I have a 7 year old American Bulldog mix. 4 months ago he had TPLO surgery. Two months into the recovery he started

Customer: I have a 7 year old American Bulldog mix.  4 months ago he had TPLO surgery.  Two months into the recovery he started having a lot of pain, whining and crying near constantly.  The vet said the plate (the dog was in between plate sizes, so the vet opted for the larger plate) was pinching into his joint capsule and causing him pain.  Not being able to tolerate pain meds other than Tyl with codeine, at the end of the three-month healing period the plate was removed.  Plate removal did little to improve his agony.  The vet prescribed antibiotic and more pain meds, hypothesizing there may be infection in the dog's knee.  At this point, the dog goes from constant crying when not on pain meds to sedation when on them.  Without pain medication he is restless and wakes up every 1-3 hours throughout the night crying in agony.  I have to pick up his hind quarters so he is able to shift around and adjust his positioning.  A few days ago I took him, x-rays and medical records to a different vet.  Immediately the vet pointed out the hellacious bone spur (over an inch long) protruding from the tibia into the knee/humerus (in addition to other smaller spurs and arthritis) - I have photos I can send to show.  She referred me to an orthopedic vet to schedule surgery to have the spurs and arthritis removed - the ortho appointment is next week.  The spurs are too far progressed to scope his knee so the ortho has to open the knee to clean out the joint.  My concern is, after all that he's been through, will this surgery fix him or will it be the first round of subsequent surgeries to remove more spurs in the future?  I know it sounds radical, but would removing his leg avail longer term quality of pain-free living for him?  It's obviously been an expensive road and I will proceed with the spur removal surgery if it will provide the most successful result for pain-free living, but I do not want to put him through more pain, recovery and rehabilitation to then end up no better off that when he started.