If you get it fused because of arthritis it probably means that you are having quite some pain!? The pain should go away after surgery. But the mobility will be restricted. After surgery you should always follow the advice of your surgeon.
And then you should look for good orthotics and the right shoes to compensate for the loss of mobility.
Have a good and quick recovery! I would be happy to help you figuring out the best way for you to keep doing the things you like!