EnduRo Rotating Hinge Knee System

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Longevity, mobility and dislocation safety for stable conditions in joint replacement

Due to today's growing demographic situation, revision operations will continue to play a significant role in the future. The particular challenges of hinged implant revisions require an implant that performs the functions of the collateral ligamentous apparatus without restricting essential joint functions such as flexion and rotation.

The EnduRo system offers this flexibility with 24° rotation and a flexion angle of up to 140°. The sophisticated lift technology of the axis mechanism supports the axis while preventing dislocation and allowing for insertion of the tibial stem offset near the jointline. The axis is coupled with the femoral component through a tapered cone and is equipped with a locking nut to prevent dislocation.

An extensive product portfolio including various implant sizes, augments, stem extensions and gliding surfaces gives the surgeon the flexibility to adapt the implant to the patient. The EnduRo system is based on the use of proven cobalt-chromium-molybdenum components in combination with carbon fiber reinforced PEEK for the materials of the axis-bearing components. Promising in-vitro results have indicated that and increased longevity of these implant components can be expected [1]. In addition, the optional AS Advanced Surface version can reduce the release of metal ions and improve wear behavior, which was demonstrated during in-vitro experiments [2-5]. Precise implementation of the preoperative planning in the operating room is essential for the success of the procedure. The EnduRo instruments are designed to support just that and enable reproducible surgical procedures for the physician and the team.

[1] Schierjott RA, Giurea A, Neuhaus HJ, Schwiesau J, Pfaff AM, Utzschneider S, Tozzi G, Grupp TM. Analysis of Carbon Fiber Reinforced PEEK Hinge Mechanism Articulation Components in a Rotating Hinge Knee Design: A Comparison of In Vitro and Retrieval Findings. Biomed Res Int. 2016;2016:7032830. Epub 2016 Dec 22.

[2] Grupp TM, Giurea A, Miehlke RK, Hintner M, Gaisser M, Schilling C, Schwiesau J, Kaddick C. Biotribology of a new bearing material combination in a rotating hinge knee articulation. Acta Biomater. 2013 Jun;9(6):7054-63. Epub 2013 Feb 26.

[3] Affatato S, Spinelli M, Lopomo N, Grupp TM, Marcacci M, Toni A. Can the method of fixation influence the wear behaviour of ZrN coated unicompartmental mobile knee prostheses? Clin Biomech (Bristol, Avon). 2011 Feb;26(2): 152-8. Epub 2010 Oct 8.

[4] Grupp TM, Schwiesau T. Determination of the wear behavior of the UNIVATION mobile knee system T018, Mar 2007.

[5] Reich J, Hovy L, Lindenmaier HL, Zeller R, Schwiesau J, Thomas P, Grupp TM. Präklinische Ergebnisse beschichteter Knieimplantate fur Allergiker. Orthopäde. 2010 Mai;39(5): 495-502.