Capsules of the Distal Interphalangeal Joints, Anterior View

Description

Presented from the palmar (anterior) aspect, the hand and distal forearm are rendered with the distal interphalangeal (DIP) joint capsules emphasized at the fingertips, encircling the articulation between the middle phalanx head and the base of the distal phalanx in digits II through V. Each capsule sits distal to the proximal interphalangeal joint and distal to the insertion region of flexor digitorum superficialis, closely investing the terminal segment where flexor digitorum profundus courses to the distal phalanx and the extensor mechanism spans dorsally beyond the visible plane. The capsules appear as a thin membranous envelope, positioned centrally over the palmar aspect of the joint line and bounded on either side by the collateral ligament complex. Fingertip joint anatomy rewards an anterior view because palmar approaches, injections, and trauma patterns all reference what lies immediately volar to the DIP. A small structure, big consequences. Dorsal DIP osteophytes in osteoarthritis (Heberden nodes) and terminal extensor tendon disruption in mallet finger both alter joint congruence, and understanding where the capsule sits relative to the distal phalanx base helps explain why intra-articular fractures and capsular contracture can stiffen the joint and limit fine pinch. Hand anatomy faculty can drop this plate directly into an upper limb gross anatomy lab, a rheumatology teaching set on DIP arthropathy, or a hand surgery chapter discussing distal phalanx fractures, mallet injuries, and capsulotomy landmarks. It also reads well for patient-facing education when you need to clarify why pain and swelling localize at the terminal joint rather than the nail bed. Anatomical accuracy verified by SciePro's Medical Advisory Board.