Went skiing last weekend in Colorado, crashed, and my left collarbone went "pop". No bike-riding for me for a few weeks at least. See the full photo set here...
Hmm. Apparently I have an anterior dislocation of the sternoclavicular joint. More details at http://www.eorthopod.com/content/sternoclavicular-joint-problems.
And this is what I feel to the letter:
In rare cases, patients have a stable joint but a painful clicking, grating, or popping feeling. This indicates an injury to the intra-articular disc ligament. This type of injury causes pain and problems moving the SC joint.
Oh, fun! :(