Three-dimensional model of the supraspinatus tendon
Keywords:
Rotator Cuff, Computer Simulation, Finite Element AnalysisAbstract
Introduction: In rotator cuff disease, it is known that tear size is associated with symptoms’ onset, but there are no tools for predicting the evolution in size of a given lesion. With this in mind and with the idea to develop in the future a tool that could provide clinicians with information regarding tear evolution, a line of research was started to investigate the failure mechanism of the tendon, which begins with the mechanical characterization and three dimensional modeling of a healthy supraspinatus tendon.
Methods: Seven healthy human cadaveric scapula-supraspinatus tendon-humerus complex where mechanically characterized under uniaxial loading. The data obtained was used to fed a computerized 3D lineal isotropic model made of medical images.
Results: From the uniaxial test, stress-strain curves where obtained that were homogeneous for 20% of initial deformation. Young’s modulus and Poisson’s ratio were calculated. The three dimensional model showed higher effort concentration in the central portion of the tendon, in its articular side near the insertion area. There was a 5% decrease in the magnitude of the efforts when the acromion was removed from the model.
Discussion: The mechanical characteristics of a healthy tendon were successfully obtained. The stress distribution found in the three dimensional model is consistent with that reported in the literature. The acromion seems to have little importance in the magnitude of the efforts in our model. The model can be used further to study the tendon’s failure mechanism and help us develop a clinical tool in the future.
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