This could be a case of brachial plexus
injury/ulnar nerve injury
. In minor cases, if the nerve injury is minimal, it will get better on its own. Is your husband able to move his arms , hands and fingers the same as he was able to do earlier? Any history of weakness of the forearms, hands etc? Any history of sudden onset of sharp shooting pain in the forearms and hands. If the above symptoms are present , I would suggest that you visit a neurologist
, who might advise you to get nerve conduction studies or EMG done.
I hope your husband feels better soon. Have a nice day :)