RM Pressfit vitamys

monoblock cup

Description

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

Benefit

  • 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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