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Drilling

T-shapred fracture of the proximal phalanx PIP joint – Lag screw fixation

Drilling

Hold the condyle in the reduced position with a dental pick. Some surgeons use pressure from the drill guide to hold the reduction during drilling.
Drill a gliding hole as perpendicularly to the fracture plane as possible at the site of this ridge, using a 1.0 mm drill bit for a 1.0 mm screw.
Use a 0.8 mm drill bit to drill a thread hole in the opposite fragment, just through the far (trans) cortex.
With very small fragments, it may be advisable to drill with manual rotation of the bit, rather than a powered driver.

Pearl: use drill bit for temporary fixation
Leave the drill bit in the drill hole to preliminarily hold the fragment in place.