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We present a case report of a 15-year-old kendo (Japanese fencing) player who suffered a stress fracture of the ulnar styloid process. Exercise of the kendo requires the athlete to flex his non-dominant wrist repeatedly in an ulnar direction, and causes the disorder. Excision of the osteochondral fragment relieved the symptoms. This lesion is likely to occur with other sports or activities which demand similar motion of the wrists.

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The responsiveness of receptors supplying the oral mucosa to air pressures generated during consonant production was investigated to obtain information about hypothetical mechanisms underlying speech deficits. The delay between the onset of the neural discharge and the pop puff of phonation (mouth-exit pressure) for /pa/ production was significantly shorter and less variable than it was for /ta/ and /ka/ production, suggesting that the discharge is more closely coupled to the onset of /pa/ production. The data were interpreted to imply that single fibers of the Infraorbital nerve respond to the build-up of oral air pressure during /pa/ production. This, and similar sensory information, may be used by the central neural mechanisms which monitor and control the air pressures required for phonation.

No abstract