- The spinous processes, laminae and their interconnecting ligaments were removed en bloc.
- The laminae and ligamenta flava were cut medially to the facet joints using a T-saw.
- The supra- and inter-spinous ligaments were preserved as much as possible. After tumour resection, the removed posterior elements were reattached to the superior and inferior processes using anchoring sutures
- Proximal facet joints were carefully spared
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