Discrete element analysis is a valid method for computing joint contact stress in the hip before and after acetabular fracture
| Autor: | Andrew M. Kern, Kevin C. Townsend, M. James Rudert, Jessica E. Goetz, Holly D. Thomas-Aitken, Michael C. Willey, Donald D. Anderson |
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| Rok vydání: | 2018 |
| Předmět: |
Adult
Male Models Anatomic Materials science medicine.medical_treatment Finite Element Analysis 0206 medical engineering Biomedical Engineering Biophysics 02 engineering and technology Article Stress (mechanics) 03 medical and health sciences 0302 clinical medicine Stress Physiological Osteoarthritis Cadaver medicine Humans Orthopedics and Sports Medicine Reduction (orthopedic surgery) Aged Hip Fractures Rehabilitation Acetabular fracture Acetabulum 030229 sport sciences medicine.disease 020601 biomedical engineering Finite element method Biomechanical Phenomena Cartilage Contact mechanics Spinal Fractures Hip Joint Tomography X-Ray Computed Contact area Cadaveric spasm Biomedical engineering |
| Zdroj: | Journal of Biomechanics. 67:9-17 |
| ISSN: | 0021-9290 |
| DOI: | 10.1016/j.jbiomech.2017.11.014 |
| Popis: | Evaluation of abnormalities in joint contact stress that develop after inaccurate reduction of an acetabular fracture may provide a potential means for predicting the risk of developing post-traumatic osteoarthritis. Discrete element analysis (DEA) is a computational technique for calculating intra-articular contact stress distributions in a fraction of the time required to obtain the same information using the more commonly employed finite element analysis technique. The goal of this work was to validate the accuracy of DEA-computed contact stress against physical measurements of contact stress made in cadaveric hips using Tekscan sensors. Four static loading tests in a variety of poses from heel-strike to toe-off were performed in two different cadaveric hip specimens with the acetabulum intact and again with an intentionally malreduced posterior wall acetabular fracture. DEA-computed contact stress was compared on a point-by-point basis to stress measured from the physical experiments. There was good agreement between computed and measured contact stress over the entire contact area (correlation coefficients ranged from 0.88-0.99). DEA-computed peak contact stress was within an average of 0.5 MPa (range 0.2 MPa - 0.8 MPa) of the Tekscan peak stress for intact hips, and within an average of 0.6 MPa (range 0 – 1.6 MPa) for fractured cases. DEA-computed contact areas were within an average of 33% of the Tekscan-measured areas (range: 1.4% - 60%). These results indicate that the DEA methodology is a valid method for accurately estimating contact stress in both intact and fractured hips. |
| Databáze: | OpenAIRE |
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