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Closed dislocation of thumb Interphalangeal (IP) joint is rare, due to the inherent stability of the thumb IP joint. The interposition of the volar plate, flexor pollicis longus, sesamoids, and digital nerves can treat the joint closed reduction. In this study, we report a case of three-week-old irreducible closed dislocation of thumb IP joint in a 33-year-old woman. We planned to perform open reduction surgery using a dorsal approach on the IP joint and the ulnar side opening. The volar plate was interposed in the joint. Seven months after surgery, the patient achieved 0-45 degrees of IP range of motion. No sign of degenerative joint changes on the x-ray images was observed in the final visit. This study suggests the high probability of open reduction for these injuries and recommends the use of dorsal approach, excluding the complications of volar approach.

Keywords: Thumb dislocation, Irreducible, Interphalangeal joint

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