Abstract
Three cases of young women who developed severe vertebral osteoporosis after pregnancy and during lactation are described. These patients shared several features: a low-calcium diet during most of their lives, very-low body weight in two patients, and a positive family history of osteoporosis in two patients. Initial studies disclosed vertebral fractures, severely diminished bone mineral density of the spine ( Z score = −3.3 to −4.1), and a less severely affected bone mineral density of the hip ( Z score = −1.6 to −2.3). During the prolonged follow-up of these patients, treated with oral biphosphonates, vitamin D, and calcium, an improved clinical response with a marked recovery of spine bone mineral density was observed. Poor general nutrition, low calcium intake, and a positive family history of osteoporosis appear to be strong risk factors for pregnancy- and lactation-associated osteoporosis. Although the mechanism of action is uncertain, calcium, vitamin D, and antiresorptive agents may have been beneficial in the treatment of this severe disorder.
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