Mobile-Bearing Total Knee Arthroplasty Improves Patellar Tracking and Patellofemoral Contact Stress

International Comparative Evaluation of Knee Replacement with Fixed or Mobile-Bearing Posterior-Stabilized Prostheses

“…In biomechanical testing, mobile bearings were found to reduce both contact stress and polyethylene wear; this has the potential to decrease the risk of revision, particularly in younger and more active patients [3][4][5][6][7] . It has also been argued that mobile bearings have the potential to enhance patellar tracking, reduce pain, enhance function, and reduce patellofemoral-related revision 8 . Many studies have compared clinical and radiographic outcomes of mobile and fixed-bearing total knee prostheses 4,5,7,[9][10][11][12] .…”

Mobile Bearing Total Knee Arthroplasty for Valgus Knee Osteoarthritis with Permanent Patellar Dislocation: A Case Report and Review of the Literature

“…It can theoretically adjust rotational malalignment by its self-align feature. Moreover, it has been reported that mobile bearing insert significantly improved patellar tracking with decreased patellofemoral contact stresses than fixed bearing insert in an intraoperative kinematic study [6]. This case demonstrated that some cases of permanent patellar dislocation with TF joint OA can be treated by mobile bearing TKA with lateral retinaculum release, without any other proximal or distal realignment surgical procedures.…”

“…To our knowledge, however, there is no report about TF joint OA with permanent patellar dislocation treated by mobile bearing TKA with lateral retinaculum release. Mobile bearing TKA can theoretically adjust rotational malalignment by its self-align feature and improve patellar tracking and patellofemoral contact stress [6]. Our case demonstrated the therapeutic potential of mobile bearing TKA with lateral retinaculum release for TF joint OA with permanent patellar dislocation.…”

“…It is known that femoral and tibial components positioned in internal rotation cause patellar maltracking [12, 13], lateral positioning of the femoral component improves patellar tracking [14], and medial positioning of the patellar component results in smooth patellar tracking [15]. Furthermore, mobile bearing TKA can theoretically adjust rotational malalignment by its self-align feature and improve patellar tracking and patellofemoral contact stress [6]. …”

The linea aspera as a rotational landmark: an anatomical MRI-based study

“…The authors hypothesized that this latter difference was due to the improved design of the modern rotating implant compared to that of the fixed implant [22]. Another hypothesis could be that the rotating hinge provides some automatic correction to inadequate femoral rotation as it has been demonstrated in standard mobile knee replacement [21]. Last, besides patellofemoral maltracking, it could be that malposition of the femoral component in rotation generates unfavorable mechanics.…”