Total Hip Replacement: Tensile Stress in Bone Cement is influenced by Cement Mantle Thickness, Acetabular Size, Bone Quality, and Body Mass Index
- *Corresponding Author:
- Rajshree Mootanah, PhD MBA
Director, Medical Engineering Research Group and Senior Lecturer
Department of Engineering and Built Environment
Faculty of Science & Technology Anglia Ruskin University Bishop Hall Lane Chelmsford
Essex CM1 1SQ, UK
E-mail: [email protected]
Received Date: March 04, 2014; Accepted Date: March 12, 2014; Published Date: March 14, 2014
Citation: Lamvohee JMS, Ingle P, Cheah K, Dowell J, Mootanah R (2014) Total Hip Replacement: Tensile Stress in Bone Cement is influenced by Cement Mantle Thickness, Acetabular Size, Bone Quality, and Body Mass Index. J Comput Sci Syst Biol 7:072-078. doi: 10.4172/jcsb.1000140
Copyright: © 2014 Lamvohee JMS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Background: High stress developed in the cement mantle of a total hip replacement is reported to contribute to premature failure of acetabular components. We postulate that stress level is influenced by cement mantle thickness, acetabular size, bone quality and body mass index. Methods: Finite element models of reconstructed hemi pelves of different sizes and acetabular diameters (46, 52 and 58 mm) were created from CT-Scan data. We investigated the effects of cement mantle thickness (1, 2, 3 and 4 mm), acetabular size, body mass index (BMI = 20, 25 and 30 kg/m2) and bone quality on stress level developed in the cement mantle. Findings: Peak tensile stresses in the cement mantle increased with a decrease in cement mantle thickness, acetabular size and bone quality and an increase in BMI. Interpretation: Our results indicate that a 4-mm-thick cement mantle is required in small reconstructed acetabulae of ≤ 50-mm diameters, while a 1-mm thick cement mantle can be used on larger reconstructed acetabulae of ≥ 58 mm diameter. Patients with poor bone quality require at least a 4-mm-thick cement mantle to reduce the risk failure caused by high stress level in the cement mantle.