Scope
The investigators of the Computer Analysis Laboratory employ state-of-the-art finite element techniques to compute the stresses, strains and displacements that an orthopaedic implant, as well as the skeletal tissues, may be subjected to during use by a patient. These analytical methods form a complement to the "bench" modeling conducted in the Implant Biomechanics Laboratory, and the animal modeling of the Bone and Tissue Biomechanics Laboratory, again with the goal of developing implant designs and associated surgical techniques that will provide a lifetime of use to the patient.
Research
The current research includes the investigation of the effects of the mechanical factors, including the bonding of the cement-bone and/or cement-metal interfaces, the surface finish and geometry of prostheses, and material properties, on the stability of fixation of the Exeter femoral component, thermal necrosis of the bone due to cement polymerization in surface replacements of hip joints, and the effects of the contact stresses, areas and creep on the wear of polyethylene.
Apparatus
Intel workstations, Patran and Abaqus programs
Staff
The Computer Analysis Laboratory is under the direction of Zhen Lu, Ph.D.
Selected Publications
- Lu, Z. and McKellop, H.A.: Effects of Cement Creep on Stem Subsidence and Stresses in the Cement Mantle of a Hip Replacement. J Biomed Mater Res, 34:2, 221-226, 1997.
- Lu, Z. and McKellop, H.A.: Frictional Heating of Bearing Materials Tested in a Hip Joint Wear Simulator. Pro Instn Mech Engrs, 211: H, 101-108, 1997.
- Lu, Z., McKellop H.A., Liao, P., and Benya, P.: Potential Thermal Artifacts In Hip Joint Wear Simulators. J Biomed Mater Res (Appl Biomater), 48:4, 458-464, 1999.
- Campbell, P., Beaule, P.E., Ebramzadeh, E., LeDuff, M., Smet, K.D., Lu, Z., Amstutz, H.C.: The John Charnley Award: A study of implant failure in metal-on-metal surface arthroplasties. Clin Orthop Relat Res, 453:35-46, 2006.
- Beaule, B.E., Campbell, P., Lu. Z., Beck, M., Leunig M., Thomas, B., Ganz, R.: Vascularity of the arthritic femoral head and hip resurfacing. J Bone Joint Surg Am, 88 Suppl 4:85-96, 2006.
Contact
Zhen Lu Park, Ph.D., ZLu@laoh.ucla.edu, tel: (213) 742-1065
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Computer model of a femur with a hip replacement
Temperatures in the bone during cementing of a hip surface replacement
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