The importance of growth hormone replacement therapy for bone mass in young adults with growth hormone deficiency

Growth hormone (GH) plays an important role in longitudinal bone growth in childhood, accrual of peak bone mass, and bone preservation in adults. GH d eficiency (GHD) is associated with reduced bone turnover and decreased bone mineral density (BMD), especially in patients with childhood-onset GHD, GH replacement therapy stimulates bone remodeling and causes an initial decre ase in BMD due to bone resorption and expansion of the remodeling space. Th is is followed by increased bone formation and a significant increase in BM D that continues with prolonged CH therapy. The effect appears to be dose-d ependent. GH dose should be individualized based on factors such as age, or al estrogen therapy, and IGF-I levels. Young GH-deficient adults with low B MD measurements by dual-energy X-ray (DEXA) scan should be considered for G H replacement therapy to reduce future fracture risk.