5C® Knee System - implantcast

Connection through Innovation

Developed by implantcast in collaboration with experts from five continents, the 5C® knee system (5 continents) represents global expertise and forward-thinking design.
With four distinct system variants, each tailored to a specific kinematic principle, the system offers individualized solutions for a wide range of anatomical and functional needs.
Instability, patellofemoral complications, and symptoms resulting from poor fit or paradoxical kinematics are among the leading causes of revisions and patient dissatisfaction following total knee arthroplasty. The 5C® knee system directly addresses these challenges through a functionally driven design.

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Systematic Individualization Four Options for Optimal Care

5C®CR

(cruciate retaining)
The 5C® CR system relies on soft-tissue-guided stability and is aligned with the natural kinematics of the knee. Its single-radius design helps maintain consistent ligament tension, particularly in mid-flexion. Reduced congruency between the PE insert and the femoral component, especially in deep flexion, is intended to support physiological rollback, while the overall insert geometry is specifically designed to promote soft-tissue-driven joint motion.

https://www.implantcast.de/fileadmin/implantcast/Dokumente/Knie/Primaerendoprothetik/5C_R__Knee_System_CR_Flyer_EN.pdf
5C® LATic

(lateral stabilized)
The 5C® LATic system specifically supports the natural kinematics of the knee and preserves as many native stabilizers as possible. Lateral stabilization of the condyle near the extension reduces paradoxical anterior sliding and thus retropatellar pressure, which often leads to complications. In combination with the physiological rotation of the tibia, additional space is created for the patella.

https://www.implantcast.de/fileadmin/implantcast/Dokumente/Knie/Primaerendoprothetik/5C_R__Knee_System_LATic_Flyer_EN.pdf
5C® MEDic 

(medial pivot)
The 5C® MEDic system reconstructs the native anatomy and kinematics of the knee based on the principles described by Pinskerova and Freeman1, intentionally simplified in scope. A medial “ball-in-socket” articulation between the femoral component and the PE insert creates a stable medial pivot point, ensuring consistent guidance throughout the full range of motion. Laterally, the flat geometry allows controlled translation, supporting a physiological movement pattern.

https://www.implantcast.de/fileadmin/implantcast/Dokumente/Knie/Primaerendoprothetik/5C_R__Knee_System_MEDic_Flyer_EN.pdf
5C® PS 

(posterior stabilized)
The 5C® PS system provides reliable stability throughout the entire range of motion. An optimized box design with a coordinated cam-post mechanism enables controlled femoral rollback and enhances lever mechanics in deep flexion. Early cam-post engagement ensures knee stability during everyday activities such as stair climbing or standing up.

https://www.implantcast.de/fileadmin/implantcast/Dokumente/Knie/Primaerendoprothetik/5C_R__Knee_System_PS_Flyer_EN.pdf

[1] Source: Freeman MAR, Pinskerova V “The movement of the normal tibio-femoraljoint”, J Biomech. 2005 Feb; 38(2):197-208.


Uncompromising in Design, Reliable in Performance

The 5C® knee system combines consistency with flexibility:
Four system variants, each designed for a specific kinematic concept, provide tailored solutions for different clinical requirements. Despite these variations, all implants share core design principles that enable a standardized surgical approach. The internal geometry and instrumentation are identical across all variants, only the articular surfaces differ.
Each variant has its dedicated polyethylene (PE) insert, ensuring optimal kinematics through precise congruence with the femoral component. Accordingly, the femoral component defines the size of the PE insert.
On the tibial side, an anatomical fixed-bearing component is used. This allows cross-size combinations with five available insert sizes, offering additional intraoperative flexibility.


5C® femoral component

All four 5C® femoral components feature the same internal geometry and standardized bone resections. The differences lie exclusively in the design of the articulation surfaces, each optimized to support a specific kinematic pattern.

Key features

  • Single-radius design
  • Flat anterior shield with 2 mm opening
  • Sulcus angle >160° in extension
  • Minimum 2 mm lateralized trochlea
  • High-flexion knee design
  • 8 mm posterior and distal implant thickness
  • Proportional growth across sizes 

Product range

  • 5C® CR, 5C® LATic, 5C® MEDic, 5C® PS
  • 12 sizes, asymmetrical
  • Cemented fixation

Material

  • CoCrMo

Coating

  • uncoated
5C® PE inserts

The 5C® polyethylene inserts are tailored to each of the four system variants, ensuring exact congruency and controlled articulation between the femoral and tibial components without compromise.

Key features

  • 1 mm incremental options
  • Posteriorized contact points
  • Sizing defined by the femoral component
  • Five tibial component combination options

Product range

  • 12 sizes available in 9, 10, 11, 12, 14, 17, and 20 mm thicknesses
  • Symmetrical designs: 5C® CR, 5C® PS
  • Asymmetrical designs: 5C® LATic, 5C® MEDic

Materials

  • 5C® CR, 5C® PS: UHMWPE
  • 5C® LATic, 5C® MEDic: implacross® E
5C® tibial component

All four 5C® knee system variants are paired with an anatomical tibial component. Its design offers broad intraoperative flexibility, even in primary procedures, with options for stem extensions and spacers.

Key features

  • Anatomical design
  • Closed tibial plateau without holes
  • 3° posterior slope
  • Anteriorly positioned, medially aligned keel
  • Size-specific fins and keel
  • Five possible combinations with the PE inserts
  • Compatible with stem extensions and spacers
  • Percentage growth

Product range

  • 12 sizes, asymmetrical
  • Cemented

Materials

  • CoCrMo

Coating

  • Uncoated
Surgical Workflow & Instrumentation

The goal is to enable precise, flexible, and efficient procedures without compromising individualization, function, or stability.
All four 5C® system variants follow a unified surgical workflow. Ergonomically and functionally designed instruments support intraoperative flexibility, enabling surgeons to adapt seamlessly to individual anatomical and procedural requirements.
A modular container system further streamlines the process by reducing the instrument set to just four trays per procedure simplifying logistics and conserving valuable resources.

  • Fewer trays, greater efficiency
    only four streamlined containers for fast and efficient handling
  • Tailored precision
    ergonomic, functional and intuitive instruments for individualized adjustment
  • Technology-driven implantation
    image-free navigation and collaborative robotics for optimal outcomes
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