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Stages (A) I, (B) II, (C) III, and (D) IV carpometacarpal arthrosis of the Eaton-Littler classification system, and as described by Eaton et al. are shown. (Published with permission from Eaton EG, Lane LB, Littler JW, Keyser JJ. Ligament reconstruction for the painful thumb carpometacarpal joint: a long-term assessment. J Hand Surg Am. 1984;9: 692–699.).
