2011
DOI: 10.1016/j.clinbiomech.2011.04.002
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Influence of post-cam design of posterior stabilized knee prosthesis on tibiofemoral motion during high knee flexion

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Cited by 30 publications
(45 citation statements)
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“…A damping coefficient of 0.5 (n s/mm) was applied to the lateral meniscus The only muscle considered in the current model was the quadriceps, with a 5° valgus to the mechanical axis of the femur. Both the quadriceps tendon and patellar tendon were also included, with stiffness coefficients of 2,000 and 1,142 n/mm respectively [20]. To simulate the wrapping of the quadriceps tendon around the trochlear groove during knee flexion, two rows of rigid beads were built along the medial and lateral bundles of the quadriceps tendon [18] (Fig.…”
Section: Methodsmentioning
confidence: 99%
“…A damping coefficient of 0.5 (n s/mm) was applied to the lateral meniscus The only muscle considered in the current model was the quadriceps, with a 5° valgus to the mechanical axis of the femur. Both the quadriceps tendon and patellar tendon were also included, with stiffness coefficients of 2,000 and 1,142 n/mm respectively [20]. To simulate the wrapping of the quadriceps tendon around the trochlear groove during knee flexion, two rows of rigid beads were built along the medial and lateral bundles of the quadriceps tendon [18] (Fig.…”
Section: Methodsmentioning
confidence: 99%
“…Wear of the tibial post is inevitable as the cam and spine engage and rub against each other during knee flexion, and this can often lead to fracture of the post. As in Lin et al's study [28], a flat-on-flat design can be expected to experience greater edge loading on the posterior face of the post as the tibia rotates out of neutral alignment with the femur. For the 10° rotation models, Huang et al showed that curve-on-curve contact surfaces can reduce the maximum contact stress on the posterior tibial post by over 30% in comparison to flat-on-flat surfaces and can increase the contact area by 8%.…”
Section: Achieving High Knee Flexionmentioning
confidence: 96%
“…However, in PS knees, the interaction between the cam and spine as the knee is flexed, particularly at high flexion angles, will heavily influence both the motion of the knee and the longevity of the implant itself; a greater contact area will increase stability and reduce localized contact stress on the spine. Lin et al evaluated two different post-cam contact shapes in PS knees, with flat-on-flat or curve-on-curve surfaces (Figure 2) [28]. Tibial rotation was shown to be comparable in both designs prior to post-cam engagement; an obvious deviation in plots was evident at around 45° knee flexion.…”
Section: Achieving High Knee Flexionmentioning
confidence: 99%
“…The post-cam mechanism is often seen in posterior stabilized knee prostheses in order to mimic the posterior cruciate ligament (PCL), minimize tibial posterior displacement, and increase posterior femoral translation [63][64][65] . Distal placement of the femoral cam as well as a larger femoral posterior radius can increase the amount of posterior femoral movement; however, excessive anterior or posterior cam placement can cause femoral rollback impingement or excessive rollback, respectively [64] .…”
Section: Design Considerations Aimed At Restoring Normal Tibiofemoralmentioning
confidence: 99%
“…Distal placement of the femoral cam as well as a larger femoral posterior radius can increase the amount of posterior femoral movement; however, excessive anterior or posterior cam placement can cause femoral rollback impingement or excessive rollback, respectively [64] . Femoral condyle rollback is seen in normal knee kinematics during knee flexion but may be decreased in TKA [26] (Figure 3).…”
Section: Design Considerations Aimed At Restoring Normal Tibiofemoralmentioning
confidence: 99%