Trigger finger. It sounds like he has a "trigger finger". I have it myself and my orthopedist gave me some finger splints. See this article from mayo clinic: http://www. Mayoclinic. Com/health/trigger-finger/ds00155 a more detailed site with graphic videos is found here: http://www. Handandwristinstitute. Com/trigger-finger-surgery-los-angeles/? Gclid=ci2tjekdl7acfuq0qgoderwi4a. Hope that helps.