I fell on my ass back during one of the big snow storms in Feb, trying to knock snow off a tree before it broke off. Not too unusual, except I cracked my elbow hard on the blacktop driveway, and ever since have had issues in the 'bow. When I rub it right on the elbow tip, there are loose floating bodies that I can move around, though they seem connected by a gel or some fibers. I can't really prop myself up on my elbow without significant pain, though if I were left handed and had a decent shoulder, I could probably throw okay.
Just saying, I think I know what floating bodies are.