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Drivers of Cost in Primary Single-Level Lumbar Fusion Surgery.
Global Spine Journal 2021 April 10
STUDY DESIGN: Retrospective cohort.
OBJECTIVES: Allocating cost is challenging with traditional hospital accounting. Time-driven activity-based costing (TDABC) is an efficient method to accurately assign cost. We sought to characterize the variation in direct total hospital cost (THC) among both lumbar fusion approaches and surgeons.
METHODS: Patients were treated with single-level anterior interbody (ALIF), lateral interbody (LLIF), transforaminal interbody (TLIF), instrumented posterolateral (PLF) or in-situ fusion (ISF) for degenerative disease. Process maps were developed for preoperative, intraoperative and postoperative care. THC was composed of implant, medication, other supply, and personnel costs. Linear regression and descriptive statistics were used to analyze THC variation.
RESULTS: A total of 696 patients underwent surgery by 8 surgeons. Approximately 50% of THC variation was associated with procedure choice while patient characteristics explained 10%. Implants (including biologics) accounted for 45% of cost. With reference to PLF, THC ranged from 0.6x (ISF) to 1.7x (LLIF). Implant cost ranged from 2.5x reference (LLIF) to 0.1x (ISF). There was a 1.7x difference between the highest THC surgeon and the lowest. The fusion type with the highest THC variation was TLIF. The surgeon with the highest TLIF THC was 1.5x more expensive than the surgeon with the lowest.
CONCLUSIONS: Surgeon-based choices have the greatest effect on THC variation and represent the largest opportunities for cost savings. Primary single-level lumbar fusion THC is driven primarily by fusion type. Implants, including biologics, account for nearly half this cost. Future work should incorporate outcomes data to characterize the differential value conferred by higher THC fusions.
OBJECTIVES: Allocating cost is challenging with traditional hospital accounting. Time-driven activity-based costing (TDABC) is an efficient method to accurately assign cost. We sought to characterize the variation in direct total hospital cost (THC) among both lumbar fusion approaches and surgeons.
METHODS: Patients were treated with single-level anterior interbody (ALIF), lateral interbody (LLIF), transforaminal interbody (TLIF), instrumented posterolateral (PLF) or in-situ fusion (ISF) for degenerative disease. Process maps were developed for preoperative, intraoperative and postoperative care. THC was composed of implant, medication, other supply, and personnel costs. Linear regression and descriptive statistics were used to analyze THC variation.
RESULTS: A total of 696 patients underwent surgery by 8 surgeons. Approximately 50% of THC variation was associated with procedure choice while patient characteristics explained 10%. Implants (including biologics) accounted for 45% of cost. With reference to PLF, THC ranged from 0.6x (ISF) to 1.7x (LLIF). Implant cost ranged from 2.5x reference (LLIF) to 0.1x (ISF). There was a 1.7x difference between the highest THC surgeon and the lowest. The fusion type with the highest THC variation was TLIF. The surgeon with the highest TLIF THC was 1.5x more expensive than the surgeon with the lowest.
CONCLUSIONS: Surgeon-based choices have the greatest effect on THC variation and represent the largest opportunities for cost savings. Primary single-level lumbar fusion THC is driven primarily by fusion type. Implants, including biologics, account for nearly half this cost. Future work should incorporate outcomes data to characterize the differential value conferred by higher THC fusions.
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