There was a statistically significant but small reduction in VAS pain score ( mean [ 95 % CI ] ) on `` movement '' ( 40mm [ 36 to 45 ] vs. 47mm [ 42 to 51 ] ; difference , -7 mm [ -13 to 0 ] ; P = 0.047 ) at 24h in the gabapentin ( n = 100 ) compared with control group ( n = 97 ) .