Sandal gap
A sandal gap , also known by the synonym sandal furrow , is the presence of an unusually large distance between the first and second toe (1st and 2nd ray) in humans, which is caused by an outwardly offset position of the big toes. The term sandals gap or furrow is derived from the fact that there are sandals that are mainly held on the foot by a strap between the first and second toe, these are so-called thong sandals such as flip-flops .
A gap in a sandal does not restrict the mobility and functionality of the foot , so that medical correction is not necessary.
In prenatal diagnosis, the presence of a gap in a sandal is considered a sonographic soft marker for trisomy 8 , Patau's syndrome (trisomy 13), Edwards syndrome (trisomy 18) and Down's syndrome (trisomy 21), although people without special features can also have a sandal gap.
