Implementation of a rapid recovery protocol in total knee arthroplasty. A randomized controlled trial.

Background: Rapid recovery (RP) in total knee arthroplasty may increase the functionality while reducing costs. The aim of this study is to prove the benefits of a rapid recovery program compared to our classic protocol.

Patients And Methods: We performed a RCT (NCT03823573) in patients undergoing otal knee arthroplasty. Intervention group (RP protocol) received local infiltration of levo-bupivacaine in the periarticular tissue and supervized ambulation 4-6h after surgery. Control (C) group received a femoral nerve block with levo-bupivacaine, while a drain was used. Ambulation after its removal. All the patients completed an Oxford Knee Score prior to surgery and 6 months after discharge. An ecodoppler to assess the presence of deep vein thrombosis was made one month after discharge. Minimum follow-up was of 6 months.

Results: A total of 175 patients were included in the trial (92 patients in the control group, 83 patients in the RP group). There were no differences in sex, age, implanted prosthesis, hemoglobin drop, need for transfusion, range of motion on discharge (C: 82.6°, RP: 85°) and at the end of the follow-up (C: 105.1, RP: 106.6), Oxford Knee Score improvement (C: 17.5 points; RP: 19.3 points), patient satisfaction or re-admissions at the emergency department (C: 7.6%; RP: 10.8%). Significancy was found on time of ischemia (C: 81.29min; RP: 85.35min; P=0.03), need for morphine shots (C: 19.7%; RP: 38.6%; P=0.007), hospital stay (C: 3.84 days; RP: 2.54 days, P<0.0001) and time until ambulation (C: 2.46 days; RP: 0.23 days; P<0.0001).

Conclusion: Rapid recovery protocols can reduce hospital stay without increasing complications or need for re-admission.