Website Logo: MatOrtho

MatOrtho Limited
T +44 (0)1372 224200
F +44 (0)1372 366343

Medial Rotation Knee
Medical Professionals

Latest Developments


06 October 2016 | The London Knee Meeting brings together renowned national and international faculty each year to present an up...
read more

12 September 2016 | We are very pleased to announce that Mike Tuke has been awarded a Fellowship by the Royal Academy of Engineeri...
read more




Medial Rotation KneeTM

The Medial Rotation Knee™ (MRK™) is the original medial ball-and-socket knee and has been in clinical use for over 20 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 10A rating [10].

    ODEP 10A Hires

    The knee that became a philosophy


Medial Rotation Knee


  1. Moonot P, Mu S, Railton GT, Field RE, Banks SA. Tibiofemoral kinematic analysis of knee flexion for a medial pivot knee. Knee Surg Sports Traumatol Arthrosc. 2009; 17(8):927-34.
  2. Molloy D, Jenabzadeh R, Walter W and Hasted T. Sagittal Stability in Three Different Knee Designs. A Single Centre Independent Review. Bone Joint J 2013; 95-B SUPP 15 85 (presented ISTA 2012; The Great Debate 2013)
  3. Jonas SC, Argyropoulos M, Al-Hadithy N, Korycki M, Lotz B, Deo SD, Satish V. Knee arthroplasty with a medial rotating total knee replacement. Midterm clinical findings: A district general experience of 38 cases. The Knee. 2015; 22(2): 122-125.
  4. Johal P, Williams A, Wragg P, Hunt D, Gedroyc W. Tibio-femoral movement in the living knee. A study of weight bearing and non-weight bearing knee kinematics using ‘interventional’ MRI. J Biomech. 2005; 38(2):269-76.
  5. Hossain F, Patel S, Rhee SJ, Haddad FS. Knee arthroplasty with a medially conforming ball-and-socket tibiofemoral articulation provides better function. Clin Orthop Relat Res. 2011; 469(1):55-63
  6. Kooijman CM and van Stralen GMJ. Having the confidence to change for a more stable future. June 2013. Presented at The Great Debate, London.
  7. National Joint Registry. Implant Summary Report, August 2016. Ref: Summary.Report.KP_Femoral_MRK.15/08/2016.20:41 (held by MatOrtho Ltd.)
  8. National Joint Registry. 13th Annual Report, 2016:
  9. Mannan K and Scott G. The Medial Rotation total knee replacement: a clinical and radiological review at a mean follow-up of six years. J Bone Joint Surg Br. 2009; 91(6):750-6.
  10. Orthopaedic Data Evaluation Panel (ODEP). Latest ODEP ratings can be found at





Company registered in England. MatOrtho Limited
Company No. 07323441 | VAT No: GB 104 6192 42

Registered Offices:
MatOrtho Limited, 13 Mole Business Park, Randalls Road, Leatherhead, Surrey,
United Kingdom, KT22 7BA