Can x-ray be helpful to see if carpal tunnel surgery is done correctly?

No : Unfortunately xrays only define skeletal structures. Anerve conductioon study wiulddetermine if the conduction delay of the median nerve had. Been corrected. Alternatively an MRI moght dineate any complication such as scar tissue

Probably not: The only information regarding carpal tunnel syndrome by X-Ray is underlying arthritis or bone problem which should be apparent on careful exam alone. The tissues involved in carpal tunnel are not radiodense so little information would be gained by ordinary X-Ray.