ASR 9:10am Apr 24 2012
My OS (a foot and ankle reconstruction specialist) and my PT both said NEVER do this. It places too much stress on structures in the foot, plus it can strain the Achilles if you put more pressure on it than its ready for.
Its better to use a 2X4 board, so your heels have a limited drop and then are supported so your mid foot isn't overstressed. A wedge board is the other safe way to work on dorsiflexion. See my Picasa web album for a simple adjustable wedgeboard design my Dad made for me. It got enthusiastic approval from my PT. You start with a low angle, stand for 30 seconds, then off for 30, repeat. When that gets comfortable, add a slight knee bend, keeping heels on the board. When that gets comfortable, increase the angle and start over.
Fully recovered from Pilon tib/fib
2 Plates, 10 screws, 2 HWR's,
1 Plate & 3 Screws left