My knuckles are concave, and lock into place, how to fix it?

Particularly if the dislocation/subluxation occurred some time ago it is definitely not something that you should tackle yourself!

If you've dislocated a knuckle, it needs to be put back. This is a job for a sports injury specialist. It's worth getting it X-rayed in case there are loose bits of cartilage in the joint.

Start with your doctor. If he won't refer you to a sports injury clinic, find one yourself.

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