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Article Abstract
Introduction: Lumbar disk arthroplasty (LDA) is a relatively novel procedure with limited indications and use in the United States, especially relative to lumbar fusion (LF). This study aimed to determine surgical trends between LDA versus LF over the past 10 years to quantify absolute/relative surgical volume over time and compare baseline patient demographics, readmission, 2-year revision rates, and costs-of-care.
Methods: A total of 714,268 patients were identified from a nationwide database who underwent LF (n = 710,527) or LDA (n = 3,741) from 2010 to 2021. The percentage of patients managed by each surgical procedure was calculated overall and subdivided annually. Baseline demographics were compared between surgical groups, comparing postoperative readmission rates and 2-year revision rates. Linear regression modeling was done to evaluate trends/differences in procedural volume by year.
Results: Beginning in 2010 to 2011, LDA constituted 1.0% of procedures, before the number/proportion of LDA procedures to LF has slowly dropped (1% in 2010 to 0.6% in 2021, P > 0.05). Patients undergoing LDA were younger (42.7 vs. 60.9 years, P < 0.0001) with a higher male proportion (50.9 vs. 42.8, P < 0.0001) and a lower Elixhauser Comorbidity Index (2.5 vs. 4.6, P < 0.0001). Patients undergoing LDA had lower rates of readmission (3.8 vs. 7.6%, P < 0.0001). Both LDA and LF average same-day reimbursements elevated sharply from 2010 to 2015 before decreasing to values lower than initially at 2010, with LF demonstrating a greater reduction in costs ($10,600 vs. $2,600, P < 0.05), although LDA remains cheaper ($2,900 vs. $5,300, P < 0.05).
Conclusion: The surgical volume of LDA has remained steady while dropping in proportion relative to LF over the past decade. Although patients undergoing LDA are younger and have both fewer baseline demographic comorbidities and lower readmission rates, surgeons remain hesitant to perform this procedure over LF.
Study Design: Retrospective Cohort Study, Level III Evidence.
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