Workup
Laboratory and Imaging Studies
Laboratory studies
Laboratory studies are not indicated for the diagnosis of PIP joint injuries.
Imaging studies
Obtain anteroposterior, lateral, and oblique radiographs of the injured digit. Radiographic interpretation includes assessing the PIP joint for dislocation, subluxation, and fractures.
Media Gallery
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Anatomy of the proximal interphalangeal joint. The central slip passes directly over the joint and inserts on the base of the middle phalanx. The lateral bands pass around the joint, combine with the retinacular ligaments, and unite to form the extensor tendon that attaches on the distal phalanx. Lateral motion is minimized by the collateral ligaments, and extension is limited to 0º by the thick volar plate.
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Volar plate disruption with a stable, nondisplaced avulsion fracture of the middle phalanx.
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Dorsal dislocation of the proximal interphalangeal joint.
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Typical boutonniere deformity.
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Extension block splint with the proximal interphalangeal joint at 30°.
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Proximal interphalangeal joint that has been splinted in extension for the treatment of a central slip injury.
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Dynamic spring extension splint for the treatment of a boutonniere finger deformity.
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