What were the investigations done for diagnosing ulnar contusion?
It is high time that you need to get the electrodiagnostic studies like EMG & NCV. Electromyograph is usually performed at around 4 weeks following nerve injury and it will give a fair idea about the denervation. Nerve conduction studies is particularly useful in determining secondary compression sites and type of injury to the nerve. If there is a persistent compression of the nerve, a surgery may be needed.
Please feel free for your follow up questions.
These investigations would show the exact status of the nerve.
After these investigations, if they don't diagnose, I would get an MRI of the elbow. I am also thinking of a whiplash which has caused problem and getting an MRI of the cervical spine would also be prudent as the next step.
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Best wishes and kindest regards.