Ability of weights lift of M4 elbow flexion group times n ± SD (kg) Min Max 36 months post operation 48 3, 0 ± 0, 8 1, 6 5 36 months post operation 39 3, 3 ± 0, 7 2, 2 5 There was no statistically significant difference between two group with p > 0, 05.