Abstract
To investigate the value of the severity of fetal clubfoot evaluated by sonography prenatal. By routine sonography totally 32 feet with clubfoot were chosen as case group, and 414 normal feet between 16 and 38 weeks gestation were enrolled in control group stochastically. The length and width of the foot in both group were measured, and then the length-to- width ratio was calculated. The angle that the long-axis of the foot made with the long-axis of the lower leg was measured and classified into mild, moderate, severe. The foot length, foot width and the length-to-width in both groups were compared. After birth, the fetuses of case group were followed up and Dimeglio score was recorded. The correlation analysis between the ratio and the angle and the Dimeglio score were also made respectively. The length-to-width ratio in case group were smaller than the control group (ZFL=-2.10, p<0.05; ZFL/FW=-8.46, p<0.001), and the foot width was wider (ZFW=-2.06, p<0.05). Significant negative correlation was identified between the ratio and the Dimeglio score (r=-0.600,p<0.01)and significant positive correlation was identified between the angle and the Dimeglio score (r=0.764,P<0.01). By combining the ratio with the angle, the false positive rate dropped from 6/32 (18.8%) to 1/27 (3.7%). The angle and ratio can provide information for prenatal quantitative evaluation the severity of clubfoot and reduce the false positive rate in diagnosis of fetal clubfoot.
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