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Dear Customer
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Does usually athrogryposis patient walk ?
its depends on the type of deformity and its severty  ,but usually athrogryposis patient wont be able to walk , but other treatment options are usually done to reduce this deformity effects and reduce the symptoms and allow more motion ability to the effected area 
What are the treatment options usually in case of athrogryposis :
as you know , the main options are usually :
- surgical options to correct the deformties 
- physical therapy 
- brace and outer supporting tools 
Our advices :
we advise now just to keep on with the current treatment which is surgical and physical therapy , and after your child sitution got stablized , you may start looking for new options or tool to help your child to walk as a external supporter 
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Kind Regards