Biomechanical comparison after in vitro laminar vertebral stabilization and vertebral body plating of the first and second lumbar vertebrae in specimens obtained from canine cadavers

Abstract

Analysis of in vitro results suggested that laminar stabilization of vertebral segments provided greater stiffness than did vertebral body plating.

Lumbosacral Biometrics and its Relevance to Patient-Specific Evaluation of Bone Mechanical Strength in Some Canine Breeds

“…This observation suggests that some breeds have a mismatch in the mechanical properties of L7 and the sacrum and it remains to be seen if such a mismatch may be responsible for the higher incidence of lumbosacral defects. [1,6,9,[11][12][13]16,19 In addition to inter-breed differences, we also observed significant intra-breed variations in the AMR and HLR of L7 and the sacrum. Although this study wasn't adequately powered to assess the intra-breed variations, it is nevertheless interesting to evaluate if AMR and HLR of L7 and the sacrum would prove to be valuable in assessing bone mechanical properties of an individual patient.…”

“…Although bone is a multicellular unit, its primary function is to offer mechanical load-bearing and provide anchorage to skeletal muscles. 3,[6][7][8]13,17 It is imperative that bone is dynamically subjected to stress and strain mechanics. 9,10 Thus, each bone has an innate strain threshold, which when compromised will lead to fracture/s and bone deformity.…”

“…[6][7][8][9][10] Subsequent stress that is placed on the joint and the lumbosacral intervertebral disc uniquely predisposes animals to degenerative diseases, comparable to those that cause lower back pain in humans. 6,[10][11][12][13][14] Several large and giant breeds of dogs are prone to serious conditions affecting the lumbosacral region, with some breeds being more predisposed than others due to a combination of genetic and environmental factors; for example, hip dysplasia affecting German Shepherds, Labrador Retrievers and Golden Retrievers and Lumbosacral Stenosis affecting Boxers. In addition, the mobility of the lumbosacral joint and its function in force transmission makes L7 and the sacrum prone to fracture, frequently because of trauma to the area.…”

Biomechanical comparison of ex vivo lumbar vertebral fracture luxations stabilized with tension band or polymethylmethacrylate in cats

“…In previous models, researchers either incised only the intervertebral disc or included a facet joint destabilization. [8][9][10][11]…”

“…Nondestructive testing was performed first to obtain the NZ and the ROM. 8 The NZ was defined as the difference in angulation between the two phases of motion, flexion and extension at zero torque. Range of motion was measured as the peak-to-peak displacement difference between the minimum (−1 N/m) and the maximum (1 N/m) loads.…”