Concept
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Bone and Joint Disorders
Osteoarthritis of the Finger Joints
The formation of hard nobs at the middle finger joints (known as Bouchard's nodes) and at the farther away finger joint (known as Heberden's node) are a common feature of Osteoarthritis in the hands.
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"800px-Heberden-Arthrose.JPG."
https://en.wikipedia.org/wiki/Osteoarthritis%23/media/File:Heberden-Arthrose.JPG
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