Choosing nail diameter
A radiographic gauge, as illustrated, helps assess the medullary canal diameter. Check both AP & lateral views.
The nail diameter should be large enough to provide sufficient strength and durability of both nail and locking screws. Consult the nail manufacturer’s instructions. Usually a 10 mm nail is sufficient. Reaming should be to 0.5 to 1.5mm greater than nail diameter, since the medullary canal is not perfectly straight.