Happy to hear you are getting pain meds and getting treated.
I have had different reactions from pain meds, sometimes my sugars go down and sometimes they go up. Just depends on which kind of meds I suppose. Also when you are in pain I think that can cause your sugars to be elevated just from the pain and stress of pain; when it is relieved by pain meds, it could cause sugars to come down a bit. You might want to ask your doctor if they get too low but from what you have posted they seem to be in a good range for morning readings. Wish mine were down (always have had a high morning number and I take meds and insulins).
Keep us updated on knee pain .
Hope you are feeling better soon.
Marge