This is a very good question. Both medications are anti-androgens. Androgen is a helpful anabolic hormone and deficiency might negatively impact a fusion.
However, I have had fracture patients on these medications and the fractures still healed normally so I would say there could be a theoretical impairment but probably not a clinical problem.
I am unaware of any studies to this subject but you might search Pubmed for any articles on this.
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Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.