Aromatherapy in Total Knee Replacement

The purpose of this pilot randomized controlled trial is to investigate the effects of aromatherapy on postoperative anxiety and pain in total knee replacement patients. The main questions to answer are: Does Lavender-Peppermint Aromatherapy reduce post operative anxiety in patients after primary total knee replacement when compared to placebo? Does Lavender-Peppermint Aromatherapy reduce post operative pain in patient after primary total knee replacement when compared to placebo? Does Lavender-Peppermint Aromatherapy reduce postoperative opioid consumption after primary total knee replacement when compared to placebo? Does Lavender-Peppermint Aromatherapy reduce postoperative nausea and vomiting after primary total knee replacement when compared to placebo? Participants will be assigned to one of the following groups at random: * Intervention: Aromatherapy with the lavender-peppermint scent * Control: Aromatherapy with the almond oil scent Participants will also be asked to complete pre- and post-operative questionnaires. Researchers will compare both groups (intervention vs control) to see if aromatherapy reduces post-operative anxiety, pain, opioid intake, and nausea/vomiting.