Ingrowth reduces implant-to-bone relative displacements in canine acetabular prostheses

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
J P HeinerR Vanderby


We examined bone-to-implant relative displacement of acetabular prostheses acutely and after ingrowth in a canine model. Uncemented hemispherical acetabular cups with titanium mesh pads comprising approximately 26% of the surface of the cup were inserted in eight adult canine hemipelves ex vivo. The acetabular prostheses were fixed with 13 mm titanium screws. Zero, one, and two-screw configurations were tested, with the order of testing randomly assigned. A load simulating 1,000 cycles of canine gait as applied to the acetabular component, and relative displacements were measured at three locations between implant and bone to determine acute fixation. A repeated measures analysis of variance showed that two screws produced only 42% of the average relative displacement of one screw and 14% that of zero screws. Eight adult mixed-breed dogs then underwent unilateral total hip arthroplasty. All acetabula were biologically fixed with two cancellous screws. The results at 4 months showed significantly less relative displacement between the implant and bone than was measured in ex vivo implantations (p = 0.014). Bone ingrowth filled 20 +/- 6% (mean +/- SD) of the available space. The relative displacements of these implants were small...Continue Reading


May 1, 1975·Clinical Orthopaedics and Related Research·J SchatzkerJ P Murnaghan
Dec 1, 1991·The Journal of Arthroplasty·J B StiehlD A Skrade
May 1, 1990·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·D R SumnerJ R Kuszak
May 1, 1986·Proceedings of the National Academy of Sciences of the United States of America·W A HodgeR W Mann
Jan 1, 1984·Journal of Biomechanics·G BergmannR Koelbel

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