Hi Fitzy, I've had similar (an arthroscopic decompression) on my shoulder and and also both hips replaced too, you just leave your pump connected. They will test your BG's during surgery, in my case they were not interested in my CGM only their manual BG tests and left my CGM receiver in my room.
They will probably ask you to turn down your basal by around 50%, that's what I have always done from an hour or two before until post surgery.
For my hips (done in last 11 wks) I have to double my basal for few days post op.
Hope it goes well.
Oh something new I learnt, Ibruprofen delays bone healing so should not be taken post major bone surgery, I had a few issues with Paracetamol and asked to change but in the end decided to live with it.