Well as far as I can gather there are two steel rods pinned to the two shin leg bones and I’m not sure how much of those have been removed. I get the names the wrong way round. Also there are metal plates either side of the knee and at least two hinges in it possibly three. To be honest I’m afraid to ask.
I can understand you not wanting to know the details but I think in the long run it'd be better if you know. If you have to discuss your surgery with someone in the future you need to have the details as they might not have access to your records.
Get as much physio as you can from the NHS even if you have to keep nagging. There are long waits in this area. And do the exercises they give you.