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Affinis Inverse

Inverse Shoulder Prosthesis

Inversion of the materials in the sliding coupling eliminates polyethylene wear on the scapula neck [10]

No inlay screw notching thanks to two-peg design without inferior screw [10]

Reduced risk of notching thanks to effective mean stem inclination of 147° [10]

About

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

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 Moreover, 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 wear 9 and durable prostheses.

Affinis Inverse provides a proven primary procedure with more than 10 years of clinical experience and strong clinical evidence. 7,8

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.

Increased impingement-free range of motion thanks to by-design eccentricity of the metaglene 10
Good primary stability and permanent secondary stability thanks to coated pegs and compression screws with locking caps 10
Minimised risk of disconnections thanks to snap-in mechanism between metaglene and gleno-sphere 10
Minimised risk of infection or disconnection thanks to monolithic stems 10

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.