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MINERVA ORTOPEDICA E TRAUMATOLOGICA
A Journal on Orthopedics and Traumatology
Minerva Ortopedica e Traumatologica 2011 April;62(2):63-73
A mobile bearing high conformity posterior-stabilized tka: four year results of the first 15 mc®
Divisione di Ortopedia e Traumatologia, Ospedale “S. Cuore di Gesù” Gallipoli, Lecce, Italia
Aim. Design is a crucial factor to consider when deciding which knee implant will improve a patient’s quality of life, restore function and reduce pain for the longest period of time. Although greater postoperative flexion is desirable, the best methods of achieving this goal remain controversial. MC²® is a mobile plate total knee arthroplasty (TKA). The mobility of the plate is exclusively rotational. The congruence is wide between 0° and 130°. The postero-stabilization cam allows the roll-back and amplitudes the intrinsic flexion.
Methods. We performed 15 TKA in the period between 2007-2010 with the MC²® (C2F, Me-difix). The mean age was 69 (max 84 minimum 59). The data collections including clinical and radiographical evaluation. The Knee Society Score (KSS) was used.
Results. The mean follow-up was 2 years (max 4 years min 6 months). At last follow-up, total flexion was 124°, the mean Knee Society Scores were 93. There was no evidence of progressive radiolucent lines. No complications associated with high conformity design, such as early aseptic loosening, were observed.
Conclusion. The use of mobile-bearing designs offers the potential of improved performance by creating knee kinematic patterns that more closely mimic those of the normal knee. As well, this design of knee replacement system offer reduced polyethylene wear due to increased implant conformity and contact area with resulting reductions in polyethylene stresses. The posterior-stabilized design allows the adequate femoral rollback due to the cam and post mechanism with the increase of the knee’s flexion. The design of MC2 incorporates all of this elements. In this small serie, mobile-bearing TKA had good clinical and radiographic results with excellent patients’ satistaction. The MC® is a good treatment option, especially in younger patients with high functional request.