Trauma:
If you are excessively gripping like in golf or tennis with impact, the elbow could be injured from repetitive stress.  The junction where the tendon and muscles join at the elbow is not that strong and if you have repetitive trauma that part will start to strain overtime. Also, if you happen to fall on your hand or wrist, the elbow will absorb most of the force. Depending on how hard the impact, you can cause injury to the elbow. 

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