baseball finger

[bāsbôl′]
n.
  1. Permanent flexion of the terminal phalanx of a finger due to a break in the extensor tendon resulting from a blow from a ball or other object.hammer finger mallet finger
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.