Table 1: Classification of Eaton and Littre.
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Classification of Eaton and Littre |
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STAGE I |
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Normal or slightly widened trapeziometacarpal joint, normal articular contours, trapeziometacarpal subluxation |
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STAGE II |
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Decreased trapeziometacarpal joint space, Trapeziometacarpal subluxation, osteophytes or loose bodies less than 2 mm in diameter |
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STAGE III |
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Further decreased trapeziometacarpal joint space, subcohondral cysts or sclerosis, trapeziometacarpal joint of one third or more of the articular surface, osteophytes or loose bodies 2 mm or more in diameter |
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STAGE IV |
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Involvement of the scaphotrapezial joint or less commonly the trapeziotrapezoid or trapeziometacarpal joint to the index finger |