Post-pregnancy osteoporosis; a syndrome?
Nordin and Roper's 1955 Lancet report described four young women who developed back pain and vertebral compression fractures during or soon after pregnancy, distinguishing the disorder from osteomalacia and proposing an early explanation for what is now discussed as pregnancy and lactation-associated osteoporosis.
What the study did and found
B. E. C. Nordin and A. Roper's 1955 article “Post-pregnancy osteoporosis; a syndrome?” described four young women who developed backache and vertebral compression fractures during or soon after pregnancy. The report stated that their calcium and vitamin D intake did not appear inadequate, while biochemical and X-ray findings supported osteoporosis rather than osteomalacia. The authors suggested increased adrenocortical activity during pregnancy as a possible cause. Recovery appeared spontaneous, although two women received testosterone and oestrogens and one received methyl androstenediol. The report was a small clinical case series, so it could describe the pattern but could not establish a cause or treatment effect.
Why it is cited
The paper remains relevant historically because it is an early clinical description of severe bone fragility associated with pregnancy. Later reports on pregnancy- and lactation-associated osteoporosis have cited the 1955 Lancet paper when tracing recognition of the condition and its characteristic vertebral fractures.
The condition is now generally discussed as pregnancy and lactation-associated osteoporosis (PLO). Modern reviews describe it as rare and multifactorial rather than attributing it to a single established hormonal mechanism. Reported risk factors include low body mass index, family history, reduced earlier-life physical activity and, in some women, variants affecting bone pathways such as LRP5 or WNT1. Most evidence still comes from case reports, case series and observational studies, and comparative treatment data remain limited. The 1955 adrenocortical explanation should therefore be read as an early hypothesis, not a confirmed mechanism.
The topic today
Today, PLO is recognised mainly when fragility fractures occur in late pregnancy or during the postpartum and lactation period, with vertebral fractures the most frequently reported presentation. Bone density often improves after pregnancy and weaning, but recovery and future fracture risk vary. Management is individualised and may include correction of calcium and vitamin D insufficiency, decisions about breastfeeding, investigation for secondary causes and, in selected cases, osteoporosis medication. Recent systematic reviews emphasise that stronger prospective and controlled evidence is still needed to guide treatment and recurrence counselling.