title: Dual poly liner mobility optimizes wear and stability in THA: affirms.
abstract: A dual-mobility acetabular component consists of a large, fixed, porous-coated acetabular component and a bipolar femoral component. These components are often called tripolar components. This configuration provides a stable, well-fixed implant platform against bone and 2 articular interfaces, a large polyethylene surface directly apposed to a highly polished metal implant, and a standard-sized (28- or 32-mm) femoral head captured within polyethylene. The dual-mobility cup appears to offer a safe, effective, durable solution to hip instability. The concept has extensive laboratory and clinical support. Although the long-term durability of these implants is unknown, the tested wear rates of a dual-mobility design with the current generation of highly cross-linked polyethylene are significantly lower than any previously reported wear rates. The recently introduced modular dual-mobility shell offers surgeons substantial flexibility in addressing the issue of hip instability with a cost-efficient, familiar option.
authors: Northwestern University, 680 N Lake Shore Dr, Ste 1028, Chicago, IL 60611, USA. jointsurg@northwestern.edu
authors: S David
authors: SD
authors: Stulberg
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D020099:Coated Materials, Biocompatible; D006617:Hip Dislocation / Q000000981:diagnostic imaging / Q000517:prevention & control*; D006622:Hip Prosthesis; D007593:Joint Instability / Q000000981:diagnostic imaging / Q000517:prevention & control*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D013997:Time Factors
chemical_list: D020099:Coated Materials, Biocompatible