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.
Of the 23 pairs of chromosomes, the first 22 pairs are called autosomes. The final pair is called the sex chromosomes. Sex chromosomes determine an individual's sex: females have two X chromosomes (XX), and males have an X and a Y chromosome (XY). The mother and father each contribute one set of 22 autosomes and one sex chromosome. Top of page