Drill a 2.5 mm hole, with the protection of a drill sleeve, 2-3 cm above the level of the horizontal joint line, aiming the drill bit slightly inferiorly to avoid screw pullout.
Tap the medial cortex with the 3.5 mm tap and protection sleeve.
Insert a unicortical screw, ranging from 20-30 mm in length and fitted with a washer. Leave a space for the wire of 2-3 mm between the bone and the washer.
In osteoporotic bone, this screw must be bicortical.