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. Author manuscript; available in PMC: 2018 Feb 22.
Published in final edited form as: J Am Acad Orthop Surg. 2013 Feb;21(2):88–98. doi: 10.5435/JAAOS-21-02-88

Figure 1.

Figure 1

Photographs of the lateral (A) and volar (B) views of the proximal interphalangeal joint (PIPJ). The head of the proximal phalanx (P1) is bicondylar and roughly cylindrical in the sagittal plane. The base of the middle phalanx (P2) is biconcave and has a centrally located intercondylar ridge. The contours of this bony anatomy impart some stability to the PIPJ. (Reproduced from Hogan CH, Nunley JA: Posttraumatic proximal interphalangeal joint flexion contractures. J Am Acad Orthop Surg 2006;14[9]:524–533.)