Background: The outcome of knee surgery is influenced by the surgery itself and the rehabilitation program. Post-operative pain management is the most important factor for a successful rehabilitation program. We hypothesized that an adductor canal block (ACB) in the outpatient clinic is safe, effective for pain relief, and decreases analgesic consumption.
Methods: We included patients who underwent knee surgery. Patients were scheduled to an ACB on post-operative day (POD) 14 at the outpatient clinic with 0.1% ropivacaine. We evaluated pain with the use of a visual analogue scale (VAS) and analgesic consumption on PODs 5, 7, 9, 15, 17, 19, 21, 23, 25, 27, and 29.
Results: We enrolled 115 patients. The mean VAS pain scores before ACB on PODs 5, 7, and 9 were 7.4, 7.2, and 6.2, respectively. After the patients received the ACB on POD 14, the mean VAS pain score significantly decreased to 1.6, then gradually increased at PODs 17, 19, 21, and 23. After POD 23, the VAS pain score flattened. Patients’ mean analgesic (etoricoxib) consumption before receiving the ACB on PODs 5, 7, and 9 were 102 mg, 98 mg, and 98 mg, respectively. After receiving ACB, analgesic consumption significantly decreased (16 mg) on POD 15, then gradually increased on PODs 17, 19, and 21. After POD 21, analgesic consumption stabilized.
Conclusions: Single-shot ACB in the outpatient clinic is safe and significantly decreases pain and analgesic consumption and may enhance rehabilitation programs.