Thumb Injury FAQs - Hairline fracture of thumb
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A thumb fracture is a break in one of the two small bones (phalanges) that make up the thumb. It is important to treat a thumb fracture as soon as possible--or the. Thumb fractures are usually a result of direct stress, such as from a fall or catching a baseball without a glove. Fractures may be caused indirectly from twisting or.