Minimize Complexity,
Maximize Versatility
The entire GMK Total Knee Replacement System has been designed to preserve the joint functionality without dramatically altering its anatomy and kinematics, even in cases of severe ligament instability or massive bone defects.
Thanks to the GMK Revision comprehensive range of options the surgeon can choose the most suitable solution for every patient within his care without any compromise.
The established GMK REVISION implant, along with the easy to use instrumentation, help the surgeon to operate every day in total confidence, flawlessly addressing each surgical scenario, from primary augmentable cases to the most challenging knee revisions: with GMK REVISION any challenge is possible!
GMK Revision is also available with SensiTiN, a ceramic-like coating designed to reduce the release of metal ions from the implant.
The GMK Revision product range, including mobile and fixed bearings, offers different levels of constraint:
6 sizes
Anatomical: left and right
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented
6 sizes
Anatomical: left and right
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4) + SensiTiN coating
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6 sizes
Anatomical: left and right
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4) + SensiTiN coating
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6 sizes
Anatomical: left and right
Material: Cobalt-Chrome (Co-Cr-Mo ISO 5832-4)
Cemented
Symmetric, deep dish
Anterior flare to accommodate patellar tendon
6 sizes
Five levels of thickness (10, 12 ,14, 17, 20 mm)
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Symmetric
Anterior flare to accommodate patellar tendon
6 sizes
Five levels of thickness (10, 12 ,14, 17, 20 mm)
Additional fixation screw
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Symmetric
Anterior flare to accommodate patellar tendon
6 sizes
Seven levels of thickness (10, 12 ,14, 17, 20, 23, 26 mm)
Additional fixation screw
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Symmetric
Anterior flare to accommodate patellar tendon
6 sizes
Five levels of thickness (10, 12 ,14, 17, 20 mm)
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Symmetric, deep dish
Anterior flare to accommodate patellar tendon
6 sizes
Five levels of thickness (10, 12 ,14, 17, 20 mm)
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Interchangeable femur / tibia
2 offset: 3 , 5 mm
Titanium alloy (Ti6Al4V, ISO 5832-3)
Interchangeable femur / tibia
Diameter = 10,11,12,13,14,15,16,18,20,22 mm
Length = 65, 105, 150 mm
Titanium alloy (Ti6Al4V, ISO 5832-3)
Interchangeable femur / tibia
Tapered shape
Diameter = 11, 13, 16 mm
Length = 65, 105 mm
Titanium alloy (Ti6Al4V, ISO 5832-3)
Mechanically attached to femoral component (screw included)
Interchangeable medial / lateral side
Five levels of thickness: 4, 8, 12, 16, 20 mm
High nitrogen Stainless steel (M30NW, ISO 5832-9) and Titanium alloy screw (Ti6Al4V, ISO 5832-3)
Mechanically attached to femoral component (screw included)
Interchangeable medial / lateral side
Two levels of thickness: 5, 10 mm
High nitrogen Stainless steel (M30NW, ISO 5832-9) and Titanium alloy screw (Ti6Al4V, ISO 5832-3)
Mechanically attached to femoral component (screws included)
Interchangeable medial / lateral side
Four levels of thickness: 5, 10, 15, 20 mm
High nitrogen Stainless steel (M30NW, ISO 5832-9) and Titanium alloy screw (Ti6Al4V, ISO 5832-3)
Anatomical shape
4 sizes
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Cemented
Three fixation pegs
Round shape
3 sizes
Machined Ultra High Molecular Weight Polyethylene (UHMWPE ISO 5834-2)
Cemented
One central fixation peg
The femoral box is reduced to a minimum, saving precious bone stock.
MECHANICAL PROPERTIES
The internal reinforcement metal peg provides resistance and safety. Mechanical tests show proven stability and mechanical resistance of GMK REVISION semi-constrained 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.
Both for mobile and fixed bearing, the internal surface of the tibial baseplate is mirror polished, minimising the risk of backside wear.
The keel dimensions are the same as for GMK PRIMARY, allowing for the use of a modular offset.
Cemented augments are available to fill bone defects and manage the joint line position.
Interchangeable modular offset adapters are available for femur and tibia in order to provide the maximum flexibility with the minimum inventory, avoiding the need for additional offseted stems.
All the modular connections are accurately tested* and dedicated instruments are available in the operating room to ensure a reproducible fixation and providing the maximum safety for the patient.
*Data on file: Medacta
Due to different clinical indications, both cementless and cemented options are available. Cementless stems have longitudinal splines to provide rotational stability, whereas cemented stems have longitudinal pockets for cement and fluted shape to facilitate insertion.
ADD EASY-TO-USE AND SAFE INSTRUMENTATION TO A VERSATILE RANGE OF PRODUCT: THE RESULT IS GMK REVISION
The primary goal of a GMK Revision knee replacement includes the restoration of anatomical alignment and functional stability, the accurate re-establishment of the joint line and the fixation and stabilisation of the revision prosthetic implant components.
The GMK Revision has flexible instrumentation which allows different surgical techniques to be performed, depending on the surgeon's preferences and the clinical circumstances. The surgeon can therefore proceed with complete confidence even in the most challenging situation.
Dedicated instruments are provided to accurately reproduce the validated offset on femur and tibia. All the modular connections are then secured by Morse taper, additional screw, dynamometric wrenches and special impactors which always ensure a standardised and reproducible procedure.
Tibial and femoral resections can be accurately fine-tuned thanks to micrometric systems, in order to preserve as much bone as possible and ensuring an optimal joint line management.
Multiple checks at different operative stages allows the management of the joint line position in order to restore the best functionality of the extensor mechanism. Patellar tracking can be adjusted up to the femoral trialing step as femoral augment resections can be performed directly through the trial femur.
The instruments provided easily allow the surgeon to switch, intra-operatively, from a less constrained to a more constrained inlay when more stability is required, without the need for any additional instrumentation.
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
Same internal and articular femoral profiles between GMK REVISION and GMK PRIMARY ensure the freedom to choose intra-operatively the most suitable constraint for the patient, even after the bone cuts have been performed.
In addition, the wide compatibility of the primary polyethylene inlay and using the same primary tibial component results in less inventory for the hospital.
Design rationale
Leaflet
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