Had it done on my 11 year old sheltie/border collie mix in 1998 and he was fine afterwards - never limped or favored his leg. At that time I paid $600. We lived in a coach house condo and the bedrooms were upstairs. My hubby carried him up and down the stairs faithfully for weeks until my vet told me it was safe for him to do the stairs. Yes, I would have it done because for us it solved the problem and Mike never had anymore trouble. But of course you have to make that decision. Whatever you decide, I wish the best for Bella and hope she doesn't have any more trouble with her knee.
Rita
Andy the sheltie
and Nicky, the wonder horse