If not supported adequately, it invariably causes varus collapse of your fracture or screw penetration through the humeral head. A properly-positioned calcar screw, fibular strut graft or a small medial plate can avoid this complication. Bone density decreases after a while, leading to thinner bones that are much more vulnerable https://www.theorthopaedicandpainpractice.com/what-is-a-proximal-humeral-fracture/