An assessment of the biological fixation of a retrieved Mayo femoral component.
Implant analysis was conducted on a retrieved Mayo femoral prosthesis that has a non-anatomic design with two distinct surfaces intended for osseous fixation. The prosthesis itself has a circumferential grit-blasted region interposed with the porous surfaces and involving the entire proximal stem. In addition, there are pads of mesh porous coating on the anterior, posterior, and medial surfaces proximally. A single, radiographically stable stem retrieved after 18 months secondary to recurrent dislocations was examined for osseous fixation by measurement of trabecular bone into the porous-coated and onto the grit-blasted surfaces of the stem. Results showed 17% +/- 7% bone ingrowth into the porous coated areas and 20% +/- 16% osseointegration onto the grit-blasted surfaces. These results are similar to percentages of ingrowth seen with more conventional, anatomic design prostheses.
Indiana University, School of Medicine, Department of Orthopedics, 541 Clinical Drive, Room 600, Indianapolis, IN 46202-5111, USA. rmeldrum@iupui.edu
Russell D
RD
Meldrum
Bettina M
BM
Willie
Roy D
RD
Bloebaum
D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005271:Femur Head Necrosis / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008854:Microscopy, Electron; D016348:Osseointegration / Q000502:physiology*