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Objectives: Determine the analgesic effect of a single injection femoral nerve block on postoperative pain and ambulation, after total knee arthroplasty. Methods: In a prospective study, 84 patients undergoing total knee arthroplasty were randomly assigned to receive: either one single injection femoral nerve block and 100mg paracetamol combined with lornoxicam 4 mg administrated twice intravenously for 5 days (group 1, n=42) or only the aforementioned analgesics without nerve block for the same period (group 2, n=42). Distance walked on 5 first postoperative days and VAS pain score during first 5 days were reported. Patients with bilateral osteoarthritis, previous leg injury or serious cardiovascular disease were excluded. Statistical analysis was performed by statistical packet STATA 8.0 and significance was set at p-value <0.05. Results: Patients of group 1 walked longer distance than patients of group 2 on postoperative day 1, 2 and 3 (p<0.05).The VAS pain score decreased significantly from 7.8/10 to 4.1./10 in Group 1 (P<0.05) and from average 8.1/10 to 5.9/10 in Group 2 (p<0.05) at 5 days after surgery. Patients of group 1 experienced less pain than patients of group2 at 5 days after surgery according to VAS pain score (p<0.05). Conclusion: Single shot of femoral nerve block provides efficient pain relief on early postoperative period after total knee arthroplasty. This is associated with better ambulatory performance.

Analgesic Effect of Femoral Nerve Block on Postoperative Pain and Ambulation after Total Knee Arthroplasty