Strength of elbow flexion ≥ 36 months (n=74) 10 frequency Percentage (%) M0 1 1, 4 M1 - 2 7 9, 5 M3 18 24, 3 M4 48 64, 9 Tổng 74 100, 0 36 months after surgery, elbow flexion achieved M3 or better was 89, 2%.