Metha® Short Hip Stem

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Evolving the State of Arthroplasty

The Metha Short Hip Stem prosthesis represents a new generation of implants for hip endoprosthesis. It combines two advantages: minimal stem size and a circumferential coating. The implant design enables minimally invasive procedures.

The design continues on the positive experience with non-cemented stems fixated by metaphyseal anchoring. The prosthesis concept allows implantation via the base of the femoral neck, with conservative treatment of the bone in the femoral neck and in the greater trochanter region, preserving the bone, soft tissue and muscle.

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The three CCD angle specifications of 135°, 130° and 120° of the Metha® system provide a variety of offset options for the stem implantation. The varus-valgus variability of the Metha® Stem position of approximately 20° allows further optimization of the patient-specific hip joint reconstruction.

Metha® features the proximal rough Plasmapore® titanium microporous coating for cementless implantation. An additional 20 μ-m calcium phosphate layer is applied electrochemically. This thin layer has an osteoconductive effect and accelerates contract between the bone and the prosthesis stem.

The higher osteotomy and the more medical location of the femoral access make Metha® ideally siuted for minimally invasive implantation techniques. The instrument range has been carefully and specially designed for such procedures and provides excellent support for the most common hip approaches.
In the supine position, the antero-lateral, the direct lateral and the direct anterior approach are possible. In lateral position, the direct lateral, the antero-lateral and the posterior approach.

Literature

Schmidutz, Florian; Steinbrück, Arnd; Wanke-Jellinek, Lorenz; Pietschmann, Matthias; Jansson, Volkmar; Fottner, Andreas (2012b): The accuracy of digital templating: a comparison of short-stem total hip arthroplasty and conventional total hip arthroplasty. In: International orthopaedics 36 (9), S. 1767-1772. DOI: 10.1007/s00264-012-1532-7.

Schnurr, Christoph; Schellen, Bernd; Dargel, Jens; Beckmann, Johannes; Eysel, Peer; Steffen, Reinhard (2017): Low Short-Stem Revision Rates: 1-11 Year Results From 1888 Total Hip Arthroplasties. In: The Journal of arthroplasty 32 (2), S. 487-493. DOI: 10.1016/j.arth.2016.08.009.

Floerkemeier, Thilo; Schwarze, Michael; Hurschler, Christof; Gronewold, Jens; Windhagen, Henning; Lewinski, Gabriela von; Budde, Stefan (2017): The Influence of Tribological Pairings and Other Factors on Migration Patterns of Short Stems in Total Hip Arthroplasty. In: BioMed research international 2017, S. 8756432. DOI: 10.1155/2017/8756432.

Hayashi, Shinya; Hashimoto, Shingo; Kanzaki, Noriyuki; Kuroda, Ryosuke; Kurosaka, Masahiro (2016): Daily activity and initial bone mineral density are associated with periprosthetic bone mineral density after total hip arthroplasty. In: Hip international: the journal of clinical and experimental research on hip pathology and therapy 26 (2), S. 169-174. DOI: 10.5301/hipint.5000320.

Lerch, Matthias; Kurtz, Agnes; Stukenborg-Colsman, Christina; Nolte, Ingo; Weigel, Nelly; Bouguecha, Anas; Behrens, Bernd A. (2012): Bone remodeling after total hip arthroplasty with a short stemmed metaphyseal loading implant: finite element analysis validated by a prospective DEXA investigation. In: Journal of orthopaedic research: official publication of the Orthopaedic Research Society 30 (11), S. 1822-1829. DOI: 10.1002/jor.22120.

Yan, Shuang G.; Woiczinski, Matthias; Schmidutz, Tobias F.; Weber, Patrick; Paulus, Alexander C.; Steinbrück, Arnd et al. (2017): Can the metaphyseal anchored Metha short stem safely be revised with a standard CLS stem? A biomechanical analysis. In: International orthopaedics 41 (12), S. 2471-2477. DOI: 10.1007/s00264-017-3497-z. (Short stem hip arthroplasty provides a more physiological load transfer: a comparative finite element analysis study 2020; Budde et al. 2016; Floerkemeier et al. 2017; Hayashi et al. 2016; Lerch et al. 2012; Schmidutz et al. 2012b; Schmidutz et al. 2012a; Schnurr et al. 2017; Yan et al. 2017).

Budde, Stefan; Floerkemeier, Thilo; Thorey, Fritz; Ezechieli, Marco; Claassen, Leif; Ettinger, Max et al. (2016): A short-stem hip implant with metaphyseal anchorage in patients with developmental dysplasia of the hip. In: Technology and health care: official journal of the European Society for Engineering and Medicine. DOI: 10.3233/THC-161151.

Schmidutz, Florian; Grote, Stefan; Pietschmann, Matthias; Weber, Patrick; Mazoochian, Farhad; Fottner, Andreas; Jansson, Volkmar (2012a): Sports activity after short-stem hip arthroplasty. In: The American journal of sports medicine 40 (2), S. 425-432. DOI: 10.1177/0363546511424386.