Long-Term Outcomes Following Lumbar Nucleus Replacement

Area of Science:

• Spine surgery
• Biomedical engineering
• Orthopedic research

Background:

• Nucleus replacement devices (NRDs) aim to alleviate pain by replacing the damaged disc nucleus while preserving spinal structures.
• The DASCOR device, previously available, demonstrated clinical efficacy but is no longer marketed.
• Renewed interest in NRDs necessitates evaluating long-term outcomes of earlier devices like DASCOR.

Purpose of the Study:

• To assess the long-term clinical and radiological outcomes of the DASCOR nucleus replacement device.
• To evaluate the safety and efficacy of NRDs in treating discogenic low back pain in a younger patient population.

Main Methods:

• Retrospective review of hospital records for patients who received DASCOR implants (2006-2009).
• Collection of clinical data including Visual Analog Scale (VAS) for pain, Oswestry Disability Index (ODI), and analgesic use.
• Systematic evaluation of MRI scans for disc height, Modic changes, Pfirrmann grade, and adjacent segment degeneration.

Main Results:

• Follow-up data from 22 patients showed significant long-term improvements in VAS, ODI, and analgesic use (P < 0.0001).
• 14 patients with mean 11.5-year follow-up demonstrated sustained clinical benefits.
• 46% of patients developed adjacent segment degeneration; 6 required revision at the index level, and 3 at adjacent levels.

Conclusions:

• A subset of patients achieved excellent long-term clinical and radiological outcomes with the DASCOR device.
• The study highlights the potential of NRDs for discogenic low back pain in younger individuals.
• Further investigation into NRDs is crucial for optimizing treatment strategies.