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Updated: Jan 8, 2026
The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
Published on: September 7, 2022
El cambio a artroplastia total de cadera y rodilla ambulatoria: el trabajo perioperatorio no ha cambiado
Hunter Warwick1, Neeku Salehi1, David N Kugelman1
1Department of Orthopaedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, 33 S 9(th) St, Philadelphia, PA 19107.
Background:
Total hip (THA) and knee arthroplasty (TKA) are increasingly being performed on an outpatient basis. Due to this shift in the site of service, the volume and complexity of the work required for these procedures may be affected. The purpose of this study was to quantify the amount of perioperative work performed by the surgeon and advanced practice providers for same-day THA and TKA.
Methods:
We prospectively timed pre-service, immediate post-service, and discharge coordination activities for a consecutive series of 96 outpatient cases over a four-week period. Timing data for activities performed in the operating room (OR) were obtained retrospectively from our institutional electronic medical record for 500 patients who underwent THA and 500 who underwent TKA. Results were compared with the current approved values reviewed by the Relative Value Scale Update Committee (RUC) in 2019. Cases were also separated into those performed in tertiary care hospitals, specialty hospitals, and ambulatory surgical centers (ASCs) to compare perioperative work by surgical setting.
Results:
The average pre-evaluation time was 43.9 ± 7.3 minutes. The average time from the patient entering the OR to incision was 39.0 ± 9.8 minutes. Immediate post-service tasks took 26.6 ± 7.2 minutes, and discharge coordination tasks took 122.1 ± 33.9 minutes. Overall, tasks measured took 231.6 minutes and were allotted only 208 minutes by the 2019 RUC. All phases of perioperative work took longer at ASCs relative to other settings, particularly discharge coordination, which took an average of 140.3 minutes (P = 0.043).
Conclusion:
Outpatient THA and TKA require at least the same amount of perioperative work as traditional inpatient arthroplasty. Further, our results suggest surgical teams are doing more work than is currently valued by the RUC. Policymakers should take this information into consideration while evaluating TKA and THA as these procedures continue to move to the outpatient setting.
