Affinis® Inverse

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Affinis® Inverse

MATHYS

Affinis® Inverse

Inverse Shoulder Prosthesis

DESCRIPTION: Affinis Inverse, evolutionary, inverse and proven.

EVOLUTIONARY: Inlay screw notching was eliminated by metaglene optimisation to a two-peg design without an inferior screw. An increased impingement-free range of motion is achieved by a systematic glenosphere overhang and chamfered inlays – with an effective humeral stem inclination of 147°.1

INVERSE: With an inversion of the materials in the tribological pairing, polyethylene abrasion at the scapular neck and the surrounding structures is eliminated.2 This results in a reduced risk of polyethylene-induced diseases.3-6

PROVEN: Proven primary procedure with more than 10 years of clinical experience and strong clinical evidence.7,8

PROGRESSIVE: In case of possible hypersensitivity to metal ions, Affinis Inverse provides a standard solution for allergy patients. The unique vitamys-ceramic tribological pairing highlights the principle for low wear9 and durable prostheses.

CLEVER: A straightforward set concept and a clever instrumentation simplify the workflow during implantation. Furthermore, all surgical steps are instrument guided, thereby reproducible results can be achieved.

Update: The Enovis and Mathys product range is now exclusively available through LimaCorporate in the UK. Osteotec remains the distributor for Enovis and Mathys customers in Ireland (Republic of Ireland and Northern Ireland) and the Nordics (Norway, Sweden, Denmark, and Finland).

  • Inversion of the materials in the sliding coupling eliminates polyethylene wear on the scapula neck10
  • No inlay screw notching thanks to two-peg design without inferior screw10
  • Reduced risk of notching thanks to effective mean stem inclination of 147°10
  • Increased impingement-free range of motion thanks to by-design eccentricity of the metaglene10
  • Good primary stability and permanent secondary stability thanks to coated pegs and compression screws with locking caps10
  • Minimised risk of disconnections thanks to snap-in mechanism between metaglene and gleno-sphere10
  • Minimised risk of infection or disconnection thanks to monolithic stems10
  1. de Wilde L F, Poncet D, Middernacht B, Ekelund A. Prosthetic overhang is the most effective way to prevent scapular conflict in a reverse total shoulder prosthesis. Acta Orthop. 2010;81(6):719-26.
  2. Kohut G, Dallmann F, Irlenbusch U. Wear-induced loss of mass in reversed total shoulder arthroplasty with conventional and inverted bearing materials. J Biomech. 2012;45(3):469-73.
  3. Alexander J J, Bell S N, Coghlan J, Lerf R, Dallmann F. The effect of vitamin E-enhanced cross-linked polyethylene on wear in shoulder arthroplasty-a wear simulator study. J Shoulder Elbow Surg. 2019.
  4. Boileau P, Moineau G, Morin-Salvo N, Avidor C, Godeneche A, Levigne C, Baba M, Walch G. Metal-backed glenoid implant with polyethylene insert is not a viable long-term therapeutic option. J Shoulder Elbow Surg. 2015;24(10):1534-43.
  5. Harris W H. Wear and periprosthetic osteolysis: the problem. Clin Orthop Relat Res. 2001(393):66-70.
  6. Huang C H, Lu Y C, Chang T K, Hsiao I L, Su Y C, Yeh S T, Fang H W, Huang C H. In vivo biological response to highly cross-linked and vitamin e-doped polyethylene – a particle-Induced osteolysis animal study. J Biomed Mater Res B Appl Biomater. 2016;104(3):561-7.
  7. ODEP Rating: http://www.odep.org.uk/products.aspx, last access 21.01.2021.
  8. Irlenbusch U, Kaab M, Kohut G, Proust J, Reuther F, Joudet T. Reversed shoulder arthroplasty with inversed bearing materials: 2-year clinical and radiographic results in 101 patients. Arch Orthop Trauma Surg. 2015;135(2):161-9.
  9. Lerf R, Wuttke V, Reimelt I, Dallmann F, Delfosse D. Tribological Behaviour of the «Reverse» Inverse Shoulder Prosthesis. 7th International UHMWPE Meeting. Philadelphia 2015.
  10. www.affinis-inverse.com

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