I see the study was for fractures, not CTS, but they did hypothesize :
:.......Our hypothesis is that this beneficial effect of prophylaxis would be useful in other forms of trauma.".........

Couldn't hurt. Vit C has many other benefits, as well &
you cannot O.D. on it - excess is passed thru urine, I believe.
Could be useful for post operative CTS surgery recovery,
or maybe even help CTS symptoms without surgery?