China
Africa
Explore chapters and articles related to this topic
Advances in Adult Dysplasia
Published in K. Mohan Iyer, Hip Joint in Adults: Advances and Developments, 2018
The triradiate cartilage, that appears as a T-shaped structure at the sixteenth week of gestational age, is responsible for the development, growth and depth of the acetabulum [23,24]. The triradiate cartilage usually closes during the ages between 14 and 16 years [25]. However, secondary growth centres appear in the rim of the acetabulum, which would shape the final acetabulum. For example, os acetabular is an epiphyseal centre adjacent to the pubis, which appears at seven years of age and is closed at nine years of age [24]. It is responsible for the formation of the entire anterior wall of the acetabulum. Other secondary epiphyseal growth plates of the acetabulum close up to 18 years of age [25].
The influence of musculoskeletal forces on the growth of the prenatal cortex in the ilium: a finite element study
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2020
Peter J. Watson, Michael J. Fagan, Catherine A. Dobson
The prenatal specimen did not possess all the triradiate cartilage of the acetabular corpus (Figure 1(a)), therefore a reconstruction technique, based on geometric morphometric methods (Watson et al. 2011), was applied to reconstruct the complete acetabular structure. A landmark configuration consisting of 34 landmarks covering the entire hemi-pelvic structure was manually defined based on identifiable anatomical features (Figure 1(b)). This configuration used the same landmarks described in Watson et al. (2011), with additional landmarks defined round the exterior of the acetabulum. A CT scan of a 19 year old hemi-pelvis was then digitised into a volumetric model and the same landmark configuration then replicated on this fused structure. These landmarks were then used to create a template of appropriate form (size and shape), using warping tools (a triplet of thin plate splines – the ‘Bookstein’ function (Bookstein 1989)) within AVIZO to warp the 19 year old hemi-pelvis to fit the estimated size and shape of the prenatal hemi-pelvis landmark configuration. This created a warped template which superimposed that of the prenatal hemi-pelvis and provided an estimate of the missing triradiate cartilage. Using the contours of the warped template in the regions of the missing triradiate cartilage, a complete prenatal acetabulum was then reconstructed (Figure 1(c)).