1. Introduction:
Arthroscopic knee surgery methods are frequently preferred treatment procedures and this is because they are minimally invasive and therefore provide early recovery (1). As in many surgical branches, the number and variety of minimally invasive / arthroscopic interventions in knee surgery are increasing with technological progress, as an indirect result of this, enhanced recovery after surgery stands out as an issue that needs to be seriously addressed for anesthetists and surgeons (2–4). With the increase in ultrasound technology and availability; regional anesthesia techniques are used and encouraged as part of multimodal analgesia in many surgical procedures (5,6).
The use of adductor canal block (ACB) as a part of multimodal analgesia in arthroscopic knee surgeries is an increasingly common practice due to the prediction that it may cause lower quadriceps weakness compared to femoral nerve block in arthroscopic knee surgeries and the claim that it can provide similar effects with lower volume (7–9). Considering the clinical studies and case series in the literature, it is seen that the drug concentration is 0.25% or above in almost all of the single shot ACB applications under ultrasound guidance (in those using bupivacaine) (7,10–13).
In this study, in patients undergoing arthroscopic minimally invasive knee surgeries; We aimed to evaluate the effects of ACB on the intensity of pain measured at different time points in the postoperative period and the need for analgesia in the first 24 hours, by comparing the effectiveness of fixed volume with two different concentrations of local anesthetics between the control group and themselves.