Summary Flexor tendon entrapment in fractures of the proximal phalanx is a rare occurrence. This complication has only been reported in association with displaced epiphyseal and diaphyseal fractures. Here we describe a case of an unusual proximal phalangeal fracture pattern with functional hindrance of the flexor mechanism. A 34-year-old man presented with an absent flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) function of the ring finger 4 weeks after an injury. X-Ray Examination revealed a bony fragment on the radial volar aspect of the proximal phalanx. USS revealed an intact FDS and FDP tendons. Excision of the bony fragment with tenolysis led to restoration of function.