Developmental age idiopathic osteoporosis is a rare metabolic disease, which pathomechanism is different from involutional osteoporosis. Its etiology still remains unknown. An onset of the disease is rapid, affecting previously healthy children of both sexes aged 3.5-15. A rapid loss of bone mass is especially remarkable. Clinical picture of the disease includes pain localised initially in feet, then in thoraco-lumbar section of the vertebral column, gradually progressive deformation of the longitudinal axes of limbs, gait pathology and progressive depletion of a lower limb muscle strength. The onset of the disease is non-specific. Diagnosis is possible on the basis of roentgen imaging depicting rarefaction of cancellous layer of the bone, numerous infractions of long bones and typical for osteoporotic deformation of vertebral shafts with reduction of their vertical dimension. Current research presents two-staged method of rehabilitation applied in developmental age osteoporosis. The main principle of treatment is based on increasing axial load of lower limbs in antigravitational position causing joint surfaces to be pushed together. Final stage of rehabilitation includes interval training on a moving track.