240 Flexor Digitorum Profundus Tendon Segment Length Estimation via Measurement of Adjacent Landmarks in the Secondary Repair of Jersey Finger

Abstract Aim Jersey finger describes injury involving the rupture of a Flexor Digitorum Profundus (FDP) tendon. The occurs at its point insertion, base distal phalanx. Cause is forced hyperextension FDP. Correct tendon tensioning correlates with length during repair and vital to optimise restoration function. No evidence-based approach exists hitherto. We used cadaveric dissection measure anatomical landmarks associated FDP assess whether these can be estimate adjacent segments. Method Eight hands were dissected (four fresh-frozen four formalin-fixed). Lumbrical muscles, A1 pulley insertion for digits II-IV identified. Lengths between most lumbrical origin; proximal ends recorded. Results Measurements showed great degree variation no clear trend across studied. Conversely, origin lengths consistent relative digit measurements all cadavers II, II IV. This was confirmed by linear regression analysis (R2 >0.97). Conclusions study demonstrates how in III graft required or IV, repair. manifests commonly Therefore, our finding furthers surgical knowledge likely improve patient outcomes.