Personal: I have shoulder bone loss and experience moderate discomfort when slowly extending my arm above shoulder height and severe acute pain with average speed or when having to stretch in any direction to reach an object. My doctor gave me two options. To live within my physical limitations or surgery. The pain eventually reached the point where even Codman's pendulum exercise became undoable. That was 30 years ago. I was in my early forties and living in constant fear of normal arm… Show more Personal: I have shoulder bone loss and experience moderate discomfort when slowly extending my arm above shoulder height and severe acute pain with average speed or when having to stretch in any direction to reach an object. My doctor gave me two options. To live within my physical limitations or surgery. The pain eventually reached the point where even Codman's pendulum exercise became undoable. That was 30 years ago. I was in my early forties and living in constant fear of normal arm movements. I'm now 74, with no pain, no restrictions, a full range of motion, and healthy (no surgery). This prototype offers the change in approach necessary to achieve pain-free movement. Show less