# COMPARISON OF DYNESYS AND HYBRID SYSTEM FOR MULTI-SEGMENTAL LDD

## TL;DR

This study compares two surgical systems for treating multi-segmental lumbar degenerative disease and finds both are effective.

## Contribution

The novel contribution is a direct comparison of the Dynesys and Hybrid systems for multi-segmental LDD treatment outcomes.

## Key findings

- Both groups showed improved disability and pain scores, with reduced motion at operated segments.
- Dynesys preserved more range of motion but showed greater disc height loss in dynamic segments.
- No significant difference in complications was observed between the two groups.

## Abstract

To compare effectiveness of Dynesys and hybrid system in treating patients with multi-segmental lumbar degenerative disease (LDD).

Patients involved in this retrospective study were divided into Dynesys (n = 22) and Hybrid (n = 13) groups. Clinical outcomes were evaluated using Oswestry Disability Index (ODI), and Visual Analogue Scale (VAS). Radiologic evaluations included X-ray, MRI, and CT. Furthermore, different complications were analyzed.

At the last follow-up, ODI and VAS of each group were improved (p < 0.05), and the range of motion (ROM) of operating segments decreased. However, Dynesys group preserved a larger extent of ROM at the final follow-up (p < 0.05). ROM of the upper adjacent segment was increased in both groups (p < 0.05), while the disc heights were decreased at the final follow-up (p < 0.05). Besides, Dynesys group had a more obvious decrease in the disc height of dynamic segments (p < 0.05). No significant difference existed in complications between both groups (p > 0. 05).

In our study, similar satisfactory results were obtained in both groups. Both surgical procedures can be employed as effective treatments for middle-aged and physically active patients with multi-segmental LDD.
Level of Evidence III; Retrospective Comparative Study.