This condition was first reported by a US (wisconsin) doctor sometime in the 1990s and it got characterized as a new sort of repetitive strain injury.

Pics of one such case here:

A successor to this condition was again reported recently (June 7 2007 paper in the New England Journal of Medicine).

What are the two conditions?

Cracked (in whole/part) by Goyal , username , Atul Mathew , Debasish , Rahulk , Vinayak Sapru , Vaishnavi , Ananth , aditya_s , Dibyo , Siddharth Jain , vinayprasad and Prasad.

Goyal, username, Atul Mathew, Debasish, Rahulk, Vinayak Sapru, Vaishnavi, Ananth, aditya_s, Dibyo, Siddharth Jain, vinayprasad and Prasad