A 53-year-old man presented to our hospital reporting having detected a mass in the right index finger. We excised the mass, which appeared to be derived from the volar plate and had chalky white depositions at the cutting surface. Histological observations revealed chondrometaplasia and calcium pyrophosphate dihydrate crystal traces, although crystals were not evident owing to decalcification. It was diagnosed as tophaceous pseudogout, which predominantly occurs in the temporomandibular joint. Occurrence in the fingers is rare. Although some studies reported postexcision recurrence, no obvious signs of recurrence were observed at 2.5 years' follow-up in the patient in this report.
Distal ulnar fractures often occur with distal radius fractures (DRFs), and ulnar styloid fractures commonly occur in the setting of DRF. However, isolated ulnar head fractures are rare. We report a case of isolated ulnar head fracture in which we performed bone resection because the ulnar head bone fragment fractured when internal screw fixation was attempted. His outcome at 18 months postoperatively was considered excellent. However, we do not advocate bone resection other than failure of fixation and the difficult case to perform internal fixation. Longer follow-up would be needed because bone resection might lead to osteoarthritis of the distal radioulnar joint in the future.
Hamate hook fractures are usually caused by direct trauma while using a tennis racket or a baseball bat. We report stress fracture of the hamate hook in a water polo player without any specific trauma. We consider that the stress fracture occurred via indirect mechanisms through the flexor tendons. Strong ulnar deviation of the wrist during ball release and strong grip on a ball with outstretched fingers, which are unique to water polo, were the likely causes of the stress fracture of the hamate hook.
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