With the intense type of downhill MTB that you do, it sounds like there is a good chance that you really did fracture your sitbone.

3-6 foot drops! I'm still impressed.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle