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This study was conducted to obtain data concerning suture failure by identifying the change in bone mineral density in the proximal humerus relative to age and gender. Bone mineral density of the greater tuberosity, humeral head, and surgical neck of the proximal humerus was measured in 175 individuals (74 men and 101 women) aged >40 years. Compared to individuals in their 40s, the bone mineral density of the greater tuberosity of the humerus for women in their 70s showed a 42% decrease and in men a 43% decrease. It is therefore recommended that cadavers used for subsequent research on the fixation strength of suture anchors undergo bone mineral density analysis.