 Next using the normal AO manner, the distal cortex was drilled from dorsal to plantar with a 2.0 mm drill bit and then over drilled proximally with the cortex using a 2.7 mm drill bit. 
Next using the normal AO manner , the distal cortex was drilled from dorsal to plantar with a 2.0 mm drill bit and then over drilled proximally with the cortex using a 2.7 mm drill bit .