Tuberosity Of The Distal Phalanx, Posterior View

Description

Distal phalanx anatomy is centered on the ungual (nail) tuberosity at the distal end of the terminal phalanx. From a posterior (dorsal) perspective, the tuberosity appears as a roughened, curved bony surface that lies distal to the slender shaft and proximal to the apical tuft, with its margins aligning with the medial and lateral borders of the nail bed. Proximally, the base of the distal phalanx and the dorsal aspect of the distal interphalangeal (DIP) joint region sit superior to the tuberosity, establishing the dorsal contour that underlies the nail plate. Nail bed injuries are bony injuries, too. The dorsal surface of the distal phalanx is the osseous foundation for the sterile matrix, so crush trauma that produces a subungual hematoma or nail plate avulsion often accompanies a tuft fracture or a dorsal cortical irregularity at the ungual tuberosity, and open fractures through this region carry a real risk of contamination and osteomyelitis. Hand surgeons and emergency clinicians also track this dorsal topography when assessing Seymour-type injuries in children (physeal fracture with nail bed interposition) or when planning nail bed repair, because restoring the nail plate contour depends on reestablishing the underlying bony support. Surface texture matters here. Use this illustration in upper limb osteology teaching, hand surgery and emergency medicine references on fingertip trauma, and medical publishing that needs a precise posterior-view landmark for the distal phalanx, nail bed interface, and terminal tuft fracture discussion. Anatomical accuracy verified by SciePro's Medical Advisory Board.