When is an ulnar reduction necessary with a tfcc tear to the central disc and positive ulnar variance lot of wrist pain after fall 2 months ago?

When the length of the ulna causes carpal impingement and potential for continued or new problems

If you have ulnar positive variance (a long ulna relative to the radius) and you have pain/loss of function that persists despite care with bracing, injections, therapy etc., then treatment with and ulnar shortening osteotomy ( a joint leveling procedure ) with or without wrist arthroscopy may be indicated.