Rickets results from impaired mineralisation of the growth plate. Hypophosphataemia is common to all forms of rickets as hypophosphataemia impairs both hydroxyapatite formation and failure of apoptosis of the hypertrophied chondrocytes.
Amongst healthy adolescents, there is a near-normal distribution of the timing of puberty, with the mean age of onset in boys being 11.5 years and in girls 11 years, but wide inter-individual variation.
Precocious puberty is a prevalent endocrine disorder that affects children globally. Classically, precocious puberty is defined as the development of secondary sexual characteristics before age 8 years in girls and 9 years in boys and it has a clear female predominance.