Simovitch RW, et al. - In this retrospective, multicenter database cohort study, authors analyzed 55 cases of age 65 years and older at Level I and Level II trauma centers to assess the tuberosity union rate and clinical results after 3- and 4-part proximal humerus fractures. They found 83% of the greater tuberosities united (that were repaired). Greater tuberosity union produced greater active external rotation (ER). They observed a significant difference in the capability to do ER-type activities between the 2 cohorts indicated in their ability to position one's hand behind their head with the elbow forward and comb their hair.