The talonavicular joint is part of the ankle. The hypertrophic degenerative changes would be the build up of extra tissue in the ankle. This can cause the joint to not flex the way it should.

an accumulation of fluid in the ankle

This isn't a joint; it's a muscle. But if you were wondering what joints are involved with the extensor digitorum longus, they are the PIP joint and talonavicular joint.

A lump on your foot could be metatarsal-cuneiform joint exostosis depending on where the bump actually is, the talonavicular joint is pretty close by and this joint is also prone to exostosis.

Or.

Excess growth. witch is normally harmless, and surgery could be done to remove them, but that is only recommended if it was pushing on a nerve very close to them and causing nerve pain.

if you have a lump on your foot you should see a good doctor.

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