I've finally found it, the real cause of Peter Forsberg's long-term ankle and foot problems.
The long-term effects of such acrobatics must be devastating on the joints. Not to mention on the ability to score goals on some random dude in front of a wooden net in the middle of Sweden.
ADDENDUM: Welcome to all the heroes sent here from Deadspin. May your pitchers be forever full and your bladders forever empty. Amen.