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1Principles

Tiny fracture fragment. This is usually not easy to see in an x-ray, but may be palpated.

Type II
Tiny fracture fragment. This is usually not easy to see in an x-ray, but may be palpated.

The tendon is retracted to the PIP joint and is prevented from retracting further by the bony fragment catching in the bifurcation of the superficialis tendon (as shown in the drawing). The long vincular artery remains intact.