RM Pressfit vitamys

monoblock cup


The RM Pressfit vitamys cup, launched onto the market in 2009, combines the advantages of the RM Pressfit cup with the good material properties of vitamys, a highly cross-linked, vitamin-E-stabilised polyethylene (HXLPE) that is highly resistant to oxidation, ageing and wear. 1, 2

The RM Pressfit vitamys cup – the first cement-free elastic monoblock cup worldwide made of HXLPE enriched with vitamin E – is the advancement of the proven RM Pressfit cup. The RM Pressfit cup achieves its primary stability through an equatorial press-fit. Aided by the flattening of the polar region, compressive forces are guided towards the periphery of the acetabular cup. 3 Additional stabilisation can be achieved as needed, using up to four screws.

The implant has an elasticity similar to bone. 4, 5, 6 Together with the special titanium particle coating on the cup surface, speedy osseointegration is sustainably supported and this allows for reliable secondary stability. 7

The properties of vitamys allow for thinner walls, which subsequently permit the use of larger articulation diameters with smaller cups: Starting with a cup size of 48mm an articulation of 32mm is possible, and starting with 50mm, an articulation of 36mm is possible. 1


  • Based on the clinical evidence of RM Classic and RM Pressfit monoblock cups 4, 8, 9, 10
  • Supplement to the RM philosophy with a vitamin-E-stabilised HXLPE vitamys
  • High resistance to wear and ageing 1, 2
  • Elasticity of the implant similar to bone in order to preserve bone over the long term 6
  • Uncemented press-fit primary fixation with additional option for screw fixation 3
  • Secondary stability is achieved through the microstructure of the titanium particle coating of the cup 7, 8, 11
  • 7A* ODEP Rating 12

1 Beck, M., et al., Oxidation Prevention with Vitamin E in a HXLPE Isoelastic Monoblock Pressfit Cup: Preliminary Results, in Total Hip Arthroplasty, K. Knahr, Editor. 2012, Springer Berlin Heidelberg. p. 21-31.

2 Lerf, R., D. Zurbrugg, and D. Delfosse, Use of vitamin E to protect cross-linked UHMWPE from oxidation. Biomaterials, 2010. 31(13): p. 3643-8.

3 Morscher et al, Development and first experience with an uncemented press-fit cup. Clin Orthop Relat Res. 1988 Jul;(232):96-103.

4 Gasser B, Biomechanical principles and studies, in Hip-Joint Surgery. The RM Cup - Long-term experience with an elastic Monobloc acetabular implant. G. Horne, Editor. 2008, Einhorn-Presse Verlag. p. 16-21.

5 Halma, J.J., et al., An uncemented iso-elastic monoblock acetabular component: preliminary results. J Arthroplasty, 2015. 30(4): p. 615-21.

6 Horne, G.D., P. A.;Dalton, D. J., Does pelvic osteolysis occur with a nonmodular uncemented acetabular component? J Arthroplasty, 2006. 21(2): p. 185-90.

7 Gasser B, Coating of the RM cup in Hip-Joint Surgery. The RM Cup - Long-term experience with an elastic Monobloc acetabular implant. G. Horne, Editor.2008, Einhorn-Presse Verlag. p. 23-30

8 Ihle et al. "The results of the titanium-coated RM acetabular component at 20 years"; JBJS (Br), 90-B, S. 1284-1290, 2008

9 Wyss, et al Five-year results of the uncemented RM pressfit cup clinical evaluation and migration measurements by EBRA. J Arthroplasty, 2013. 28(8): p. 1291-6.

10 Erivan, et al., RM Pressfit® cup: good preliminary results at 5 to 8 years follow-up for 189 patients. Hip Int, 2016.

11 Mathys R et al. The Coating of hip joint cups on their outer surface. In: Wilbert HG, Eyerer P, editors. Ultra-high molecular weight polyethylene as biomaterial in orthopaedic surgery. Toronto: Hogrefe & Huber Publishers; 1991. p. 243-7.

12 Latest ODEP reatings can be found at www.odep.org.uk

More information on the bonepreservation system can be found at www.bonepreservation.com


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