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J Am Acad Orthop Surg Glob Res Rev. 2019 Mar 19;3(3):e022. doi: 10.5435/JAAOSGlobal-D-19-00022. eCollection 2019 Mar.

Outcomes of the First 1,000 Total Hip and Total Knee Arthroplasties at a Same-day Surgery Center Using a Rapid-recovery Protocol.

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Summit Orthopedics, Woodbury, MN.



Outpatient (<24 hour stay) total joint arthroplasty (TJA) has emerged as an alternative to traditional inpatient TJA. Patient-reported outcomes in the past have revealed favorable comparisons with inpatient controls. However, a higher outpatient TJA readmission rate has been reported. The goal of our study is to report outcomes, readmissions, and unplanned access to care data on the first 1,000 TJAs performed at a de novo ambulatory surgery center (ASC).


From March 2014 to May 2016, a consecutive series of 1,000 primary, total hip, and total knee arthroplasties (TKAs) were performed at a same-day surgical center. All patients were ≤66 years old, met the ASC inclusion criteria, and received preoperative training. All patients were discharged <24 hours after surgery to postoperative care suites. Oxford scores, visual analog scale for pain, patient satisfaction, ambulation, complication, and adverse events data were collected.


A consecutive series of 543 TKAs and 457 total hip arthroplasties (THAs) were performed. Mean age was 57.2 years (range 28 to 66 years). The TKA patients consisted of 55.2% women, whereas THA patients consisted of 45.3% women. Overall infection rate was 0.8%. Hospital readmission rate was 1.5%, and early/unplanned access to care was 11.7%. Oxford Knee and Oxford Hip scores showed 15.7 and 21.1 point improvements, respectively, whereas pain scores improved 71% for TKA and 81% for THA at 6 months postoperatively (P < 0.01).


Our immediate and short-term complications, readmissions, and outcomes for all patients compared favorably with published inpatient data. This study provides baseline data for quality metrics and functional outcomes for ASC-based total joint procedures.

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