J H Keyak

Summary

Affiliation: University of California
Country: USA

Publications

  1. ncbi request reprint Predicting the strength of femoral shafts with and without metastatic lesions
    Joyce H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA, USA
    Clin Orthop Relat Res 439:161-70. 2005
  2. doi request reprint Reduction in proximal femoral strength due to long-duration spaceflight
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA, USA
    Bone 44:449-53. 2009
  3. pmc Male-female differences in the association between incident hip fracture and proximal femoral strength: a finite element analysis study
    J H Keyak
    Department of Radiological Sciences, University of California, Irvine, CA, USA
    Bone 48:1239-45. 2011
  4. ncbi request reprint The effect of simulated metastatic lytic lesions on proximal femoral strength
    Joyce H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92868 5382, USA
    Clin Orthop Relat Res 459:139-45. 2007
  5. ncbi request reprint Effect of force direction on femoral fracture load for two types of loading conditions
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine Medical Center, Orange 92868 5382, USA
    J Orthop Res 19:539-44. 2001
  6. ncbi request reprint Improved prediction of proximal femoral fracture load using nonlinear finite element models
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92868 5382, USA
    Med Eng Phys 23:165-73. 2001
  7. ncbi request reprint Relationships between femoral fracture loads for two load configurations
    J H Keyak
    Department of Orthopaedic Surgery, University of California Irvine Medical Center, Orange 92868 5382, USA
    J Biomech 33:499-502. 2000
  8. ncbi request reprint Prediction of femoral fracture load using finite element models: an examination of stress- and strain-based failure theories
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine Medical Center, Orange 92868 5382, USA
    J Biomech 33:209-14. 2000
  9. ncbi request reprint Prediction of femoral fracture load using automated finite element modeling
    J H Keyak
    Department of Orthopaedic Surgery, University of California Irvine Medical Center, Orange 92868 5382, USA
    J Biomech 31:125-33. 1998
  10. ncbi request reprint Comparison of in situ and in vitro CT scan-based finite element model predictions of proximal femoral fracture load
    Joyce H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92697, USA
    Med Eng Phys 25:781-7. 2003

Detail Information

Publications23

  1. ncbi request reprint Predicting the strength of femoral shafts with and without metastatic lesions
    Joyce H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA, USA
    Clin Orthop Relat Res 439:161-70. 2005
    ..These models may be useful for assessing the risk of pathologic fractures of femoral shafts...
  2. doi request reprint Reduction in proximal femoral strength due to long-duration spaceflight
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA, USA
    Bone 44:449-53. 2009
    ..If proximal femoral strength is not recovered, some crew members may be at increased risk for age-related hip fractures decades after their missions...
  3. pmc Male-female differences in the association between incident hip fracture and proximal femoral strength: a finite element analysis study
    J H Keyak
    Department of Radiological Sciences, University of California, Irvine, CA, USA
    Bone 48:1239-45. 2011
    ..013). These findings support further exploration of possible sex differences in the predictors of hip fracture and of sex-specific strategies for using FE analysis to manage osteoporosis...
  4. ncbi request reprint The effect of simulated metastatic lytic lesions on proximal femoral strength
    Joyce H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92868 5382, USA
    Clin Orthop Relat Res 459:139-45. 2007
    ..6% of intact; range, 49.2-73.8%). Other defects at the level of the lesser trochanter had a markedly smaller effect. These findings may be helpful for evaluating pathologic fracture risk...
  5. ncbi request reprint Effect of force direction on femoral fracture load for two types of loading conditions
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine Medical Center, Orange 92868 5382, USA
    J Orthop Res 19:539-44. 2001
    ..Therefore, evaluation of hip fracture risk and development of fracture prevention technologies should focus on this high-risk loading condition...
  6. ncbi request reprint Improved prediction of proximal femoral fracture load using nonlinear finite element models
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92868 5382, USA
    Med Eng Phys 23:165-73. 2001
    ..e. those with the lowest fracture loads and likely to be at greatest risk of fracture, would be correctly identified with at least 97.5% reliability. This FE modeling method will be a powerful tool for studies of hip fracture...
  7. ncbi request reprint Relationships between femoral fracture loads for two load configurations
    J H Keyak
    Department of Orthopaedic Surgery, University of California Irvine Medical Center, Orange 92868 5382, USA
    J Biomech 33:499-502. 2000
    ..Thus, 19% of the variance remains unexplained, indicating that the results of studies involving only one load configuration are not necessarily indicative of those that would be found for another configuration...
  8. ncbi request reprint Prediction of femoral fracture load using finite element models: an examination of stress- and strain-based failure theories
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine Medical Center, Orange 92868 5382, USA
    J Biomech 33:209-14. 2000
    ..The relatively strong performance of the distortion energy and tau(max) theories supports the hypothesis that shear/distortion is an important failure mode during femoral fracture...
  9. ncbi request reprint Prediction of femoral fracture load using automated finite element modeling
    J H Keyak
    Department of Orthopaedic Surgery, University of California Irvine Medical Center, Orange 92868 5382, USA
    J Biomech 31:125-33. 1998
    ..Even so, the potential advantages of this CT/FE technique support further research in this area...
  10. ncbi request reprint Comparison of in situ and in vitro CT scan-based finite element model predictions of proximal femoral fracture load
    Joyce H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92697, USA
    Med Eng Phys 25:781-7. 2003
    ..These results demonstrate that using CT scan data obtained in situ instead of in vitro to generate FE models can lead to substantially different predicted fracture loads. This effect must be considered when using this technology in vivo...
  11. pmc Age-related loss of proximal femoral strength in elderly men and women: the Age Gene/Environment Susceptibility Study--Reykjavik
    T F Lang
    Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94143 0946, USA
    Bone 50:743-8. 2012
    ..The gender difference in hip bone strength loss is consistent with the higher incidence of hip fracture among elderly women...
  12. ncbi request reprint Volumetric quantitative computed tomography of the proximal femur: precision and relation to bone strength
    T F Lang
    Department of Radiology, University of California, San Francisco 94143 1250, USA
    Bone 21:101-8. 1997
    ..Thus, trabecular BMD measurements were reproducible and highly correlated to biomechanical strength measurements. These results support further exploration of quantitative CT for assessment of osteoporosis at the proximal femur...
  13. ncbi request reprint Relationships between material properties and CT scan data of cortical bone with and without metastatic lesions
    Tadashi S Kaneko
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92697, USA
    Med Eng Phys 25:445-54. 2003
    ..The rhoQCT-mechanical property relationships reported may be useful for evaluating bone integrity and assessing the risk of fracture of bone with metastases...
  14. doi request reprint Radioactive bone cement for the treatment of spinal metastases: a dosimetric analysis of simulated clinical scenarios
    T S Kaneko
    Department of Radiological Sciences, B140 Med Sci I, University of California, Irvine, CA 92697, USA
    Phys Med Biol 57:4387-401. 2012
    ....
  15. ncbi request reprint Prediction of fracture location in the proximal femur using finite element models
    J H Keyak
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92868 5382, USA
    Med Eng Phys 23:657-64. 2001
    ..These results provide evidence that CT scan-based FE models of the proximal femur can predict fracture location and fracture type with moderate accuracy...
  16. ncbi request reprint Mechanical properties, density and quantitative CT scan data of trabecular bone with and without metastases
    Tadashi S Kaneko
    Department of Orthopaedic Surgery, University of California, Irvine, CA 92868 5382, USA
    J Biomech 37:523-30. 2004
    ....
  17. ncbi request reprint Stiff and strong compressive properties are associated with brittle post-yield behavior in equine compact bone material
    C M Les
    Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis 95616 8732, USA
    J Orthop Res 20:607-14. 2002
    ..This feature may serve as a functional tipper limit to the maximization of bone material stiffness and strength...
  18. ncbi request reprint Feasibility of a percutaneous technique for repairing proximal femora with simulated metastatic lesions
    Tadashi S Kaneko
    Department of Orthopaedic Surgery, University of California, Irvine, B170 Medical Sciences I, Irvine, CA 92697, USA
    Med Eng Phys 29:594-601. 2007
    ....
  19. doi request reprint Lytic lesions in the femoral neck: Importance of location and evaluation of a novel minimally invasive repair technique
    Tadashi S Kaneko
    Department of Orthopaedic Surgery, B170 Medical Sciences I, University of California, Irvine, California 92697, USA
    J Orthop Res 26:1127-32. 2008
    ..These findings may lead to a reduction in the number of patients who suffer a preventable pathologic fracture, a decreased likelihood of unnecessary surgery, and a less invasive prophylactic surgical procedure...
  20. doi request reprint Evaluation of a radiation transport modeling method for radioactive bone cement
    T S Kaneko
    Department of Radiological Sciences, B170 Med Sci I, University of California, Irvine, CA 92697, USA
    Phys Med Biol 55:2451-63. 2010
    ..However, the accuracy of the modified model results indicated that, when this source of uncertainty is accounted for, this modeling method can be used to predict dose distributions in vertebrae containing radioactive cement...
  21. doi request reprint Quantitative computed tomography reveals the effects of race and sex on bone size and trabecular and cortical bone density
    Isra Saeed
    Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94143 0946, USA
    J Clin Densitom 12:330-6. 2009
    ..Lower fracture rates in AA elderly compared with CA elderly are consistent with higher peak bone density, particularly in the trabecular compartment, and potentially lower rates of age-related bone loss rather than larger bone size...
  22. ncbi request reprint Computed tomographic osteoabsorptiometry of the elbow joint in clinically normal dogs
    Valerie F Samii
    Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis 95616, USA
    Am J Vet Res 63:1159-66. 2002
    ..To evaluate subchondral bone density patterns in elbow joints of clinically normal dogs by use of computed tomographic (CT) osteoabsorptiometry...
  23. ncbi request reprint Differences in hip quantitative computed tomography (QCT) measurements of bone mineral density and bone strength between glucocorticoid-treated and glucocorticoid-naive postmenopausal women
    Kuo Chiang Lian
    Department of Medicine and Radiology, University of California San Francisco, San Francisco, CA 94143, USA
    Osteoporos Int 16:642-50. 2005
    ..The purpose of this investigation was to determine if there are differences in the quantities of trabecular and cortical bone and bone strength of the hip between GC-treated osteoporotic patients and controls...