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Long oblique head fracture of the proximal phalanx – Lag screw fixation

Countersinking in diaphyseal bone

There are two important reasons for countersinking:

  1. The risk of soft-tissue irritation is greatly reduced by ensuring that the the screw head protrudes only minimally from the bone surface.
  2. Countersinking ensures that the screw head has a maximal contact area with the bone, distributing the forces from the screw head more widely and more biodynamically than an unsunk head.