The Quality of Recovery 40 (QoR-40) is a multidimensional questionnaire that addresses many aspects of postoperative recovery. The QoR-40 has been used many times to measure the recovery of patients after different surgeries, and this questionnaire seems to be a reliable tool for evaluating anesthesia-related techniques, including regional anesthesia. Arthroscopic knee surgery causes moderate to severe postoperative pain for most patients. Various methods such as different systemic drugs, peripheral or central blocks and intra-articular injections have been developed for the effective, safe and long-term control of this pain. In recent years, it has been shown that regional anesthesia techniques reduce the need for opioids in orthopedic ambulatory surgeries and accelerate recovery and discharge. However, there is no consensus on which is the best approach among these various regional techniques. However, adductor canal block (ACB) and intrathecal morphine (ITM) are the preferred regional methods in the perioperative pain management of knee surgery. In this study, it was aimed to test the effectiveness of intrathecal morphine or adductor canal block added to spinal anesthesia on the quality of recovery in patients undergoing arthroscopic anterior cruciate ligament reconstruction surgery.

Inclusion Criteria:

• American Society of Anesthesiologists (ASA) physical status I or II adult patients aged 18-65 years undergoing elective arthroscopic anterior cruciate ligament reconstruction will be included in the study.

Exclusion Criteria:

• We will exclude patients with known coagulopathy, allergies to the studied drugs, obesity (BMI >35kg/m2), renal and/or hepatic insufficiency, chronic pain syndrome, mental impairment, depression, chronic alcoholism, and usage of antidepressant and analgesic drugs before surgery.

Participant code, age, weight, height and information during surgery will be recorded. This information will not be shared with any person or organization.