The placebo group improved by the greatest magnitude for both outcome measures , but there was no statistically significant difference ( Mean difference ( 95 % CI ) , p-value ) between groups for change in pain ( 25.6 ( -0.7 to 51.9 ) , p = 0.056 ) or function ( 2.2 ( -1.6 to 6.0 ) , p = 0.237 ) .