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01.02.2010 | Symposium: Papers Presented at the Hip Society Meetings 2009 | Ausgabe 2/2010

Clinical Orthopaedics and Related Research® 2/2010

Durability of Second-generation Extensively Porous-coated Stems in Patients Age 50 and Younger

Clinical Orthopaedics and Related Research® > Ausgabe 2/2010
BS Jennifer A. Moyer, MD Catherine M. Metz, MD John J. Callaghan, BS David W. Hennessy, MD Steve S. Liu
Wichtige Hinweise
One or more of the authors (JJC) has received funding (royalties and consulting) from DePuy, Warsaw, IN. None of the authors were involved in the development of this implant.
Each author certifies that his or her institution has approved the reporting of these cases, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.


Early versions of uncemented femoral total hip stems were often associated with thigh pain thought to be due to micromotion between the implant and bone in the distal uncoated regions. An extensively coated stem was introduced in 1992 to reduce that risk. We therefore asked whether second-generation extensively porous-coated cementless femoral stems in patients younger than 50 years of age would (1) be durable in terms of revisions; (2) provide high functional scores and reduce thigh pain; and (3) show radiographic signs of durability, including a reduction in stress shielding. We prospectively followed all 100 patients (115 hips) age 50 and younger treated with primary cementless total hip arthroplasties using a second-generation extensively porous-coated femoral stem between June 1994 and December 1999. The average age was 39.6 years (range, 17–50 years). The stems were mated to cementless acetabular components. Ninety patients were followed for a minimum of 5 years (mean, 8.6 years; range, 5–10 years). One stem was revised after a periprosthetic fracture. None were revised for loosening and all stems demonstrated bony ingrowth at last followup. No acetabular shell was revised for loosening and none was radiographically loose. Six acetabular liners were revised for wear (three each were 22-mm and 26-mm heads). This second-generation extensively porous-coated stem was durable at 5- to 10-year followup in this young active population.
Level of Evidence: Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

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