Hello, ulnar nerve subluxation is quite common but most of the patients do not require much treatment. Settles down on is on. Even if it persists, it does not lead to complications. Only people who have complications like severe disabling pain, weakness in fingers or loss of sensations are advised to undergo an NCV. By Range of motion in your arm, if you mean elbow? If yes, then are you involved in any overhead athletics or sports? If yes, then you might have to have a formal appointment with a sports injuries specialist or a shoulder and elbow specialist to get yourself examined.
Next Steps
Avoid sporting activitiesfor a few days and see if it settles down. If not, then please get yourself examined. Take painkillers and anti- inflammatory drugs if necessary, in the mean time