Please try BRAGG'S ACV to dissolve the calcium deposits. Two cups of epson salts and 2 cups of acv and 1 quart of hydrogen peroxide and soak for 30 minutes or longer. You can do a foot bath if you can't get in the tub but you need to soak your back. You can also take it internally to do the same thing.
I'm sorry you're suffering but try this before surgery please these baths do wonders for me!