RM Classic Cup - A success history:
more than 270'000 have been implanted over the last 35 years!
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 click to enlarge |
Since its market introduction this unique cup has proven its clinical reliability in more than 270'000 implantations all over the world. Slight modifications in design and additional outer coating and articulation options have enhanced the use of this philosophy in the last years.
Published and ongoing clinical follow-up results prove its effectiveness and its excellent survival rate
(94,4% after 20 years1).
1 Ihle M., Mai S., Pfluger D. H., Siebert W.; The results of the titanium-coated RM acetabular component at 20 years. A long-term follow-up of an uncemented primary total hip replacement, JBJS (Br) 2008; 90-B: 1284-1290
The concept
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Magnification of the pure titanium particle coating - click to enlarge |
The RM Classic Cup is an uncemented, acetabular monoblock cup made of UHMW-PE, available with two different coatings:
 | Coating of pure titanium powder (TiCP according to ISO 5832-2) |
| Coating of HA granules (according to ASTM F 1185) |
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 Metal-metal articulation (metamys) |
Furthermore, the TiCP cup is also available with a metal-on-metal (metamys) articulation.
Different designs, from full profile and bevelled to revision versions, cover a wide range of indications and patient requirements.
The primary stability of the acetabular cups relies on the press-fit effect produced when the two pegs on the cup are driven into the slightly displaced peg holes in the acetabulum. (The two peg holes drilled with the drill guide are placed at 30° to the cup's centreline, but the pegs on the cup are located at 25°.)
The two pegs position the cup and stabilise it against the rotational forces. If required, additional screws may be inserted to enhance the primary stability.
The RM Classic Cup allows a very harmonious load transfer from the bone to the implant, because of the low and well-adapted modulus of elasticity of the cup's material. The risk of a fibrous tissue interposition is minimal and the different coating options promote osseointegration.
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Full profile cup
This cup is particularly suited for deep acetabula in primary interventions and in revision cases. The slope of 45 degrees guarantees the anatomically correct positioning of the cup. The full profile cup is available in external diameters of 50 to 60mm in 2mm increments for 32mm articulations.
Bevelled cup
The inclination of 30° increases the contact surface between head and cup by 23%, assures an improved pressure distribution on the polyethylene and reduces the luxation risk.
The bevelled cup is available in external diameters of 46 to 62mm in 2mm increments for 28mm articulations and 50 to 68mm for 32mm articulations.
Bevelled metal-metal (metamys) cup
Due to its highly wear-resistant articulation, the metal-metal (metamys) cup is the ideal choice for active patients. This cup should only be used with Mathys metal-metal (metamys) total hip-prosthesis heads.
The bevelled metal-metal (metamys) cup is available in external diameters of 46 to 64mm in 2mm increments for 28mm articulations.
Revision cup
The revision cup is appropriate for primary operations with extensive bone defects and revision cases. Cancellous bone screws can be used to further improve fixation of the cup.
The revision cup is available in external diameters of 60 to 68mm in 2mm increments for 32mm articulations.
Indications
The use of the RM Classic Cup is indicated in all cases in which the quality and morphology of the bone ensure a safe and lasting primary mechanical stability.
Possible indications may be:
| Primary implantations in case of hip arthrosis |
| Dysplasic coxarthroses |
| Posttraumatic coxarthroses |
| Revisions with slight bone loss |
Reference hospitals with scientific studies
- Prof. Dr Siebert
Orthopaedic clinic
Kassel, Germany - Dr John
University Charité
Campus Benjamin Franklin
Berlin, Germany - Prof. Dr Horne
School of Medicine, Department of Surgery
Wellington, New Zealand
Literature
Other innovative products
Our company has several other innovated products which are not
published on this website. Please refer to your Mathys contact person
for further information.