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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.

Etymology
The trait is named hitchhiker's thumb as it resembles the hand gesture used to hitch a ride on the side of a road. == Signs and symptoms ==
Signs and symptoms
Hitchhiker's thumb involves having a thumb with a distal phalange that is able to bend backwards beyond the normal range of motion (50°), up to an angle of 90°. Some people with hitchhiker's thumb also have a Z-shaped deformity, named after the appearance of this deformity. The trait in itself is usually painless and does not normally affect usage of the hands. == Causes ==
Causes
Hitchhiker's thumb is a genetic trait and is inherited in an autosomal recessive manner. It may sometimes be associated with genetic diseases, including: • diastrophic dysplasiahypermobility spectrum disorderatelosteogenesis, type II • atelosteogenesis, type III == Incidence ==
Incidence
Hitchhiker's thumbs affect 24–36% of the U.S. population. == See also ==
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