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Luigi Zagra

evaluated when considering the cause of failure of a THA. 36 Retrieval studies show that “by using a ceramic head, CoCr fretting and corrosion from the modular head-neck taper may be mitigated although not completely eliminated” 37 and metal

Didier Hannouche, Matthieu Zingg, Hermes Miozzari, Remy Nizard, and Anne Lübbeke

Year Type of ceramic Head diameter Comments 1971 Al 32 Non-modular ceramic heads/ cemented or impacted plain Al acetabular component 1973 Al 28,32 Modular ceramic heads 1977 Al 28,32 Modular ceramic heads

Carlos A. Encinas-Ullán, Primitivo Gómez-Cardero, Juan S. Ruiz-Pérez, and E. Carlos Rodríguez-Merchán

mechanics of movement and diminished stress transmission, although suboptimal instrumentation and implant design led to high complication rates. Third-generation RH-TKA modular systems evolved further, incorporating modular stems and diaphyseal anchorage

M M Morlock, E Gomez-Barrena, D C Wirtz, A Hart, and J P Kretzer

. 2 ), dual-taper modular primary hip stems ( 9 , 10 ) ( Fig. 3 ) or titanium alloys with reduced material stiffness ( 11 ) worked well clinically as long as they were used in the inventor’s hands but showed insufficient robustness for the wider use

Keith Tucker, Klaus-Peter Günther, Per Kjaersgaard-Andersen, Jörg Lützner, Jan Philippe Kretzer, Rob G.H.H. Nelissen, Toni Lange, and Luigi Zagra

, especially in modular hip revisions stems, that elevated mechanical load on the components can lead to fracture of the taper connection. Other causes of mechanical failure (i.e. high offset, short proximal component, lack of adequate medial bone supporting

Giorgio Perino, Ivan De Martino, Lingxin Zhang, Zhidao Xia, Jiri Gallo, Shonali Natu, David Langton, Monika Huber, Anastasia Rakow, Janosch Schoon, Enrique Gomez-Barrena, and Veit Krenn

various head/neck junctions and CoCr dual modular neck (DMN), in two types coupled with a TMZF (Ti, Mo, Zr, Fe) stem. 20 , 23 – 29 This body of work for hip implants can also be applied to all other joint replacements with metallic junctions. The

Maria A. Smolle, Dimosthenis Andreou, Per-Ulf Tunn, and Andreas Leithner

hip/proximal femur – pelvic defect reconstructed by modular hemipelvic endoprosthesis, proximal femur reconstructed by using custom-made or modular prox. femoral endoprosthesis – one patient died perioperatively, the other 17 patients were followed

Julie J. Willeumier, Yvette M. van der Linden, Michiel A.J. van de Sande, and P.D. Sander Dijkstra

-acetabular modular prosthesis; IMN = antegrade placed intramedullary nail (reconstruction type); PF-MTP = proximal femur modular tumour prosthesis; DF-MTP = distal femur modular tumour prosthesis; SG = segmental prosthesis. Table 3

Christiaan P. van Lingen, Luigi M. Zagra, Harmen B. Ettema, and Cees C. Verheyen

to several apparent advantages: preservation and conservation of bone stock on the femoral side (but not the acetabular side); 16 - 20 easier replication of biomechanics and limb length; and the absence of modular components with a taper

Mattia Loppini and Guido Grappiolo

and the mean rate of stress shielding was 26.9% (5.2% to 66%) in 556 hips. 16 , 22 , 26 , 28 , 31 Metaphyseal total hip arthroplasty (METHA) The METHA (Aesculap) is an uncemented neck-retaining monoblock or modular stem ( Fig. 2 ). It is