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The Clinical Performance of UHMWPE in Hip Replacements

the elderly population (ages 65 years and older) receiving a hip or knee replacement is expected to increase by 101% over the next 30 years, whereas the population of young patients (yoimger than 65 years) is projected to increase [Pg.71]

Age distribution receiving a primary hip or knee replacement in 2000, along with the projections for 2030 calculated by the AAOS. [Pg.72]

Projected growth of primary hip and knee procedures in the United States over the next 30 years. [Pg.72]


The story of UHMWPE in orthopedics, seemingly immutable and static, still continues to evolve. Early in 2002, 1 imdertook the task of expanding my website, the UHMWPE Lexicon (www.uhmwpe.org), with an online monograph of six introductory chapters covering the basic scientific principles and clinical performance of UHMWPE in hip replacement. The response to these online chapters was overwhelmingly positive and encouraged me to revise the first six chapters for hardcopy publication and to develop the additional nine chapters for the UHMWPE Handbook. [Pg.395]

Although knee arthroplasty enjoys a remarkable clinical track record, problems with wear and fatigue damage of UHMWPE continue to limit the longevity of both unicondylar and bicondylar knee replacement components. Unlike in the hip, where radiographic techniques have been developed to quantify in vivo wear rates, there currently exist no standard and widely accepted techniques for tracking the clinical performance of UHMWPE in patients with knee replacement. Thus, today the most effective way to evaluate the in vivo performance of UHMWPE continues to be the analysis of retrieved components from revision surgery or from autopsy donations. [Pg.153]

This chapter contains four main sections covering TKA and, where applicable, UKA. The first section reviews the biomechanical considerations of knee arthroplasty that distinguish it from hip replacement. The second section describes the survivorship of TKA and UKA, and outlines measures of clinical performance for UHMWPE in knee arthroplasty. The third section is devoted to wear and osteolysis in TKA. In the final section of this chapter, alternatives to metal-on-conventional UHMWPE articulation for knee arttiroplasty are described. [Pg.153]

It is important to distinguish between mechanical behavior and clinical performance. Although one may conceptualize different regimes of UHMWPE mechanical behavior based on their oxidation index, the association between oxidation, mechanical behavior, and clinical performance is not straightforward. The clinical significance of in vivo oxidation in the hip and knee is further explored in the following sections. Additional details about in vivo oxidation in artificial disc replacements can be found in Chapter 12. [Pg.331]

First, despite their recent clinical introduction, highly crosslinked and thermally treated UHMWPE materials are now used in the majority of hip replacements in the United States. During 2003, highly crosslinked UHMWPE materials are projected to be used in an estimated 65% of U.S. hip arthroplasties (Table 15.7). Crossfire, Marathon, and Longevity have the greatest market share in the United States, and these three materials alone are estimated to accoimt for 55% of hip replacements performed in 2003. [Pg.354]


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