Gamekeeper's thumb.
Mann
T S
TS
D000208:Acute Disease; D002908:Chronic Disease; D017885:Collateral Ligaments / Q000000981:diagnostic imaging / Q000293:injuries*; D004850:Eponyms; D006801:Humans; D008662:Metacarpophalangeal Joint; D011859:Radiography; D009626:Terminology as Topic; D013933:Thumb; D014457:Ulna