Background We investigated the impact of eliminating the impingement between extensor mechanism and tibial insert on patellar tracking and patellar ligament tension in high knee flexion.Methods Six cadaveric specimens were tested on an Oxford-type testing rig.The Genesis Ⅱ knee system was implanted into each specimen knee with the traditional tibial insert and high-flex insert successively.Compared to traditional insert, the high-flex insert was characterized with a chamfered anterior post and a chamfered anterior lip which eliminates patella-post and patellar ligament-anterior lip impingements.The patella was tracked with an NDI Optotrak Certus system.The patellar ligament tension was measured using a NKB S-type tension transducer.Results There was a decrease of resultant patellar translation relative to the femur with statistically significant （P 〈0.05）at 90° to 150° of knee flexion and a decrease of patellar ligament tension with statistical significance （P 〈0.05） at 100°,120°, 130°, and 140° of flexion using high-flex insert compared to traditional insert.Conclusions Eliminating the impingement between extensor mechanism and implant in high knee flexion altered patellar tracking and reduced patellar ligament tension, which would facilitate high knee flexion.
