To my knowledge,
There is only 1 paper with 5 MS cases underwent spine fusion in 1994 at Mayo.
Unfortunately, electronic version of the paper is not available. Hope
this helps reassure you that it should not be that risky for your mom
to undergo the surgery.
Thira Woratanarat MD, MMedSc, DHFM
1: Spine. 1994 Feb 1;19(3):323-8.
Transthoracic disc excision and fusion for herniated thoracic
discs.Currier BL, Eismont FJ, Green BA.
Department of Orthopedics, Mayo Clinic, Rochester, Minnesota.
Transthoracic discectomy and fusion were performed on 19 patients for
a central or central-lateral herniated thoracic disc. At initial
visit, 14 patients had evidence of myelopathy, 5 had bowel or bladder
dysfunction, and 13 had pain. Previous laminectomy in three patients
compromised the result of later anterior decompression. Coexistent
multiple sclerosis was diagnosed in two patients, who had an atypical
postoperative course. The overall results of transthoracic discectomy
and fusion in patients without prior laminectomy or coexistent
multiple sclerosis were excellent in six, good in six, fair in one,
and poor in one, demonstrating that it is a safe and effective
PMID: 8171365 [PubMed - indexed for MEDLINE]