Pain management after knee replacement surgery - comparison between nerve blocks

INTERVENTION: Intervention1: Combined adductor canal and popliteal plexus blocks: Ultrasound guided combined adductor canal and popliteal plexus blocks will be given at the end of surgery Intervention2: Dual subsartorial block: Ultrasound guided dual subsartorial block will be given at the end of surgery Control Intervention1: Adductor canal block: Ultrasound guided adductor canal block will be given at the end of surgery CONDITION: Health Condition 1: O‐ Medical and Surgical PRIMARY OUTCOME: Visual Analog Scale score for painTimepoint: 4 hours after surgery ; 8 hours after surgery ; 12 hours after surgery ; 24 hours after surgery ; 36 hours after surgery ; 48 hours after surgery SECONDARY OUTCOME: Location of knee painTimepoint: 24 hours after surgery Patient satisfactionTimepoint: 24 hours after surgery Quadriceps muscle powerTimepoint: 24 hours ; 48 hours Time to receive first rescue analgesiaTimepoint: Within 24 hours after surgery INCLUSION CRITERIA: ASA PS ‐I, II Primary unilateral TKA via medial parapatellar approach by a single surgeon done under spinal anaesthesia