A Variation in the Insertion of Flexor Digitorum Superficialis Tendon

Abstract

Flexor Digitorum Superficialis (FDS), also called as Sublimis Flexor Digitorum, is one of the largest superficial flexor muscles present in the anterior compartment of the forearm. It may also be referred to as the intermediate layer of flexor muscle. This fusiform muscle is long, broad and splits into four tendons. During routine PG cadaveric dissection in the dissection hall of the Rachana Sharira Department, a bilateral variation in the insertion of the Flexor Digitorum Superficialis tendon to the little finger was discovered. Understanding the variations of this tendon is essential because, in conditions like Swan Neck Deformity, tenodesis of one of the FDS slips is performed using the procedure called FDS Tenodesis or Superficialis Sling. In individuals suffering from advanced chronic Carpal Tunnel Syndrome (CTS), the FDS is transferred to the abductor pollicis brevis to restore thumb abduction. Surgeons will find this knowledge beneficial as they have to carefully plan the procedure.