Akademik Veri Yönetim Sistemi
Journal of Turkish Spinal Surgery, cilt.35, sa.4, ss.145-150, 2024 (Scopus)
Objective: The purpose of this study was to evaluate the stability and loosening of the Midfix device under complex cyclic loading with the resection of interspinous and supraspinous ligaments. Materials and Methods: A biomechanical study of motion analysis and cyclic loading on six fresh-frozen lamb spines was conducted. Specimens were divided into three groups: control, destabilized, and midfix groups. The excision of interspinous and supraspinous ligaments was performed in the destabilized and Midfix groups. Axial loads of 400 N were applied to the spine, and an increased moment of up to 8400 N-mm was generated through the axial movement to achieve the flexion-extension (FE) and right-left bending (LB) motions. During testing, the extensometer recorded the intervertebral displacement at decompression levels L4-5. According to the analysis, the value for which p<0.05 was considered statistically significant. Results: Implantation of the ISD (Interspinous Device) to strengthen segment stabilization resulted in a significant decrease in the range of motion of 43.2% in extension, 57.8% in flexion, and 25.6% in LB, yet an increase in right bending by 25.6%. A comparison between the intact spine and Midfix groups revealed significant differences in the range of motion in FE and LB. However, there were no statistically significant differences in right bending. Conclusion: The Midfix device stabilized the segments after resecting the interspinous and supraspinous ligaments. In addition, Midfix was more effective in flexion and extension than the other loading modes. Therefore, the lack of a stabilizing effect in bending should be carefully considered.