The radial sesamoid of the first metacarpophalangeal joint, also encountered in every subject, was the best indicator of sexual maturity, but not as good an indicator of skeletal maturity. It indicates that puberty has already started and that height velocity is in the accelerating phase and that 88% of adult height is reached. Usually it became visible radiographically 0.5 years after the onset of pubic hair development, 0.75 years after the initiation of the height spurt and 0.7 years before peak height velocity. ![]() Also it showed a very close relationship with the onset of secondary sex characters and with ages at initiation and peak of adolescent height velocity. The age, height, weight, percentage of adult height and skeletal age attained at appearance of the sesamoids showed the smallest variation with this sesamoid. The ulnar sesamoid of the first metacarpophalangeal joint, encountered in every subject, was a better maturity indicator than the other sesamoids of the hand. The relationship between the ages of appearance of the sesamoids to growth and skeletal and sexual development was studied. Frequency and ages at appearance of the sesamoid bones of the hand was determined from 6-monthly longitudinal data in 83 girls.
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