How Does the Addition of Adductor Canal Block to Local Infiltration Affect Recovery in Patients Undergoing Total Knee Arthroplasty? A Feasibility Study.

The use of periarticular injection and adductor canal block are well-established techniques used both in combination or in isolation in the management of postoperative pain for patients undergoing total knee arthroplasty. The aim of this study is to investigate whether combining these two techniques have an added benefit, compared to periarticular injection alone, with respect to quality of recovery, functional return, discharge readiness, and short and long term post-operative narcotic use.

Inclusion Criteria: 1. Patients requiring primary total knee arthroplasty 2. Patients interested in being part of the study 3. Eligible to receive spinal anesthesia Exclusion Criteria: 1. Age \< 18 years 2. BMI \> 40 kg/m2 3. Deemed unsuitable for regional anesthesia 4. Planned general anesthesia 5. Hepatic insufficiency/Intolerance to acetaminophen 6. Renal insufficiency (defined by eGFR \ 4 11. Surgery scheduled on a weekend