23 yo male presents with hand pain.  He reluctantly admits to punching a wall during a fight with his girlfriend.  Exam reveals focal swelling and tenderness of right hand.  What's the diagnosis?  (scroll down for answer)

Answer: Boxer's Fracture 

A 53 yo female presents with acute onset of sharp abdominal pain 

A 23 year old male with a history of IVDU presented with pleuritic chest pain.

A 40 year old female presents with right knee pain after she was struck by a truck’s tailgate.  She is unable to bear weight and rests her knee on the stretcher in extension.