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 primary research questions 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? 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 and/or pain.
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Changes in Anxiety level before and each individual day after surgery.
Timeframe: Measured pre-operatively, in the post-anesthesia care unit (PACU), post-operative day (POD) 1, POD 2, POD 3, POD 7
Difference in anxiety level before and after surgery
Timeframe: Measured pre-operatively and on post-operative day (POD) 7
The average pain score after surgery
Timeframe: Measured pre-operatively, in the post-anesthesia care unit (PACU), post-operative day (POD) 1, POD 2, POD 3, POD 7