Contact stress distributions on the femoral head of the emu (Dromaius novaehollandiae) |
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| Authors: | Karen L Troy Thomas D Brown Michael G Conzemius |
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| Institution: | 1. Department of Kinesiology and Nutrition, University of Illinois at Chicago, United States;2. Department of Bioengineering, University of Illinois at Chicago, United States;3. Department of Orthopaedics and Rehabilitation, University of Iowa, United States;4. Department of Biomedical Engineering, University of Iowa, United States;5. College of Veterinary Medicine, University of Minnesota, United States;1. Electron Microscope Unit, Department of Anatomy and Physiology, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, Gauteng, South Africa;2. Department of Anatomy and Physiology, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, Gauteng, South Africa;1. Department of Biochemistry McGill University, Montreal, Quebec, Canada;2. Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden;3. Cold Spring Harbor Laboratories, Cold Spring Harbor, NY;4. Memorial Sloan-Kettering Cancer Center, New York, NY;5. Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany;6. Department of Biological Science, Florida State University, Tallahassee, FL;7. Department of Oncology, McGill University, Montreal, Quebec, Canada;8. The Rosalind and Morris Goodman Cancer Research Center, McGill University, Montreal, Quebec, Canada;9. Howard Hughes Medical Institute, New York, NY;1. Division of Hematology, Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH;2. Center for Biostatistics, The Ohio State University, Columbus, OH;1. College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, Hubei, PR China;2. Xinyang College of Agriculture and Forestry, Xinyang 464000, Henan, PR China |
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| Abstract: | Osteonecrosis of the femoral head remains a challenging orthopaedic problem. The disease frequently progresses to femoral head collapse, leading to debilitating osteoarthritis in the affected hip(s). Since a major goal of pre-collapse interventions is to forestall the need for hip arthroplasty, it is important that any animal models used to develop or study such interventions also have a natural history of progression to femoral head collapse. The emu (Dromaius novaehollandiae), a large flightless bird native to Australia, consistently progresses to femoral head collapse when osteonecrosis is experimentally induced cryogenically. Full biomechanical characterization of the demands this animal places on its hip is an important consideration in future usage of this model. This study reports in vitro measurement of the contact stress distributions on the emu femoral head during stance phase of the gait cycle, using Fuji pressure-sensitive film. Applied hip loadings were based upon ground reaction forces and hip flexion angles recorded in vivo. The contact stress data showed reasonable homology with the human hip, both in terms of stress magnitude and sites of habitual loading on the femoral head. |
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