When you say "crook" of elbow are you referring to interior or exterior of the elbow or is the pain right in the middle where your arm bends? Pain on the inside (part closest to the middle line of your body) is "golfer's elbow" and pain on the outside aspect of your elbow is "tennis elbow". Both are forms of tendonitus affecting different areas on the elbow joint and both, but Golfer's elbow more so, can get debiliatating eventually if left unchecked. These are the the more common problems with the elbow joint, but they don't usually occur from a sudden, traumatic injury like it sounds like you sustained, but from continual overuse or misuse of the elbow joint. If the pain really is the middle of the elbow (top side), it could simply be a muscle pull relative to the lower biceps or from the forearm. The elbow is a messy joint with some tight crevices for tendons and ligaments to run through and is prone to give everybody who lifts problems from time to time. Good luck with your ailment whatever it ends up being. Ice it and get to a Dr. if it doesn't heal up in 3 or 4 days I would suggest.