Proximal Humerus Bone Loss in the Setting of Reverse Total Shoulder Arthroplasty.

» Proximal humerus bone loss (PHBL) is a challenging issue in the setting of reverse total shoulder arthroplasty, particularly during revision surgeries. » PHBL can compromise the deltoid moment arm, soft tissue attachments, and stability of the humeral and glenoid components. » Causes of PHBL are multifactorial, and the degree of bone loss can vary widely among patients. » Treatment options include long-stem reconstruction prostheses, cementoplasty, reverse total shoulder allograft prosthesis composite reconstruction, proximal humerus replacement/endoprosthesis, and custom 3D-printed reconstruction. » Each treatment option has unique advantages and limitations, emphasizing the importance of individualized management plans tailored to patient needs.