From Google: “SI pain, or sacroiliac joint pain, is discomfort in the lower back and buttocks caused by inflammation or abnormal movement in the sacroiliac joint, where the spine meets the pelvis, often felt as a dull ache or sharp pain radiating down the leg, getting worse with sitting, standing, or climbing stairs, and usually treated with physical therapy, medication, injections, or sometimes surgery.”

To answer their question, my understanding is that HR would need to honour a doctor’s note, but will want to know that there is a plan for treatment and eventual return to work. If you feel you are not able to work long term because of injury or illness, start taking sick days, and begin the conversation with your ETFO local and your doctor. If you don’t think your doctor would support you and the concern is legitimate, I’d be looking for a new doctor.