Tery,
I'm curious... if you're having some relief from an unloader brace, then your joint damage must be primarily in one compartment? (A huge conjecture on my part, I'll admit.)
I'm wondering if you've ever been offered a unicompartmental knee replacement (also known as a partial knee replacement)? Or, a total knee replacement, if you have damage in more than one compartment.
Essentially, the HTO is just a super unloader -- it's meant to change your weightbearing surface to another part of your joint. Some people use it to buy time before having a total knee replacement, but if you're a candidate, a unicompartmental replacement is a very useful and successful alternative.
Just my thoughts...

Meg