I've never heard of that procedure. I had my knees replaced at age 40. I find it amazing how some doctors will not replace knees of younger people while others will.
Could you further clarify by what you mean by ‘my knee is bone on bone’?
Do you have any history of trauma?
Any pain? If so how much is the severity?
Or is it simply a cosmetic deformity.
Else is it a bone tumor?
Answers to these questions would enable to help you better.