| Autor: |
Firminger CR; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.; Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada.; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada., Haider IT; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada., Bruce OL; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.; Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada.; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada., Wannop JW; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada., Stefanyshyn DJ; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.; Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada., Edwards WB; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.; Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada.; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada. |
| Abstrakt: |
Patellar tendinopathy is an overuse injury that occurs from repetitive loading of the patellar tendon in a scenario resembling that of mechanical fatigue. As such, fatigue-life estimates provide a quantifiable approach to assess tendinopathy risk and may be tabulated using nominal strain (NS) or finite element (FE) models with varied subject-specificity. We compared patellar tendon fatigue-life estimates from NS and FE models of twenty-nine athletes performing countermovement jumps with subject-specific versus generic geometry and material properties. Subject-specific patellar tendon material properties and geometry were obtained using a data collection protocol of dynamometry, ultrasound, and magnetic resonance imaging. Three FE models were created for each subject, with: subject-specific (hyperelastic) material properties and geometry, subject-specific material properties and generic geometry, and generic material properties and subject-specific geometry. Four NS models were created for each subject, with: subject-specific (linear elastic) material properties and moment arm, generic material properties and subject-specific moment arm, subject-specific material properties and generic moment arm, and generic material properties and moment arm. NS- and FE-modelled fatigue-life estimates with generic material properties were poorly correlated with their subject-specific counterparts ( r 2 ≤0.073), while all NS models overestimated fatigue life compared to the subject-specific FE model ( r 2 ≤0.223). Furthermore, FE models with generic tendon geometry were unable to accurately represent the heterogeneous strain distributions found in the subject-specific FE models or those with generic material properties. These findings illustrate the importance of incorporating subject-specific material properties and FE-modelled strain distributions into fatigue-life estimations. |
