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Medial Rotation Knee™

Information for Healthcare Professionals

The knee that became a philosophy

The Medial Rotation Knee™ (MRK™) is the original medial ball-and-socket knee and has been in clinical use for over 25 years. The MRK™ design was based on the principle that by providing natural functional and anatomical asymmetry in all three knee compartments (medial tibiofemoral, lateral tibiofemoral and patellofemoral articulations), better function and increased patient satisfaction can be achieved without the compromises of traditional TKRs.

The result is complete inherent stability throughout the range of motion, coupled with allowance for physiological rotation during flexion. The design also features a physiologically asymmetric patellofemoral joint for a more natural feel and ease of flexion.

When compared to all other knees, the MRK™ medial ball-and-socket knee design consistently achieves superior functional performance and excellent survivorship. Clinical data for the MRK™ shows that patients can expect:

  • Inherent full ROM stability [1-3], like the normal knee[4];
  • An excellent range of motion [1,5,6], with a device that permits over 140° flexion [1];
  • Significant health gains and improvements in function[3,5,7]; and
  • Excellent survivorship [7-9] with a device that has an ODEP 15A rating [10].

The knee that became a philosophy

MRK

Natural asymmetry

  • Anatomical and functional asymmetry
  • Physiological medial stability
  • Lateral freedom to move AP
  • Physiologically lateralised trochlea
  • Normal feeling of stability and movement

Complete stability

  • Substitutes for the ACL, PCL and meniscus
  • Inherent full ROM stability
  • No mid-flexion instability
  • Lateral stability where required
  • Patella always supported, including during deep flexion

Full mobilisation

  • Physiological rotation during flexion
  • Exhibits lateral femoral rollback
  • Femur maintained posterior to avoid impingement
  • Reduces anterior capsule tension in flexion
  • Permits 140° flexion

Designed without compromise

  • Highly conforming, low contact stress for low wear
  • No post; no box cut; avoids challenges with PCL retention
  • Tibia locking mechanism eliminates micromotion
  • Advanced instrumentation with all surgical options
  • Complete product portfolio

A pedigree with heritage and clinical data

  • The original medial ball-and-socket knee
  • Over 25 years' clinical use and ODEP 15a
  • Lowest revision rates
  • Better high-end activity
  • Greater patient-reported success and satisfaction

Latest ODEP ratings can be found at www.odep.org.uk

Resources

www.njrcentre.org.uk
MRK™ Flyer

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MRK™ Clinical Rationale

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MRK™ Brochure

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MRK™ Operative Technique

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MRK™ All Poly Operative Technique

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References

 

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