I'm happy to hear that the surgery was successful in solving the tumor issue, and sorry to hear thst you're now having issues with the results.
FWIW - I'm not surprised that the doctors seem less than knowledgeable. Medicine is one of the few endeavors that found it necessary to coin important sounding words that really mean "I don't know".
I suggest to arrange a visit with someone knowledgeable in sports medicine, or maybe a rehab specialist who is familiar with the type of surgery.
These guys are the most knowledgeable about problems like yours. They may not be able to offer much by way of improving the leg strength, but at the very least, they'll help you manage the imbalance, and offer some peace of mind about how much cycling may or may not be too much.
BTW - before seeing anyone about this, ask your old doctor for whatever he has regarding exactly what was done. Having the records will save you time and expense getting the new guys up to speed.
__________________
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
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