Back & leg pain

I noticed a couple of days ago that my back seems to be “caving in”. It is my lower back. I had 3 months of intensive chemo. When I stand up or bend over, my legs shake like crazy. It takes anywhere from say 5 to 30 seconds for that to stop.
Just wondering if anyone else has noticed these symptoms.


Have you had your spine MRIed and CT scanned? You may have a tumor in your lower back. I had one in my sacrum that was causing similar symptoms, and then it broke. I am undergoing my 5th round of spinal reconstruction, along with radiation a chemo. Mutiple Myeloma set up shop in my spine causing catastrophic failure.