Hitchhiker's thumb
Inherited trait where the thumb can bend backwards up to 90°
Hitchhiker's thumb
Hitchhiker's thumb is an inherited trait where the distal phalange of the thumb can bend backwards beyond the normal range of motion, up to an angle of 90°. The trait can be present on one or both thumbs. It is typically painless and benign, but can sometimes be associated with genetic diseases such as hypermobility spectrum disorders.
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