Fracture of the proximal humerus occurs more frequently in older individuals who may have advancing osteoporosis, causing the bone to weaken, even with minimal force. And, most proximal humeral fractures respond satisfactory to conservative treatment. But, operative treatment is reconmended in the case that poor results are anticipated by the severe displacement and comminution. In older patient with proximal humerus fracture, there was some problem such as osteoporosis, absorption of cancellous bone, cystic formation, and weakness of the mechanical support, and it has difficulties in rigid fixation and early ROM. Four cases of displaced fracture of the proximal humerus in older patients over 50-year-old Treated by using plate & inlay fibular allograft from Apr. 1991 to Dec. 1993 were analized clinically and radiologically.