"stage 1: proximal stump near the bony insertion"
"stage 2: proximal stump is at the level of the humeral head"
"stage 3: proximal stump at the level of glenoid or more proximal"
"stage 1: proximal stump near the bony insertion"
"stage 2: proximal stump is at the level of the humeral head"
"stage 3: proximal stump at the level of glenoid or more proximal"