This paper analyses 80 cases of displaced proximal humerus fractures, with two or three fragments, treated by PHN nailing. The hold of the spiral blade was effective, and is particularly recommended for fractures with two fragments according to Neer's classification. The results, analysed with Constant's score and radiographic checkups, were satisfactory. Nearly all our patients (76 out of 80) had a mean age of 75 years and a total Constant score of 78.48. Only four (mean age 42.5 years) had a Constant score of 86. Shoulder articulation was good and only a few complications occurred.