A PEEK Rod-Based Dynamic Instrumentation Construct for the Degenerative Lumbar Spine Disease, First Appraisal Based...

Area of Science:

• Spine surgery
• Orthopedic technology
• Degenerative spine disease

Background:

• Adjacent segment disease (ASD) is a known complication after spinal fusion.
• Dynamic stabilization systems aim to reduce ASD by preserving motion at the index segment.
• Pedicle-based screw and rod systems offer alternatives to traditional fusion.

Purpose of the Study:

• To evaluate a pedicle-based dynamic screw and rod system for preventing adjacent segment disease (ASD).
• To assess the system's ability to maintain motion at the index segment and its impact on patient outcomes.
• To compare the dynamic system against standard decompressive surgery and fusion.

Main Methods:

• Retrospective study of 100 patients with lumbar spinal stenosis and degenerative spondylolisthesis.
• Patients underwent decompressive surgery with dynamic instrumentation.
• Functional X-rays before and after surgery, MRI scans, and patient demographics were analyzed.

Main Results:

• At 58 months follow-up, 43% of patients showed radiological adjacent segment disease (ASD).
• 80% of patients experienced symptom improvement or were pain-free.
• No significant correlation found between spinal canal area, gender, and outcome.

Conclusions:

• The dynamic system did not prevent ASD and showed no clear clinical benefit over standard fusion.
• Further studies are required to evaluate multi-segment instrumentation with this system.