Fig. 1.

A. A2 and C1 pulleys were removed, and bowstring effect occurred. B. Flexor digitorum superficialis (FDS) insertions were cut proximally to the A3 pulley. C. A tendon vinculum was removed, thus FDS was elevated, and ulnar and radial insertions of FDS were further separated through a cut, from distal to proximal. D. A Ulnar and radial insertions are inverted crossing over the flexor digitorum profundus (FDP), then they were pulled in divergent directions, to fix the FDS in the right position on the pulley rims. E. Ulnar and radial insertions crossed again over the flexor FDP, then they were fixed on the pulley rims on the opposite side. The end result was a four anchor-points transposition. In this photo, a blue background was positioned to highlight the virtual space between FDS and FDP. F. finger flexes without bowstring effect.