RM Pressfit – Cementless monoblock press-fit cup
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Discover the 3 dimensions of the RM Pressfit Cup
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Dimension 1: The Design
The RM Pressfit Cups continue to carry on the successful concepts of elasticity and of particle coating used in the isoelastic RM Classic cup. With a mean survival rate of 94.4 % after 20 years1 the RM Classic Cup ranks among the most successful acetabular cups in the world.
PressfitThe over sizing at the cup’s equator ensures an optimal primary press-fit fixation of the implant in the acetabulum. This minimizes the movement between implant and bone providing optimal physiological conditions for the osseointegration of the implant. The combination of an optimal primary stability, minimized movement and osseointegration provides the mechanism for the secondary fixation.
Optimal primary stability and a reliable secondary stabilisation.
If desired, special screws are available to optimise the primary stability. |
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Elliptical design with flattened pole
The elliptical design and the slight polar flattening permit a secure placement of the cup into the acetabulum. The flattened pole prevents a force transmission to the thinnest point of the acetabulum.
Instruments
- Only a few instruments and operating steps are required to implant the RM Pressfit cup.
- The RM Pressfit cup is also perfectly suitable for minimal invasive surgery using special designed MIS instruments.
- Straight forward surgical technique with user-friendly instruments.
Dimension 2: The science behind
ElasticityThe RM Pressfit Cup is a monoblock implant made of ultra high molecular weight polyethylene (UHMW-PE) or vitamin E stabilized highly cross linked polyethylene (vitamys®). The elasticity modulus of the material (1'000 N/mm2 for UHMW-PE and 800 N/mm2 for vitamys®) is very similar to the characteristics of bone structure. RM Pressfit cups are therefore able to adapt to the micro deformation of the pelvis leading to optimal osseointegration and load transfer between implant and bone. |
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Large stock of polyethyleneThe monoblock design of the RM Pressfit cup offers an extraordinary high polyethylene thickness leading to very low contact stresses. The result: low wear rates and a long lasting implant. |
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Titanium coatingSingle pure titanium particles (TiCP) are anchored in the polyethylene surface with no bond to each other. A number of studies1, 2, showed the advantages of this technology. The coating is clinically well proven in the RM Classic cup and offers improved biocompatibility resulting in a direct contact with bone.
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Dimension 3: The variety of articulationsvitamys® vitamys® is the patented vitamin E stabilized highly cross linked polyethylene (HXLPE) – the newest innovation of Mathys. Thus the wear resistance and the mechanical qualities are improved. The technology of vitamys® offers a wear resistant HXLPE articulation also for bigger head diameters (36 mm). In combination with ceramys® – our alumina toughened zirconia ceramic head – the RM Pressfit vitamys® cup is a more forgiving alternative to hard/hard bearings also for young and active patients.
vitamys® – available in size 28 mm, 32 mm and 36 mm. |
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Ultra high molecular weight polyethylene (UHMW-PE)This RM Pressfit cup is made of UHMW-PE with excellent long term results.
UHMW-PE – available in size 28 mm and 32 mm. |
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1 M. Ihle et al.
«The results of the titanium-coated RM acetabular component at 20 years»;
JBJS (Br), 90-B, pp 1284-1290, 2008.
2 G. Horne.
«Hip Joint Surgery. The RM Cup – Long-term experience with an elastic monobloc acetabular implant»;
Einhorn Presseverlag, 2008.
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.