Os acetabuli and mixed-type FAI. This 79yo male with a history of right hip pain for 1 month has features of both pincer and cam-type FAI. Femoral head asphericity (yellow arrow), irregular anterosuperior bump (green arrowheads), os acetabuli (yellow arrowhead) and hypertrophic acetabular rim (blue arrow).
1 The other 22 pairs are autosomes (non-sex chromosomes) and look the same for both males and females. 2  The DNA making up each of our chromosomes contains thousands of genes. 3  At the ends of each of our chromosomes are sections of DNA called telomeres.
Types of chromosomes: Chromosomes are classified according to their shape, which is determined by the position of the centromere (the point of attachment to the mitotic spindle). 1. Metacentric: If the centromere is present near about in the middle of the chromosome, then it is called as metacentric, i.e., chromosomes have equal or almost equal arms.