This study aims to compare the analgesic efficacy and functional outcomes of blocking the nerve to the vastus lateralis (NVL) muscle versus the lateral femoral cutaneous nerve (LFCN).
Age ≥ 18 years.
Both sexes.
American Society of Anesthesiologists (ASA) physical status from I to III.
Underwent knee surgeries under spinal anesthesia.
Pregnancy.
Coagulopathy.
Neuromuscular disorders.
Hematological disorders.
Parallel
Vastus lateralis nerve block
DrugPatients received vastus lateralis nerve block with 5 ml of bupivacaine 0.5%.
Lateral femoral cutaneous nerve block
DrugPatients received lateral femoral cutaneous nerve block with 5 ml of bupivacaine 0.5%.
Degree of pain
Each patient will be instructed about postoperative pain assessment using the numeric rating scale (NRS) score (0 represents "no pain" while 10 represents "the worst pain imaginable"). NRS assessments will be conducted at the post-anesthesia care unit (PACU) and at 2, 4, 6, 12, 18, and 24 hours postoperatively.
Time to first request for analgesia
The time to first request for analgesia will be recorded from the end of surgery till the first dose of morphine is administered.
Total morphine consumption
If the numeric rating scale (NRS) exceeded 3, rescue analgesia in the form of a 3 mg morphine bolus will be administered, to be repeated after 30 minutes if the pain persisted until the NRS dropped below 4.
Block performance time
The block performance time will be recorded from the placement of the ultrasound probe to the removal of the needle after the injection of local anaesthetic.
Degree of patient satisfaction
The degree of patient satisfaction will be measured using a 5-point Likert scale (1 = extremely dissatisfied, 2 = unsatisfied, 3 = neutral, 4 = satisfied, 5 = extremely satisfied).
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