Zimmer® LPS-Flex Mobile Bearing Knee

Are you seeking more natural kinematics for your patients?

The anterior pivot of the LPS-Flex Mobile Bearing Knee is positioned near the ACL entry point to naturally replicate anatomical knee rotation.1,2 Whereas central pivoting designs are positioned further from the ACL entry point.

Are you concerned about patellar related complications after TKA?

The literature shows that greater patellofemoral forces could cause anterior knee pain, patellar subluxation and dislocation, component wear, damage and loosening.3,4 The anterior pivot of the LPS-Flex Mobile Bearing Knee leads to less patellofemoral forces than central pivoting designs since it is more closely positioned to the tibial tubercle. Greater medial/lateral displacements, caused by central pivoting designs, increase patellofemoral forces since they rotate further from the tibial tubercle.

Have spin-outs occurred with other mobile bearing designs?

The LPS-Flex Mobile Bearing Knee is designed with an anterior stop to prevent bearing spin-outs reported with other systems.5,6 The design allows for 25° of internal and external rotation before engaging the anterior stop. This facilitates full clearance during natural rotation along with the added confidence in case of abnormal rotation.

To learn more about the safe and effective use of the LPS-Flex Mobile Bearing Knee:

View Medical Education events
Contact your Zimmer Sales Professional

References

  1. Scuderi G.R. et al. In vivo kinematic evaluation and design considerations related to high flexion in total knee arthroplasty. Journal of Biomechanics. Number 38, pp 277-284. 2005.
  2. Hollister A.M. et al. The Axes of Rotation of the Knee. Clinical Orthopaedics and Related Research. Number 290, pp 259-268. 1993.
  3. Smith A.J. et al. Pre-surgery knee joint loading patterns during walking predict the presence and severity of anterior knee pain after total knee arthroplasty. Journal of Orthopaedic Research. Number 22, pp 26-266. 2004
  4. Browne C. et al. Patellofemoral forces after total knee arthroplasty: effect of extensor moment arm. The Knee. Number 12, pp 81-88. 2005.
  5. Stiehl J.B. Clinical results and complications in mobile bearing total knee arthroplasty. Instr Course Lect 2005;55:233.
  6. Thompson N.W., Wilson DS, Cran GW, et al. Dislocation of the rotating platform after low contact stress total knee arthroplasty. Clin Orthop 2004;425:207.