Relation Between Vertical Orientation and Stability of Acetabular Component in the Dysplastic Hip Simulated by Nonlinear Three‐dimensional Finite Element Method
- 22 October 2004
- journal article
- Published by Wiley in Artificial Organs
- Vol. 28 (11), 1050-1054
- https://doi.org/10.1111/j.1525-1594.2004.00017.x
Abstract
In acetabular dysplasia, more vertical orientation of the acetabular component is often used to minimize the superolateral bone grafting. This study was designed to determine the effects of vertical orientation of the cup on the stability and polyethylene wear of the acetabular component in uncemented total hip arthroplasty (THA). Three-dimensional finite element models of the hemipelvis with dysplastic acetabulum were developed. Metal-backed hemispherical cups were placed in the true acetabulum with abduction angles of 35, 45, 55, and 65 degrees. It was found that more vertical orientation of the cup was associated with larger relative motion of the metal shell between the acetabulum and metal shell. Furthermore, tilting and torsional shear stresses in the model of the cup abduction angle of 65 degrees were found to be 1.7 times larger than that in the model with 35 degrees at the bone-metal shell interface. More vertically oriented cups caused larger contact stresses at the articulating surfaces of the polyethylene liners. The results suggest that the abduction angle of the acetabular component significantly influences cup loosening and polyethylene wear in THA.Keywords
This publication has 37 references indexed in Scilit:
- An oblong revision cup for large acetabular defects: Design rationale and two- to seven-year follow-upThe Journal of Arthroplasty, 1998
- Cement Debonding Process of Total Hip Arthroplasty StemsClinical Orthopaedics and Related Research, 1997
- Load transfer across the pelvic boneJournal of Biomechanics, 1995
- Effects of porous coating, with and without collar support, on early relative motion for a cementless hip prosthesisJournal of Biomechanics, 1993
- Experimental determination of friction characteristics at the trabecular bone/porous‐coated metal interface in cementless implantsJournal of Biomedical Materials Research, 1993
- Tissue ingrowth into titanium and hydroxyapatite‐coated implants during stable and unstable mechanical conditionsJournal of Orthopaedic Research, 1992
- A finite element study of the effect of diametral interface gaps on the contact areas and pressures in uncemented cylindrical femoral total hip componentsJournal of Biomechanics, 1991
- Femoral Head Autografting With Total Hip Arthroplasty for Lateral Acetabular DysplasiaClinical Orthopaedics and Related Research, 1990
- Observations on the Effect of Movement on Bone Ingrowth into Porous-Surfaced ImplantsClinical Orthopaedics and Related Research, 1986
- The effect of movement on the bonding of porous metal to boneJournal of Biomedical Materials Research, 1973