Refracture of the Tibial Post after Posterior-Stabilized Total Knee Arthroplasty: Case Report and Literature Review

Background: Tibial polyethylene wear is related late failure in total knee arthroplasty. The cruciate substitute design depending on the campost mechanism to secure the knee cinematics after a posterior stabilized total knee arthroplasty (PS-TKA). A post fracture can occur after damage failure of the post. Aim: Report a case of post refracture after a PS-TKA and review the lecture about post wear in PS-TKA. Case presentation: A 63 woman with a primary TKA had a diagnosis of polyethylene post fracture. The polyethylene exchange wasn’t enough and revisions of all components were necessary. Conclusion: In patient with previous well function, subtle swelling and giving away sings after PS-TKA, a post fracture must be excluded.

Evaluation of Intraobserver and Interobserver Reliability of Mechanical Axis Alignment Measure of the Lower Limb through the Panoramic Radiograph in Patients in the Preoperative and Postoperative Periods of Total Knee Arthroplasty

Objective: To evaluate intraobserver and interobserver reliability of the measurement of the mechanical axis of the lower limb by means of the panoramic radiograph of lower limbs by physicians with different levels of medical practice. Method: A retrospective cross-sectional study with preoperative and postoperative radiographic analysis of a group of 100 patients submitted to total knee arthroplasty. Results: It was observed that there is a highly significant intraobserver and interobserver agreement (p < 0.0001), both preoperatively and postoperatively, among four observers with different training levels. Conclusion: The panoramic radiograph of the lower limbs is a reliable method for measuring the mechanical axis of the lower limb in patients submitted to total knee arthroplasty, regardless of the level of medical practice of the evaluator.