Abstract
Background
We compared pain relief after total hip arthroplasty using periarticular intraoperative injection along with single dose post operative injection of local anesthetic (THA) with the well-established practice of epidural infusion.
Methods
70 patients undergoing elective THA under combined spinal anaesthesia were randomly assigned to receive either (1) continuous epidural infusion (group B) or (2) infiltration around the hip joint with a mixture of 100 ml of bupivacaine (2 mg/ml) + 1ml ketorolac (30mg/ml) and 0.5ml epinephrine (1mg/ml) at the conclusion of surgery combined with one postoperative intraarticular injection of 20 ml. of Bupivacaine 0.5% + 1ml ketorolac (30mg/ml)+ 0.5 ml. epinephrine (1mg/ml) through an intraarticular catheter (group A).
All patients received acetoaminophen 1gm 8 hourly for 72 hrs and injection ketoralac 30mg every 6 hourly IV(15mg if >65 yr 30mg if <65 yr). Breakthrough pain in any group (VAS >7) was treated by injection fentanyl 20 μg bolus at 10 min. interval till VAS reduced to < 4. If VAS 4–7 injection tramadol 50mg IV was given if VAS continued to be >4 after 15 min. then injection fentanyl 20 μg bolus was given at 10 min interval till VAS <4.
Results
Narcotic consumption was significantly reduced in group A compared to group B (p=0.007). Pain levels at rest and during mobilization were similar in both groups during first 24 hrs but significantly reduced in group A after cessation of treatment.
Interpretation
Wound infiltration combined with intraarticular injection of local Anaesthetics provides good pain relief for patients undergoing THA.
