[Swan-neck deformity].

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Abstract

[Indexed for MEDLINE] 9. Phalanx Fracture (Archived). Kee C(1), Massey P(2). In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan–. 2023 Aug 14. Author information: (1)Ochsner LSU Shreveport (2)LSU Health Phalangeal fractures of the hand are a common injury that presents to the emergency department and clinic. Injuries can occur at the proximal, middle, or distal phalanx. For the vast majority of phalanx fractures, an acceptable reduction is manageable with non-operative treatment. Early intervention is vital to allow healing and return of function. Anatomy The proximal and middle phalanges of the hand all possess a head, neck, shaft, and base. The distal phalanx divides into the tuft, shaft, and base. The proximal phalanx receives stabilization from the surrounding anatomy, including proper and accessory collateral ligaments, volar plate, and extensor/flexor tendons. The middle phalanx has two main insertions: the central slip (extensor mechanism) and the flexor digitorum superficialis (FDS). The distal phalanx anatomy includes the distal interphalangeal joint (DIPJ), which is enveloped by the extensor and flexor tendons along with the volar plate and collateral ligaments. The flexor digitorum profundus (FDP) inserts at the volar metaphysis of the distal phalanx. At the proximal interphalangeal joint (PIPJ), the flexor digitorum profundus and the flexor digitorum superficialis are within one sheath. The flexor digitorum superficialis is volar, and the flexor digitorum profundus is dorsal. As the tendons transverse the PIPJ the flexor digitorum superficialis bifurcates into two slips that form the Camper's chiasm which inserts on the volar aspect of the middle phalanx. This important anatomic relationship can lead to a swan neck deformity (a hyperextended PIPJ and flexed DIPJ). Copyright © 2026, StatPearls Publishing LLC.