The absolute changes in the total score for joint function were significant for knees , ankles , and elbows in the RT group ( 9.2 1.38 , 5.1 0.5 , and 3.2 0.8 , respectively ) and the RTPEMF group ( 7.7 1.0 , 3.3 0.6 , and 2.5 0.7 , respectively ) compared to the PEMF and control groups .