Knee Replacement Surgery Risk For “high Risk” Person?

High Risk Male Needing Knee Replacement Surgery?
Risk Factors: COPD/Emphysema, Sleep Apnea, Atrial Fibrillation, Age 70 & Over Weight 50+ lbs.
Is Partial or Complete Knee Replacement Surgery Advisable (Pros/Cons). Very Concerned w/respitatory problem causing death &/or ventilator due to anesthesia..
Appreciate hearing others and their experience.
Additional Details
13 hours ago
On Oxygen 24/7’s, Bi-Pap Machine at night. Had previous back surgery (clean-up ruptured disk). Surgeon is suggesting Spinal w/Mild Sedation, Nerve Block in croin area. Would scare tissue in the lower back create problems for a Spinal?