Comparative Pain Control Between 0.2 or 0.3 Spinal Morphine and 0.25 or 0.5 % Bupivacaine for FNB After TKA

Comparative Effect of 0.2 or 0.3 Spinal Morphine and 0.25 or 0.5 % Bupivacaine for Femoral Nerve Block After Total Knee Replacement

Comparative efficacy of 24 and 48 hours post operative pain control in single total knee replacement between intrathecal bupivacaine with 0.2 or 0.3 mg morphine together with 0.25 or 0.5 % bupivacaine for single femoral nerve block

Inclusion Criteria:

• Single elective total knee replacement in ASA 1-3 without significant cardiovascular limitation

Exclusion Criteria:

• patient at risk in usage COX-2 for post operative pain control