I think it's called costochondritis. Check out this link I found yesterday for more information and many other with this same condition:
sensored://ehealthforum.com/health/topic4094.html

Posted By Kim on August 26, 2005 at 11:23:28:

In Reply to: Sternum Cracking posted by Cassandra Fowler on April 28, 2005 at 17:33:09:

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Helps strengthen the kneecap mechanism by applying pressure on the tendon above the kneecap as well. This tends to reduce the forces of the quadriceps on the patella tendon and erosion of the under surface of the kneecap due to a possible misalignment of the quadriceps (Q-angle).

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