Seems like we're operating permanently at the limit of what our elbows can handle and any slight change is enough to push them over the edge into actually hurting. In my case recently it was mucking about in the park practicing crevasse rescue & hauling with some mates who were heading off for a glacier ski tour. Made the mistake off locking off to fiddle about with something instead of hanging on a prusik - sore elbow for weeks afterwards.My elbow problems so far have always been golfers/brachioradialis, and stretches and hammer curls seem to keep them reasonably under control.
Cheers for the replies. Here's a pic. 20150513_110658 by Nibile, on FlickrThe single point is the original injury, the fall on the mat with what I described as "layers sliding one on the other/separating". It was painful just in the spot, but very painful. The double point is more or less the current injury. It's painful at some degrees of flexion, while extending the arm. It seems more related to the intersection of the tricep.