Doctor suggested cortisone injection and on July 13 I had a shot in my shoulder. The pain lessened. I had been doing physiotherapy for 9 weeks before and after the shot. However I was at work and had to hop up over a small counter top. My life has been a severe painful nightmare since then. The pain I've been experiencing since that day is unbearable. I was not told that cortisone weakens the tendons in and around the area of the injection. The doctor gives me strong pain killers but they have side effects that I'm looking forward to.
An O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.
Just to reiterate some of what's already been said, the only difference between an O ring chain and an X ring chain is the shape of the sealing ring. O rings are just like any O ring you've ever seen--a cross sectional shape that is circular. An X ring has a cross section that looks like an X. The X provides two sealing surfaces instead of one. X ring chains typically seal as good or better than O rings and create less friction as they articulate. There are also T rings and Z rings.