IPACK block involves ultrasound-guided local anesthetic infiltration of the space between the popliteal artery and the posterior knee joint capsule.

The IPACK block involves infiltration of the space between the popliteal artery and the posterior knee joint capsule with 20 ml of 0.25% local anesthetic (bupivacain) under ultrasound guidance.

The Numeric Rating Scale (NRS) is a frequently used tool for assessing and monitoring the severity of pain. The pain scale measures on an 11-point rating system, where 0 indicates the absence of pain and 10 represents the most severe pain one can imagine. Patients are requested to assess their pain on a scale ranging from 0 to 10. The physician obtained from measurements at each visit by directly questioning the patient.

The Western Ontario and McMaster Universities Arthritis Index (WOMAC) is widely used in the evaluation of knee osteoarthritis. It is a self-administered questionnaire consisting of 24 items divided into 3 subscales: pain, stiffness, and physical function. The questionnaire evaluates activities of daily living and functional mobility. The test questions are scored on a scale of 0-4, which correspond to: None (0), Mild (1), Moderate (2), Severe (3), and Extreme (4). The scores for each subscale are summed up, with a possible score range of 0-20 for pain, 0-8 for stiffness, and 0-68 for physical function. Higher scores on the WOMAC indicate worse pain, stiffness, and functional limitations.

The assessment of quality of life was conducted using the SF-12, a questionnaire specifically designed to measure health-related quality of life. The SF-12 consists of twelve items that evaluate eight different health domains, providing an evaluation of both physical and mental well-being. The SF-12 provides two summary scores: the mental component score (MCS-12) and the physical component score (PCS-12). A decrease in the questionnaire score indicates progression of disability. The questionnaire's validity and reliability were ensured, and the Turkish version of the questionnaire was filled out by the patients.