Author Time of Assessment Mean control (opioid) group VAS, cm (SD) Number of patients in group Mean regional (femoral block) group VAS, cm (SD) Number of patients in group Wang Recovery room 7.8 (1.6) 15 4.2 (2.9) 15 Wang POD 1§ 5.5 (2.1) 15 2.7 (2.6) 15 Chan - pre-op block group POD 1 3.9 (1.2) 20 1.9 (1.2) 20 Chan - post-op block group POD 1 3.8 (1.3) 21 1.6 (1.3) 21 Weighted Mean VAS Score: 4.7   2.0   §Postoperative Day #1

Table 4: VAS postoperative pain scores for knee arthroplasty.