Screw insertion into the base of the fourth metatarsal
A small Schanz screw is threaded into the base of the fourth metatarsal. The extensor tendons should be avoided and the two safe corridors are between the extensor tendons to the fourth and fifth toes, or between those to the third and fourth toes.
Overpenetration of the plantar cortex may endanger important plantar structures: Insert the screw carefully by hand (never with a power tool!).