Body Of The Proximal Phalanx, Posterior View

Description

Proximal phalanx body (shaft) of a finger occupies the center of the frame in posterior (dorsal) view, positioned between the expanded proximal base and the distal head that articulate with the metacarpal and middle phalanx, respectively. Along this dorsal aspect, the cortical surface appears gently convex longitudinally, with subtle mediolateral flattening that hints at the shaft’s three-sided geometry even without a palmar view. The lateral and medial margins define the transition toward the phalangeal sides, where collateral ligament attachments lie more proximally and distally at the neighboring joints. No soft tissues obscure the bony contour. Dorsal shaft morphology matters when you are localizing fractures and planning fixation, because proximal phalanx fractures often angulate apex volarly under intrinsic muscle pull, and the dorsal cortex becomes the reference surface for judging alignment on lateral radiographs and intraoperative fluoroscopy. Extensor mechanism problems also live close to this surface, with the central slip inserting at the base of the middle phalanx and the extensor hood spanning the proximal phalanx, so dorsal prominence, callus, or hardware can translate into tendon irritation and loss of PIP extension. The fixed posterior perspective makes it easy to appreciate the smooth dorsal arc between MCP and PIP levels, a contour that should remain uninterrupted in an anatomic reduction. Hand anatomy courses, orthopedic teaching files on phalangeal fractures, and surgical atlases describing dorsal approaches for percutaneous pinning or plate placement will all benefit from this illustration as a focused reference for the proximal phalanx shaft. It also fits well in radiology primers that correlate dorsal cortical contour with malrotation and angulation patterns in the fingers. Anatomical accuracy verified by SciePro's Medical Advisory Board.