Two anesthetics 37 days apart can be safe for some healthy patients, but the decision should be based on your recovery from the first operation, not just the number of days between surgeries. After an SI fusion, the main concerns are mobility, blood clot risk, pain medication use, wound healing, infection risk, anemia, and whether you can safely tolerate the positioning and length of a deep plane facelift. Before proceeding, your spine/orthopedic surgeon, facelift surgeon, and anesthesiologist should all agree on the timing. Ask specifically when you can stop or continue any blood thinners/anti-inflammatory medicines, whether there are restrictions on lying flat or turning your head/neck, and whether updated labs or medical clearance are needed. If there is delayed healing, fever, infection, calf pain, chest symptoms, shortness of breath, or limited mobility after the SI fusion, the facial surgery should be postponed until you are fully cleared.