Outpatient total hip and knee arthroplasty exhibit similar early complication rates to inpatient procedures.

PURPOSE: The purpose of this study was to compare early post-operative complications and readmissions between total joint arthroplasty (TJA) patients completed as outpatient versus inpatient procedures.

METHODS

A review of 2648 primary total hip arthroplasty (THA) and total knee arthroplasty (TKA) patients between 2015 and 2019 was performed. Patients who underwent same-day discharge were matched to the inpatient cohort using age, gender, body mass index (BMI), and smoking status. American Society of Anesthesiologists (ASA) Scores were calculated for the two cohorts. A total of 234 matched pairs (468 knees) for the TKA cohort and 132 matched pairs (264 hips) for the THA cohort were identified. Data was collected for six months after surgery for 30- and 90-day readmissions, the occurrence of reoperations, revisions, deep vein thrombosis (DVT), pulmonary embolism (PE), falls within 90 days, fractures, infections and dislocations.

RESULTS

The average age for TJA patients was 60 years, with an average BMI of 32, 58% females, and 51.5% who reported never smoking. Post-operative fall risk was higher in the inpatient TKA cohort compared to the same-day cohort (3.0% vs 0.4%, p = 0.032) as was the risk of 90-day readmission (6.0% vs 2.1%, p = 0.034), respectively. These differences were also observed in the combined THA and TKA cohorts.

CONCLUSIONS

We report no increase in reoperations, revisions, 30 or 90-day readmissions, deep vein thrombosis (DVT), pulmonary embolism (PE), fractures, infections or dislocations in the outpatient cohort. Early complications and readmissions of patients who underwent TJA as same-day surgeries compared favorably to a matched cohort of inpatients.