RESULTS	Similarly , we detected no differences between the 2 treatments with respect to the secondary end points , with one exception : subjects with a femoral catheter ambulated a median ( 10th-90th percentiles ) 2 ( 0-17 ) m the morning after surgery , in comparison with 11 ( 0-31 ) m for subjects with a posterior lumbar plexus catheter ( data nonparametric ; P = 0.02 ) .\