The most common injury is the supraspinatus tendon, accounting for 66/114 (57.9%) cases, in which the rate of the group 50 years old and over is 45/63 (71.4%) higher than the group under 50 years old, 21/51 (41.2%), (p < 0.01, OR = 3.6; 95% CI: 1.6 - 7.8).