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Traditionally, chronic digital neuropathy of the palmar digital nerve supplying the median aspect of the thumb, caused by perineural fibrosis, has been called a “bowler’s thumb.”1,2⇓ Infrequently, a bowler’s thumb lesion is a traumatic neuroma caused by the proliferation of fibrous tissues, both around and within the digital nerve. These phenomena are the result of adaptive changes in the thumb in response to frequent insertion and compression in the holes of the bowling ball.2
The clinical presentation of this condition may include paresthesias, hypesthesia, changes in two-point discrimination sense, or a positive Tinel sign in the distribution of the involved digital nerve, which may be thickened and firm to palpation.
This condition is most commonly described in bowling enthusiasts (17/25),2 although similar involvement can be caused by other sporting activities such as baseball,3 by repetitive use injuries,4 and following finger surgery.2 …
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