Fig 1.
Drawing of a monocoque plate-spacer device consisting of two plates and a box-shape spacer.
The spacer has small apertures allowing insertion of local autogenous bone chips and bone ingrowth for biological fixation. Reprinted from Neurol Med Chir (Tokyo). 2010;50(12):1132–6. under a CC BY license, with permission from Neurologia medico-chirurgia, original copyright 2010”.
Fig 2.
Schematic showing the device placement in laminoplasty.
A: Monocoque plate-spacer device B: Miniplate.
Fig 3.
Schematic of the applied compressive loads: Top Row: Transverse plane view. Bottom Row: Sagittal view of both load configurations. Column A shows the plate-space device test, and column B is the miniplate device test. FCC represents the force applied in the cranio-caudal direction. The loading point is shown as a black circle.
Fig 4.
Experimental setup: An aluminum plate is placed between the lamina and an indenter with a semispherical tip to avoid penetration of the indenter into the lamina.
Fig 5.
Failure mechanism of the laminoplasty reconstruct.
Red arrows: Fracture initiation at the upper corner of the hinge. A: Monocoque plate-spacer device. The laminoplasty reconstruct rotated mainly in the sagittal plane (arrow a). B: Miniplate. In addition to the rotation in the sagittal plane (arrow a), rotation in the coronal plane (arrow b) is observed. C: Macroscopic observation of fracture initiation at the upper corner of the hinge in the miniplate sample.
Fig 6.
Results of mechanical testing.
Error bar: standard deviation.