Assessment of coxarthritis risk with dimensionless biomechanical parameters.
Acta Bioeng Biomech
; 23(1): 25-34, 2021.
Article
em En
| MEDLINE
| ID: mdl-34846027
ABSTRACT
PURPOSE:
Unfavourable distribution of contact stress over the load bearing area is considered a risk factor for early coxarthritis and it is of interest to outline respective biomechanical parameters for its prediction. The purpose of the work was to develop a transparent mathematical model which can be used to assess contact stress in the hip from imaged structures of pelvis and proximal femora, in large population studies and in clinical practice.METHODS:
We upgraded a previously validated three-dimensional mathematical model of the human hip in the one-legged stance HIPSTRESS by introducing parameters independent from the size of the structures in the images. We validated a new parameter - dimensionless peak stress normalized by the body weight and by the radius of the femoral head (pmaxr²/WB) on the population of 172 hips that were in the childhood subjected to the Perthes disease and exhibited increased proportion of dysplastic hips.RESULTS:
The dimensionless parameter pmaxr²/WB exhibited smaller number of indecisive cases of hip dysplasia predicted by the model than the previously used parameter pmax/WB (6% vs. 81%, respectively). A threshold for an increased risk of early coxarthritis development by the HIPSTRESS parameter H = pmaxr²/WB was found to be 2.CONCLUSIONS:
We proposed a dimensionless peak stress on the load bearing area with the border value of 2 as a decisive parameter over which hips are at risk for early development of degenerative processes and presented a method for determination of biomechanical parameters with the use of nomogram.
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Base de dados:
MEDLINE
Assunto principal:
Cabeça do Fêmur
/
Articulação do Quadril
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article