Capsules of the Proximal Interphalangeal Joints as, Anterior View

Description

Running across digits two through five, the proximal interphalangeal (PIP) joint capsules form a fibrous envelope around the head of each proximal phalanx and the base of the middle phalanx, spanning the palmar and dorsal joint margins. From the anterior (palmar) perspective, the volar aspect of each capsule blends with the volar plate, while the collateral ligaments sit at the medial and lateral edges of the joint line, flanking the flexor tendon sheath. Distally, the capsule attaches near the palmar rim of the middle phalanx, and proximally it anchors around the condylar region of the proximal phalanx. Small joints, tight constraints. Palmar viewing matters at the PIP because the volar plate and capsular thickening are the structures that fail first in common hyperextension injuries, producing a dorsal PIP dislocation pattern and the familiar volar plate avulsion fragment at the base of the middle phalanx. Hand surgeons also think in this plane when planning exposure for PIP contracture release, where adhesions between the flexor sheath, capsule, and volar plate can limit extension, and where the digital neurovascular bundles run just lateral to the operative field. Joint stability here is not abstract, it is mechanical and local. Use this artwork for hand anatomy modules in gross anatomy and orthopaedic teaching, for board style figures explaining PIP dislocation and volar plate injury, and for operative education materials covering palmar approaches to the finger with attention to collateral ligament preservation and flexor tendon mechanics. It also fits well in rehabilitation and splinting guides that need a clear capsular reference when describing extension block protocols. Anatomical accuracy verified by SciePro's Medical Advisory Board.