Comparative effectiveness research across two spine registries

Area of Science:

• Spine surgery outcomes research
• Comparative effectiveness of spinal interventions
• Patient-reported outcome measures in orthopedics

Background:

• Comparative effectiveness research in spine surgery remains limited.
• This study compares pain and quality of life (QoL) after lumbar total disc arthroplasty (TDA) and anterior lumbar interbody fusion (ALIF).
• Outcomes were anonymously assessed by surgeon and implant.

Purpose of the Study:

• To compare pain alleviation and QoL improvement between TDA and ALIF.
• To investigate the influence of surgeon patient selection on surgical outcomes.
• To identify potential differences in the application of TDA based on patient symptom severity.

Main Methods:

• Analysis of 534 monosegmental TDAs from the SWISSspine registry and 50 ALIF cases from the Spine Tango registry.
• Comparison of back/leg pain alleviation and QoL improvement at a 1-year follow-up.
• Calculation of probabilities for achieving minimum clinically relevant improvements for each surgeon.

Main Results:

• Both TDA and ALIF demonstrated significant reductions in back pain (average 39-point decrease) and improvements in QoL (average 0.40-point increase) at 1 year.
• ALIF showed comparable pain alleviation to TDA.
• Surgeons exhibited variations in patient selection, with some demonstrating better outcomes by selecting patients with higher symptom severity.

Conclusions:

• Pain alleviation is similar between TDA and ALIF.
• Significant differences in surgeon patient selection strategies were observed.
• Some surgeons may not fully leverage TDA's potential by selecting patients with less severe symptoms.