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MINIMALLY INVASIVE, MAXIMUM PERFORMANCE
The GMK UNI has been conceived to be soft tissue friendly. Both implant and instrumentation are designed to fit muscle sparing surgical approaches.
Nonetheless, as the other members of the GMK Family, the GMK UNI offers a complete product range, including mobile and fixed bearing metal back plus fixed bearing full poly versions, to fit different surgeon’s preferences and patient’s conditions.

  1. Bone preserving femoral component: the thickness of distal and posterior condyles is always 6mm, independently form the size being implanted
  2. Same femoral resections for all sizes allow freedom to choose the optimal femoral size up to the latest steps of the surgical procedure
  3. Flared distal footprint accommodates femoral rotation without impinging on the patella
  4. Muscle sparing-friendly femoral pegs do not require hyper flexion to implant the femoral component
  5. The stabilization fin and the oblique fixation peg of the mobile and fixed metal back tibial baseplate ensure optimal primary fixation and ease implant positioning thanks to their muscle sparing-friendly design

FEMORAL COMPONENT

4 sizes
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented

FIXED TIBIAL TRAY

5 Right Medial / Left Lateral sizes
5 Left Medial / Right Lateral sizes
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented

MOBILE TIBIAL TRAY

5 Right Medial / Left Lateral sizes
5 Left Medial / Right Lateral sizes
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented

MOBILE INSERT

4 sizes
Seven levels of thickness: 6, 7, 8, 9, 10, 11, 12 mm

FULL POLY TIBIAL TRAY

5 Right Medial / Left Lateral sizes
5 Left Medial / Right Lateral sizes
Six levels of thickness: 8, 9, 10, 11, 12 and 14 mm
Cemented

FEMORAL COMPONENT

Unique internal shape, compatible with all sizes and incorporating the same position for the posterior peg, allows the choice of femoral size right up until the final step of the surgical procedure.

METAL BACK FIXED BEARING VERSION

Round-on-flat articulation avoids unwanted stresses on the tibial compartment.
The mirror polished fixed tibial baseplate minimises backside wear on the polyethylene inlay.

MOBILE BEARING VERSION

Full coronal congruency both in flexion and extension between femoral component and polyethylene inlay allows rotational adjustment of the femoral component without compromising the stability and the congruency of the implant.
The mirror polished mobile tibial baseplate minimises backside wear on the polyethylene inlay.

POLYETHYLENE

Published papers show that polyethylene that does not undergo any irradiation or thermal treatments, that may affect mechanical properties, may show reduced potential of delamination[1]. Medacta provides machined, non-irradiated polyethylene for all GMK tibial inserts.

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MINIMALLY INVASIVE, MAXIMUM PERFORMANCE

The GMK UNI instruments have been designed to enable the surgeon to perform a safe and reproducible implantation using a muscle sparing surgical technique, without dislocating the patella.

The GMK UNI cutting blocks are designed with round and soft tissue-friendly profiles to suit limited exposure and patella-in-place procedures.

Fill the gap Instrumentation: accurately managing soft tissues and ligaments, flexion and extension gaps are seamlessly translated into femoral resection levels.

Only 2 trays: the GMK UNI instruments are organized in a very compact layout.

DESIGN RATIONALE
[1] Ries M D, “Highly Cross-Linked Polyethylene. The Debate is Over-In Opposition”, The Journal of Arthroplasty, 20:59-62, 2005.
[2] Kondo et al. “Arthroscopy for evaluation of polyethylene wear after total knee arthroplasty”, J Orthop Sci, 13:433-437, 2008. Orthop Sci, 13:433-437, 2008
[3] Baker et al., “The effects of degree of Crosslinking on the fatigue crack initiation and propagation resistane of orthopedic-grade polyethylene”, J Biomed Mater Res A, 66(1):146-54, 2002.
[4] Muratoglu et al., “Unified wear model for highly crosslinked ultra-high molecular weight polyethylenes (UHMWPE)”, Biomaterials, 20:1463-70, 1999.
[5] Polyethylene in TKA: Do we really need cross-linked polyethylene?, MORE Journal Vol. 1 May 2011

CLINICAL FOLLOW UP
[6] J-L. Meystre, J-P. Canciani, F. Chalencon, R. Mendelin,  Unicompartmental knee arthroplasty: is it possible to make it more reliable?, KSSTA Journal – paper under submission

EXPERIENCE THE SYNERGY BETWEEN THE GMK UNI AND MYKNEE
Medacta offers you the opportunity to experience an anatomic unicondylar knee replacement system with the enhanced accuracy and proven efficiency of a system specifically designed for each individual patient: the synergy between GMK UNI and MyKnee UNI.

 

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