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.
- 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
- 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.
- 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.
- 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.
- 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.
- Harris W H. Wear and periprosthetic osteolysis: the problem. Clin Orthop Relat Res. 2001(393):66-70.
- 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.
- ODEP Rating: http://www.odep.org.uk/products.aspx, last access 21.01.2021.
- 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.
- Lerf R, Wuttke V, Reimelt I, Dallmann F, Delfosse D. Tribological Behaviour of the «Reverse» Inverse Shoulder Prosthesis. 7th International UHMWPE Meeting. Philadelphia 2015.
- www.affinis-inverse.com
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