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. 2012 Nov 27;11(2):137–145. doi: 10.2165/11591220-000000000-00000

Fig. 1.

Fig. 1

Puncture: longitudinal scan of the flexor tendons of the fourth finger using a high frequency (17 Mhz) linear probe over the metacarpophalangeal joint. The 25 G needle is clearly displayed (empty white arrow) with its tip at the tendon sheath distal to the A1 pulley (full white arrow). The X and bar on the right are markers of focus in the US display (X is the center, and the bar is the range of focus). FPT = flexor profundus tendon; FST = flexor superficialis tendon; MCH = metacarpal head; PP = proximal phalange.