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Hydroxyapatite Coated (HAC) Femoral Component.

For years, custom hip prosthesis cemented with methyl-metacrylate has been the only alter native to traditional
cements because of its excellent performance. Nevertheless, different complications associated with
its use, mainly loosenings, required complex and difficult surgical revisions that greatly hindered its utility.
Newly developed materials and cementation techniques have improved clinical and radiological outcomes
of the cemented prosthesis. This has allowed better long-term survival, particularly among elderly patients.
Nevertheless, lifestyles of young patients still overcome the mechanical properties of the prosthesis and affects
the life-span of the acrylical cement used to bind it to the bone. The latter has led to the development of new
models of implants that differ in its form and coatings but that still keep its metal composition.