4-motion® Knee Joint

4-motion Knee system

4-motion® Knee Joint

With the development of the 4-motion® knee joint, we are following the consistent path of reconstructing the anatomical planes of movement in the knee joint. On average, the joint plane drops about 3° medially and about 3-7° posteriorly. The reconstruction of this anatomical specification brings about numerous changes in the prosthesis design and advantages in the context of prosthesis implantation. Femorally, the posterior offset can be reconstructed, since the operation-related external rotation of the femoral component is no longer necessary with this anatomical design. The condylar radii of the medial and lateral side have different radii of curvature according to the anatomical specifications. The need for ligamentary releases is significantly reduced by the anatomically variable position that can be set between 87° and 90°.

 

The “image to instrument” procedure used for the implantation of the 4-motion® knee joint allows customised knee endoprosthetic treatment.

Advantages

 

This concept combines various functions and offers many advantages for both surgeons and patients:

  • 3-dimensional reconstruction of the knee to be operated
  • Interactive 3D web planning, preoperative optimization of component placement
  • Precise positioning of the implant
  • No opening of the Markkanal necessary
  • Reduction of surgical steps and operation time
  • Reduction of time and costs for washing, assembly and sterilization processes

The instruments manufactured on this basis are precisely adapted to the individual surface contour and anatomy of the respective knee joint.

Product features

 

Femoral component

 

  • Anatomical joint line and reconstruction of the dorsal offset
  • Q angle of 9°
  • widened patella inlet
  • Different radii of curvature medial and lateral
  • 10 sizes allow fine tuning

 

Tibia component 87°

 

  • For preoperative MPTA angles of approx. 87
  • Stem anatomically offset medially
  • asymmetrical support
  • Extension option
  • 3° to medially inclined joint plane
  • 4° dorsal slope in the stem
  • 10 sizes – fine tuning

 

Tibial component PSA (Patient Specific Alignment)

 

  • Round keel allows free placement in MPTA angle from 87° to 90°
  • Homogeneous force application independent of the selected MPTA angle
  • asymmetrical support
  • Anatomical reconstruction of dorsal slope in the range of 3° – 6
  • 10 sizes – fine tuning
  • Material Ti6Al4V – no allergy variant necessary for this tibia

Inlays

 

  • XLPE with vitamin E (VEX)
  • Standard PE

Allergy variant

 

  • TiNbN version for allergic sensitive patients
  • Not required for PSA Tibia

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4-motion® Knee joint
Patient information

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4-motion® Knee joint
Fact sheet