1. Gradient of contact stress in normal and dysplastic human hips
- Author
-
Aleš Iglič, Rok Vengust, Matej Daniel, Veronika Kralj-Iglič, Borut Pompe, and Miroslav Sochor
- Subjects
Male ,musculoskeletal diseases ,Friction ,Biomedical Engineering ,Biophysics ,Absolute value (algebra) ,medicine.disease_cause ,Body weight ,Models, Biological ,Lower limit ,Weight-bearing ,Weight-Bearing ,Reference Values ,medicine ,Humans ,Computer Simulation ,Hip Dislocation, Congenital ,Mathematics ,Acetabular rim ,Hip dysplasia ,Body Weight ,Anatomy ,medicine.disease ,Radiography ,Dysplasia ,Harris Hip Score ,Female ,Hip Joint ,Stress, Mechanical - Abstract
The stress gradient index (G(p)) is introduced for the assessment of dysplasia in human hip joint. The absolute value of G(p) is equal to the magnitude of the gradient of the contact stress at the lateral acetabular rim. The parameter G(p) normalized with respect to the body weight (W(B)) is determined from the standard anteroposterior radiographs of adult human hips and pelvises using the mathematical model. The average value of G(p)/W(B) was determined for the group of dysplastic hips and for the group of normal hips. In the group of normal hips the average value of G(p)/W(B) is smaller (-0.445x10(5) m(-3)) than in the group of dysplastic hips (+1.481x10(5) m(-3)). The difference is statistically significant P
- Published
- 2003