What Could Be Causing Osteoporosis, Elevated Parathyroid Hormone, Weight Loss, And Persistent Knee And Upper Back Pain?

Hello, I m a 62 yr. old female. I broke my knee cap and had a Dexiscan revealing osteoporosis. Parathyroid 121, Vit. D 37, Calcium went from 9.4 to 9.7. No monoclonal protein detected. Free Kappa light chain-26; ratio 1.6. My hemoglobin was 12 and rdw. elevated. other blood work within range. Lost 10 pounds and knees and upper back constantly hurt. I welcome your thoughts-Thx