Finger PIP joint forced flexion, volar (palmar) dislocation and those with difficulty extending the PIP joint need to have their central slip or zone 3 extensor tendon tested. If a central slip lesion is overlooked, the patient will often develop a boutonniere deformity after 2-3 weeks. “Skier’s thumb” with an injury to the UCL with a radial and hyperextension force to the MCP joint, like landing on a ski pole can cause a “Stener lesion” where the UCL is displaced superficial to the adductor apo

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