01 October 2019 : Clinical Research
Clinical Investigation of the Association of Opening Size with Sagittal Canal Diameter Based on Single-Door Cervical LaminoplastyChang-bo Lu1BCDEF, Xiao-jiang Yang1BEF, Jia-chang Wu2BCD, Yun-zhi Lin2BF, Hong-xun Sang2ACG*
Med Sci Monit 2019; 25:7370-7375
BACKGROUND: Many clinical studies have assessed the association of laminoplasty opening size (LOS) with sagittal canal diameter (SCD) based on single-door cervical laminoplasty (SDCL). Nevertheless, the “worn-off” lamina extracted in SDCL was neglected in these reports. We aimed to develop a simple mathematical model to analyze the relationship between the effective LOS and SCD, taking into consideration the worn-off lamina.
MATERIAL AND METHODS: A total of 106 patients treated by SDCL at our hospital were included in this study. Pre-operative and post-operative SCDs were assessed using a picture archiving and communication system (PACS) based on computed tomography scans. Mini-plate sizes as well as drill bit diameters were recorded in detail in order to determine the effective LOS for each vertebral lamina involved.
RESULTS: SCD in all patients was increased significantly after SDCL (P<0.01). A linear correlation was found between effective LOS and the post-operative SCD increment from C3 to C7 (R²>0.933, P<0.001). The 12 mm mini-plate was most often used in SDCL, accounting for 64.45% of all cases, whereas 10 mm and 16 mm mini-plates were the least used, accounting for 3.85% and 3.00%, respectively.
CONCLUSIONS: There is a strong linear correlation between effective LOS and the post-operative SCD increment. The SCD was increased by about 0.5 mm per mm increase in effective LOS. Thus, post-operative SCD could be precisely calculated and predicted, enabling the selection of optimal mini-plate prior to SDCL.
Keywords: Cervical Vertebrae, Spinal Canal, Spinal Cord Injuries, spondylosis
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