(Click the link to comment and to vote – voting not working through email, sorry!)

You are seeing a 17 year old boy who fell while skateboarding and sustained an axial loading force to his right thumb. He is exquisitely tender at the base of the thumb (carpometacarpal joint), and you note swelling as well. Which of the following injuries is least likely to be encountered based on this mechanism and exam?

Which of the following injuries is least likely to be encountered in this patient?