Wrist 24

JERSEY FINGER

Rupture of Flexor Digitorum Profundus due to forced extension of flexed finger Classic in rugby, as a player pulls away from the injured player who is trying to grip his/her jersey Can occur in all fingers but these injuries are most common in the ring finger which is affected in 3/4 of cases

This may be due to tethering by the lumbrical muscles or that this finger shares a muscle belly with the middle and little fingers

IMAGING

If bony avulsion present, position of tendon end can be seen on xray On the flexor side, there are 5 zones, also numbered from distal to proximal Leddy-Packer classification Type I: tendon retracts into palm

Type II: tendon retracts to PIP joint Type III: tendon entrapped at A4 pulley