About ten years ago, I had allograft surgery
replacing four ligaments in my knee
with allografft. about six months later, after
a lot of pain and swelling, and being told by residents that the pain was normal-they saw the hardware was backing out on its own, the screws were protruding about a half-inch from where they were originally placed, flush with t he bone. They srgically tried to remove the hardware, got five or so out, then abandoned the rest because two broke off upon removal attempts.