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Hitchhiker's thumb, also known as distal hyperextensibility of the thumb is the condition of having a thumb that has a distal phalange that bends backwards in an angle of 90°, it is thought to be inherited in an autosomal recessive manner, however, it presents on genetic disorders that are inherited in an autosomal dominant manner This condition is benign and does not cause pain or affect the thumb with the trait negatively.
If a person has the genes for this condition, it might present bilaterally, unilaterally, or on none of the thumbs.
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