Spine
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Over the past 10 years, 231 insufficiency fractures of the sacrum have been reported in the literature. These fractures, which are due to osteopenia, form a distinct subgroup of pathologic fractures. ⋯ Frequency, age, sex, diagnosis, underlying diseases, and associated fractures of the 20 cases of insufficiency fractures of the sacrum are described and compared with those previously reported. Insufficiency sacral fracture as a cause of low-back pain in women older than 55 years of age is concluded to be a clinical entity.