° ± 5.1° in SP and TS constructs, respectively (P = .0001). Neutral zone was 2.9° ± 0.6° and 7.5° ± 0.8° for the SP and TS groups, respectively (P = .0003). Screw and polymethylmethacrylate fixation constructs were two times stiffer (P = .045). Tension band stabilization provided stability comparable to SP in flexion. In extension, ROM of SP constructs was half that of TS constructs. The mode of failure of TS was related to the limited dorsal bone stock of feline lumbar vertebrae. Surgeons should be aware of the limited stability in extension provided by TS when it is used to stabilize thoracolumbar spinal injuries. Our results provide evidence to justify additional studies to clarify the type of fractures amenable to TS.
Substances chimiques
Polymethyl Methacrylate
9011-14-7
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1517-1526Informations de copyright
© 2020 American College of Veterinary Surgeons.
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