PTGFR and Hip dysplasia: Based on the above results, Sanger sequencing was performed in 250 sporadic cases of DDH in China and showed that SNPs of HSPG2(chr1:22201470), ATP2B4 (chr1:203682345), and prostaglandin F receptor (PTGFR) (chr1:79002214) were not associated with DDH in Chinese Han population (Xu X. et al., 2021).