RESULTS	The mean ( SD ) pain scores for subjects receiving a femoral infusion ( n = 25 ) were 3.6 ( 1.8 ) versus 3.5 ( 1.8 ) for patients receiving a posterior lumbar plexus infusion ( n = 22 ) , resulting in a group difference of 0.1 ( 95 % confidence interval -0.9 to 1.2 ; P = 0.78 ) .\