In both groups , mechanical pain threshold was decreased 18-24 h postoperatively ( 2.93 0.209 Ln ( g ) vs. 3.454 2.072 Ln ( g ) , p = 0.032 in RD group ; 2.910 0.196 Ln ( g ) vs. 3.621 0.198 Ln ( g ) , p = 0.006 in HD group , 18-24 h postoperatively vs baseline ) .