一级亲属的发病率是普通人群的 17 倍。[1]Barker S, Chesney D, Miedzybrodzka Z, et al. Genetics and epidemiology of idiopathic congenital talipes equinovarus. J Pediatr Orthop. 2003;23:265-272.http://www.ncbi.nlm.nih.gov/pubmed/12604963?tool=bestpractice.com[2]Dietz F. The genetics of idiopathic clubfoot. Clin Orthop Relat Res. 2002;(401):39-48.http://www.ncbi.nlm.nih.gov/pubmed/12151881?tool=bestpractice.com[6]Cowell HR, Wein BK. Genetic aspects of club foot. J Bone Joint Surg Am. 1980;62:1381-1384.http://www.ncbi.nlm.nih.gov/pubmed/7440621?tool=bestpractice.com[11]Wynne-Davies R. Family studies and the cause of congenital club foot, talipes equinovarus, talipes calcaneo-valgus and metatarsus varus. J Bone Joint Surg Br. 1964;46-B:445-463.http://www.jbjs.org.uk/cgi/reprint/46-B/3/445http://www.ncbi.nlm.nih.gov/pubmed/14216453?tool=bestpractice.com二级亲属的发病率是普通人群的 6 倍。同卵双胞胎两个胎儿均受影响的几率>30%。我们得出以下结论:如果一个男婴患有马蹄足,其弟弟受影响的几率是 1/42(比妹妹受影响的几率小)。如果一个女婴患有马蹄足,则其弟弟受影响的几率是 1/16,其妹妹则是 1/40。如果父母一方和一个孩子有马蹄足,之后的孩子患马蹄足的几率是 1/4。