Safety and Feasibility of Internal Fixation Using Bioabsorbable Versus Titanium Materials for Short-Level Lamina Reimplantation: A Comparative Clinical Study.

Objective: Lamina-implantation is gradually becoming the main surgical method for the treatment of intraspinal tumors. Traditional titanium (Ti) internal fixation not only produces artifacts, which affects the observation of tumors and dural sac closure, but also faces the problem of secondary surgical removal. In this study, absorbable material were used in lamina replantation for the first time and was evaluated for its efficacy and safety.

Methods: We retrospectively enrolled patients who underwent short-segment lamina replantation for intraspinal tumors in our center from February 2020 to November 2022. After condition matching of the number of fixation segment and fixation position, the baseline information, complications, neurological function, quality of life, spinal mobility and bone healing rate of the absorbable group and the Ti group were compared. Fisher exact, Chi-square, or rank sum test were used for categorical variables, and t-test was used for continuous variables to distinguish differences between groups.

Results: Cerebrospinal fluid leak was the most common complication, with no difference between the two groups (12.9% vs. 19.4%, p = 0.366). The bone healing rates of the two groups at 3 months after surgery were 77.4% and 87.1%, respectively, and there was no significant difference (p = 0.508). At 1 year after surgery, the resorbable group showedlower levels of anxiety/depression (1.20 ± 0.41 vs. 1.61 ± 0.61, p = 0.050), however, it did not affect the overall quality of life of the patients at 1 year.

Conclusion: Both titanium and absorbable internal fixation have shown good clinical results in the treatment of intraspinal tumors by laminareplantation. Regardless of cost, absorbable screws and plates are also suitable options for patients undergoing lamina replantation, because it has no stress shielding effect and does not require secondary removal. In addition, there are no artifacts in the image, which is more conducive to observing the recurrence of the tumor and the closure of the dural sac.