An Anatomical Study for Arthritis of the Carpometacarpal Joint of the Thumb

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We observed macerated carpal bones for the purpose of detecting the morphological risk factor for arthritis of the carpometacarpal joint of the thumb.Material and MethodFifty cadavers (thirty-eight male and twelve female, average age 62.0 years) were studied. Degeneration of the Trapezium were observed macroscopically and by soft X-rays and classified by North's classification.Results1. There were no differences between the right and left hand in regard to the risk point.2. Degeneration of the CMJ occurred almost bilaterally.3. The risk point increased according to age.4. There were no close relationships between degeneration of the CMJ and osteoporosis.Results. 1 and 2. implied that the heredity of an individual was the most important factor in arthritis of the CMJ, but we could not detect the morphological risk factor in the macerated carpal bones.