Effects of Prosthesis Stem Tapers on Stress Distribution of Cemented Hip Arthroplasty

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3510578· OSTI ID:21428644

Abdullah, Abdul Halim; Nor, Mohd Asri Mohd; Saman, Alias Mohd ^[1]; Tamin, Mohd Nasir; Kadir, Mohammed Rafiq Abdul ^[2]

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1. Faculty of Mechanical Engineering, Universiti Teknologi MARA Malaysia, 40450 Shah Alam, Selangor (Malaysia)
2. Computational Solid Mechanics Laboratory, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor (Malaysia)

Aseptic loosening effects are critical issues in encouraging long term stability of cemented hip arthroplasty. Stress shielding is believed to be an important factor that contributes to the aseptic loosening problems. The numerous changes in the prosthesis stem design are intended to minimize the stress shielding and aseptic loosening problems and to improve the long term performance of the implants. In this study, the stress distribution in cemented hip arthroplasty is established using finite element method. The taper of the prosthesis is designed to be 3 deg. at anterior/posterior, 3 deg. at medial/lateral and 10 deg. from wide lateral to narrow medial. Major muscle loads and contact forces are simulated for walking (toe-off phase) and stair climbing load cases. Effects of prosthesis stem tapers on the resulting stress distribution are investigated. Results show that compressive stress dominates in the medial plane while tensile stress in the lateral plane of the femur. The corresponding stress levels of intact femur for walking and stair-climbing load cases are 22 and 29 MPa, respectively. The magnitude of Tresca stress for the THA femur in stair-climbing load case remains higher in the region of 85 MPa while the walking load case induces around 40 MPa. The stress range in the straight and single taper stem prosthesis is lower than 260 MPa, while localized Tresca stress is in the order of the yield strength of Ti-6Al-4V alloy for double and triple taper stem design.

• OSTI ID: 21428644
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1285; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ALUMINIUM ALLOYS
BODY
CALCULATION METHODS
DESIGN
DIMENSIONLESS NUMBERS
DISTRIBUTION
FEMUR
FINITE ELEMENT METHOD
IMPLANTS
MATHEMATICAL SOLUTIONS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
ORGANS
POISSON RATIO
PRESSURE RANGE
PRESSURE RANGE MEGA PA
SHIELDING
SKELETON
STRESSES
TRANSITION ELEMENT ALLOYS
YIELD STRENGTH