The Factors Impacting on Patient-Reported Outcomes After Bicruciate-Stabilized Total Knee Arthroplasty for Varus Knee Osteoarthritis

BackgroundThe aim of this study was to investigate the factors affecting patient-reported outcomes after bicruciate-stabilized total knee arthroplasty (BCS TKA) in patients.MethodsWe retrospectively examined 122 knees with primary varus knee osteoarthritis that underwent BCS TKA. This study analyzed preoperative, intraoperative, and postoperative predictors of patient satisfaction and persistent postsurgical pain following BCS TKA at 1 year after surgery. We evaluated persistent postsurgical pain using Knee Injury and Osteoarthritis Outcome Score (KOOS) pain subscale and patient satisfaction using a visual analog scale.ResultsThe univariate analysis showed a significant negative correlation between the KOOS pain subscale and three factors: the preoperative central sensitization inventory (CSI) score, medial joint laxity at 90 degrees flexion, and acute postsurgical pain. Patient satisfaction was significantly positively correlated with lateral joint laxity at 90 degrees flexion and postoperative extension angle. Acute postsurgical pain had a significant negative correlation with patient satisfaction. The multiple regression analysis revealed preoperative CSI score and medial joint laxity at 90 degrees flexion influenced patients' KOOS pain subscale responses. Only lateral joint laxity at 90 degrees flexion had an impact on patient satisfaction.ConclusionsThe acquisition of adequate soft tissue balance according to the concept of BCS TKA and preoperative central sensitization syndrome affects the clinical outcomes in BCS TKA.