Review of the evolution of the cementless acetabular cup.
First-generation porous coated acetabular cups have achieved durable biologic fixation, although liner dissociation and wear were common failure mechanisms. Second-generation modular acetabular cups retained the successful ingrowth surfaces used in earlier cup designs and incorporated congruent contact between the liner and shell. However, impingement-related fractures of highly cross-linked ultra-high-molecular-weight-polyethylene (UHMWPE) used in second-generation cup designs have occurred. Third-generation cup designs that eliminate UHMWPE protruding above the metal rim and minimize sharp corners at the liner-locking mechanism would be expected to reduce the risk of liner fracture in modular acetabular cups used with highly crosslinked UHMWPE.
Ries
Michael D
MD
Department of Orthopaedic Surgery, University of California, San Francisco, CA 94143, USA.
D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000639:trends*; D002484:Cementation; D005544:Forecasting; D006622:Hip Prosthesis / Q000639:trends*; D011474:Prosthesis Design / Q000639:trends*