Here is a quick article form the American Academy of Orthopaedic Surgeons on the use of Supplements before surgery:
Herbal Supplements May Cause Dangerous Drug Interactions in Orthopaedic Surgery Patients
Discontinuing use prior to surgery can help avoid adverse events (Rosemont, IL)
Complementary and alternative medical (CAM) treatments such as herbal supplements have become increasingly popular in the United States, especially among older patients and those with chronic pain. However, many of these products can have serious and potentially harmful side effects when combined with medications prescribed during and after surgery, according to a review article in the Journal of the American Academy of Orthopaedic Surgeons (JAAOS).
About 20 percent of prescription users also take an herbal supplement, and those rates are higher — studies suggest between 35 and 70 percent — among orthopaedic patients who are candidates for surgery…
“The Impact of Complementary and Alternative Treatment Modalities on the Care of Orthopaedic Patients” – David T Rispler, MD and Julie Sara, MD – Whole Article. (PDF)