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Review Question - QID 220050

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QID 220050 (Type "220050" in App Search)
A 9-month-old male presents with basal metacarpal aplasia and a deficient right 1st carpometacarpal (CMC) joint. Parents note that his deformity has been present and worsening since birth. On exam, motion is absent at the metacarpophalangeal (MCP) and interphalangeal (IP) joints in the right thumb, with underdevelopment of the thenar musculature. Among the answers below, which is the most appropriate definitive treatment option for this patient?