Whats the difference between a sprain elbow and ulnar nerve neuritis? i got 2 different diagnosis from 2 doctors

Suggestions: Not sure what is meant by elbow "strain", but here are some guidelines: if ulnar nerve trapped at elbow, will have numbness and tingling over digits 4 and 5 in hand, with weakness in spreading fingers apart (EMG test can confirm). Localized elbow problems include bursitis, epicondylitis (medial or lateral), "tennis" elbow, and would cause local pain, swelling, stiffness.