title: Influence of partial lateral corpectomy with and without hemilaminectomy on canine thoracolumbar stability: a biomechanical study.
abstract: OBJECTIVE
  To analyze the biomechanical changes induced by partial lateral corpectomy (PLC) and a combination of PLC and hemilaminectomy in a T13-L3 spinal segment in nonchondrodystrophic dogs.
  
  
  METHODS
  In vitro biomechanical cadaveric study.
  
  
  METHODS
  T13-L3 spinal segments (n = 10) of nonchondrodystrophic dogs (weighing, 25-38 kg).
  
  
  METHODS
  A computed tomography (CT) scan of each T13-L3 spinal segment was performed. A loading simulator for flexibility analysis was used to determine the range of motion (ROM) and neutral zone (NZ) during flexion/extension, lateral bending, and axial rotation. A servohydraulic testing machine was used to determine the changes in stiffness during compression, dorsoventral, and lateral shear. All spines were tested intact, after PLC in the left intervertebral space of L1-L2, and after a combination of PLC and hemilaminectomy.
  
  
  RESULTS
  Statistically significant increases in ROM and NZ (P < .05) were detected during flexion/extension and lateral bending when PLC was performed. A significant increase in ROM (P < .001) was noted during axial rotation and flexion after PLC and hemilaminectomy. Stiffness decreased significantly during compression and dorsoventral shear after each procedure. Decreased stiffness during lateral shear was only significant after a combination of both procedures.
  
  
  CONCLUSIONS
  PLC might lead to some spinal instability; these changes are enhanced when a hemilaminectomy is added.
authors.affiliation: Small Animal Clinic, Department of Surgery and Radiology, University of Berne, Switzerland.
authors.forename: Núria
authors.initials: N
authors.lastname: Vizcaíno Revés
authors.forename: Alexander
authors.initials: A
authors.lastname: Bürki
authors.forename: Stephen
authors.initials: S
authors.lastname: Ferguson
authors.forename: Urs
authors.initials: U
authors.lastname: Geissbühler
authors.forename: Christina
authors.initials: C
authors.lastname: Stahl
authors.forename: Frank
authors.initials: F
authors.lastname: Forterre
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002102:Cadaver; D019245:Compressive Strength / Q000502:physiology; D004285:Dogs / Q000601:surgery*; D007403:Intervertebral Disc / Q000502:physiology; D007796:Laminectomy / Q000379:methods / Q000662:veterinary*; D008159:Lumbar Vertebrae / Q000601:surgery*; D009068:Movement / Q000502:physiology; D016059:Range of Motion, Articular / Q000502:physiology; D013904:Thoracic Vertebrae / Q000601:surgery*