Factors Associated with Decisional Regret After Shared Decision Making for Patients Undergoing Total Knee Arthroplasty.

Total knee arthroplasty (TKA) is a treatment for knee pain, but some patients are not satisfied with their outcomes. Utilizing shared decision making (SDM) can lead to better decisions, satisfaction, and fewer regrets. However, healthcare professionals have little knowledge of risk factors for regret. The aim of this study is to evaluate decisional regret using the Decision Regret Scale (DRS) after primary TKA among patients who engaged in SDM. A total of 118 patients who underwent TKA surgery between March 2020 and May 2022 participated in this study, and they were able to reflect on their outcomes. The primary outcome was decisional regret assessed using the DRS, and the secondary outcome was post-operative pain at a three-month follow-up, measured using the Lequesne Index. The study found that 49% of the patients reported no regret, 25% reported mild regret, and 26% reported moderate-to-severe regret. There was a significant correlation between greater levels of decision regret and a higher three-month Lequesne Index. Post-operative pain and post-operative mobility status and the range of motion of the knee joint were also strongly correlated. The study found that more than half of the patients undergoing primary TKAs experienced regret even following SDM counseling. Regret levels were associated with higher post-operative pain and poorer mobility. This underscores the importance of informing patients about potential adverse effects of TKA to manage their expectations and reduce regret in future SDM interviews. This study incorporated patient perspectives through their direct engagement in the SDM process prior to surgery. Patients participated in the design of the SDM framework, which included educational pamphlets and structured interviews to assess their values and preferences. Their involvement ensured that the SDM procedure was tailored to patient-centered outcomes. Furthermore, the follow-up assessments were conducted with patients to evaluate decisional regret and post-operative outcomes, providing valuable insights into the effectiveness of the SDM process. By actively participating in the research through decision making and outcome reflection, the patients contributed to the understanding of factors influencing decisional regret after undergoing TKA.