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| 1º Degenerative Arthritis |
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| Hands |
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| l | Not due to
mechanical stress |
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| l | F:M 10:1 |
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| l | Most often
involves DIP joints |
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| n | Sclerosis |
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| n | Marginal
osteophyte formation |
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| l | 1st
MCP joint of thumb |
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