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Differences in Pain,Opioid Use,and Function Following Unicompartmental Knee Arthroplasty compared to Total Knee Arthroplasty
Institution:1. Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA;2. Department of Orthopaedic Surgery, Newton-Wellesley Hospital, Newton, MA;1. Department of Orthopedic Surgery, Ochsner Health System, New Orleans, LA;2. Center for Applied Health Services Research, Ochsner Medical Center, New Orleans, LA;3. Hospital for Special Surgery, Ault Reconstruction and Joint Replacement, New York, NY;1. University of Michigan Medical School, Ann Arbor, MI;2. Department of Surgery, University of Michigan, Ann Arbor MI;3. Michigan Opioid Prescribing Engagement Network, Ann Arbor, MI;4. Department of Urology, University of Michigan, Ann Arbor, MI;5. Department of Orthopedic Surgery, University of Michigan, Ann Arbor, MI;6. Michigan Surgical Quality Collaborative, Ann Arbor, MI
Abstract:BackgroundWe sought to determine if immediate postsurgical pain, opioid use, and clinical function differed between unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA).MethodsA single-institution database was utilized to identify patients who underwent elective total joint arthroplasty between 2016 and 2019.ResultsIn total, 6616 patients were identified: 98.20% TKA (6497) and 1.80% (119) UKA. UKA patients were younger, had lower body mass index, and more often male than the TKA cohort. Aggregate opioid consumption (75.94 morphine milligram equivalents vs 136.5 morphine milligram equivalents; P < .001) along with the first 24-hour and 48-hour usage was significantly less for UKA as compared to TKA. Similarly, pain scores (1.98 vs 2.58; P < .001) were lower for UKA while Activity Measure for Post-Acute Care mobilization scores were higher (21.02 vs 18.76; P < .001). UKA patients were able to be discharged home on the day of surgery 37% of the time as compared to 2.45% of TKA patients (P < .0001). Notably, when comparing UKA and TKA patients who were discharged home on the day of surgery, no differences regarding pain scores, opioid utilization, or mobilization were observed.ConclusionUKA patients are younger, have lower body mass index and American Society of Anesthesiologists scores, and more often male than TKA patients. UKA patients had significantly shorter length of stay than TKA patients and were discharged home more often than TKA patients, on both the day of surgery and following hospital admission. Most notably, UKA patients reported lower pain scores and were found to require 45% lower opioid medication in the immediate postsurgical period than TKA patients. Surprisingly, UKA and TKA patients discharged on the day of surgery did not differ in terms of pain scores, opioid utilization, or mobilization, suggesting that our rapid rehabilitation UKA protocols can be successfully translated to outpatient TKAs with similar outcomes.Level III EvidenceRetrospective Cohort Study.
Keywords:unicompartmental knee arthroplasty  total knee arthroplasty  same-day discharge  opioids  mobilizations  outcomes
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