A 22 year old man came to the hosp after an injury in his hand while playing basketball. Examination: avulsion of extensor tendon from the distal phalanx. What is the single most probable deformity?

The key is C. Mallet finger. [A finger that bends down at the end joint and cannot be straightened is called a mallet finger. It is caused by an injury to the extensor tendon that straightens (extends) the finger. A splint worn day and night for 6-8 weeks will cure the problem in most cases].