 This trial recruited 76 randomly assigned patients, 37 in the intervention group and 39 in the control group. The overall post-surgery pain scores, as analysed by two-way ANOVA, were significantly lower in the intervention group P0.0019. On Bonferroni post-tests both 12 hour P0.01 and 24-hour P0.01 pain scores were significantly lower in the intervention group. 