four corner fusion

Hello,

My name is Sean I recently had a four corner fusion. I had a rating done on my wrist recently and was evaluated at 13% loss of use. The party involved has a lot to gain from this rating. I have a very visible loss of use easily more than half of the use I once had before the surgery.  I have done some research and from what I have read is that a 30% loss of use or more is the average loss of use. Is this an average finding from all the research done on past individuals with a four corner fusion? Have you ever heard of such a recovery like a 13% loss of use when someone had a four corner fusion done on a wrist? Or what would be the average loos of use in the wrist after a four corner fusion surgery? Thanks you for your time on this!