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San Carlos, CA
A 48-year-old male asked:

what may be the cause of sharp pain in the top knuckle of my index finger? it happens often when extending my finger

3 doctor answers5 doctors weighed in
Dr. Richard Makowiec
Hand Surgery 27 years experience
Couple of things: There are actually many things that can cause pain at that "knuckle." arthritis can present as pain, synovitis or joint inflammation can also cause pain. Other potential causes include a sprain or strain of either of the collateral ligaments, or the extensor mechanism. A thorough exam and xrays by a hand surgeon can probably give you a definitive answer.
Dr. Christian Foglar
Orthopedic Surgery 32 years experience
Either joint or tend: It should be either joint or tendon related but more likely tendon. Can't tell you more than that without looking and feeling it.
Dr. Vincent Yamamoto
Orthopedic Surgery 34 years experience
Several causes: There are several possible causes of your pain. If your finger gets caught in mid-flexion and then snaps, then you have a trigger finger. If the knuckle joint swells or aches, then it can be arthritis in the joint. If there has been any injury to the knuckle, then it could be a deep contusion to the joint or to the tendon which runs over the joint. I would take some advil (ibuprofen) or alleve and protect.

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Last updated Jun 17, 2017
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