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Fig. 2 | BMC Musculoskeletal Disorders

Fig. 2

From: Effect of coronal plane acetabular correction on joint contact pressure in Periacetabular osteotomy: a finite-element analysis

Fig. 2

A representative finite-element model of a dysplastic hip after virtual periacetabular osteotomy, with the distribution of the elastic modulus. The bone model was produced with a 2-mm tetrahedral element and a 0.4-mm triangular shell element on its surface. The cartilage of the acetabulum and femoral heads was created with a constant thickness of 1.8 mm and discretized using a locally refined 0.5-mm to 2.0-mm tetrahedral element in the weightbearing region of the acetabular cartilage. To visualize the contact pressure exerted on the acetabular cartilage, three-nodal point shell elements with a thickness of 0.0005 mm were placed on its surface. The loading scenario was based on a single-leg stance, with the hip contact force acting on the nodal point at the femoral head center. During loading, the iliac crest and pubic area were completely fixed, while the distal femur was kept free only in the Z-axis while restrained in the X- and Y-axes. Tied- and sliding-contact constraints were set on the cartilage-to-bone and cartilage-to-cartilage interfaces, respectively. The acetabular fragment was reconnected to the pelvis through a tied contact to simulate a complete bony union. The frictional shear stress between the contacting articular surfaces was ignored

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