Analyses showed neither needle nor laser acupuncture significantly improved pain ( mean difference ; -0.4 units ; 95 % CI , -1.2 to 0.4 , and -0.1 ; 95 % CI , -0.9 to 0.7 , respectively ) or function ( -1.7 ; 95 % CI , -6.1 to 2.6 , and 0.5 ; 95 % CI , -3.4 to 4.4 , respectively ) compared with sham at 12 weeks .