First bone scan after treatment

Hello everyone! I was diagnosed in September 2018 with IDC grade 2 stage 3A, I had AC + T, I had surgery and rads. Now in tamoxifen. I recently had my first post-treatment bone scan. Last year's scan (before chemo) said: "hypercaptant areas with pathological significance are not observed." In this new scan, the technique complained because my previous report "said nothing". The new scan shows "increased uptake in coxofemoral joint compatible with a degenerative process" I will see my MO in a month or so. Can it be an osteoarthritis/osteoporosis or some other bone disease that is not cancerous? Could it have been present in my previous scan and was not classified as "pathological significance? Any feedback is welcome, thanks