Fig 1.
Abbreviations: OA: osteoarthritis; RATKA: robotic-arm assisted total knee arthroplasty.
Table 1.
Model input parameters.
Table 2.
Results for base case analysis.
Fig 2.
Annual case volume and INMB of robotic-arm assisted TKA.
Abbreviations: INMB: incremental monetary net benefit; TKA: total knee arthroplasty. Note: The INMB willingness-to-pay (WTP) threshold was assumed to be $50,000 per QALY. INMB was calculated as incremental QALYs × WTP − incremental costs. Robotic-arm assisted TKA was cost-effective when case volume exceeded 49 cases per year.
Fig 3.
Abbreviations: INMB: incremental monetary net benefit; TKA: total knee arthroplasty. Note: INMB tornado diagram for multiple 1-way sensitivity analyses. The INMB willingness-to-pay (WTP) threshold was assumed to be $50,000 per QALY. INMB was calculated as incremental QALYs × WTP−incremental costs. The importance of each model input on the economic conclusion is presented from top to bottom. The tails of each bar indicate the maximum and minimum INMB for each variable. A positive INMB indicates that the robotic-arm assisted TKA is cost-effective compared with conventional TKA at the given willingness-to-pay threshold.