If you've ever even tried to learn a trick on a BMX, you'll know the hazards of those weird platform yokes where your feet go...
The pedals! That's what they're called. Anyway, your best bet to prevent turning your shins in to mince is a good set of shinpads.
Take a look at one of Fuse's offerings - 

Main Pad Material: breathable perforated neoprene with air plush lining
Protection Material: eva foam back under full length polyamide shield
Main Pad Material: breathable perforated neoprene with air plush lining
Protection Material: eva foam back under full length polyamide shieldMain Pad Material: breathable perforated neoprene with air plush lining
Protection Material: eva foam back under full length polyamide shield