The growing interest in the tandem of osteoporosis and sarcopenia is dictated by a higher level of low-traumatic fractures, disability, and mortality than against the background of individual diseases. Osteoporosis and sarcopenia are associated with aging and are characterized by a simultaneous decrease in bone and muscle mass. Osteoporosis and sarcopenia share common risk factors (genetic, endocrine, dietary and lifestyle conditions) and etiopathogenetic pathways that combine diseases into a single syndrome known as osteosarcopenia. Among the hormonal factors that play a leading role in the development and maintenance of the functional state of bone and muscle tissue, it is necessary to single out estrogens. Currently available research results confirm the protective effect of hormone replacement therapy in relation to osteoporosis. Data on sarcopenia and hormone replacement therapy require further research. Correct understanding and application of therapeutic strategies is essential in order to stop the growing wave of low-traumatic fractures.