Based on kinematics and modern outcome measures, a medial pivot pattern may not significantly determine clinical success after total knee arthroplasty, according to study results.
Researchers performed a retrospective review of 141 consecutive TKAs. Intraoperative kinematic patterns were determined with sensor-embedded tibial trials. From 0° to 90° and from 0° to the terminal flexion, the center of rotation was identified. Using accepted criteria, investigators designated medial-pivot and non-medial pivot. Preoperatively and at a minimum 1-year follow-up, patient-reported outcomes were measured.
Intraoperatively, there were 40% of TKAs with medial pivot kinematic pattern. Investigators noted it was more common for posterior cruciate-retaining and posterior cruciate-substituting/anterior lipped implants to have a medial pivot pattern compared with posterior stabilized TKAs. There was no significant difference between the medial and non-medial patterns with regard to the minimum 1-year Knee Society scores and University of California, Los Angeles activity level, despite bearing type.
According to researchers, there were trends for greater median improvement in Knee Society objective and satisfaction scores in medial pivot knees among patients with posterior cruciate-sacrificing implants– by Monica Jaramillo
Disclosures: The authors report no relevant financial disclosures.