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Pateller tendon repair is usually done under general anesthesia
. Individual is made unconscious and relaxed by anesthetist. Marijuana is cannabis drug, it causes abolition of pain and CNS stimulation in general. You didn't mention its use in pre anesthetic
checkup, but it is a drug that may cause difficulty in getting proper sedation and relaxation. It may interfere with proper anesthesia. So I advise you to disclose her marijuana status other wise it may hamper in her surgery.
Dr. Seikhoo Bishnoi