Sacral insufficiency fractures are unexpected causes of inguinal, lower back and buttock pain in elderly women with osteoporosis who have sustained unknown or only minimal trauma. Differential and radiological diagnoses of these fractures are often difficult. Bone scan remains the standard diagnostic tool, but computed tomography or magnetic resonance image may be required to differentiate insufficiency fracture from other diseases such as malignant bone lesion. The fracture usually extends vertically in the sacral ala, parallel to the sacroiliac joints. This distribution suggests that such fractures could be partially caused by weight- bearing transmitted through the spine. We report the treatment of insufficiency sacral fracture in one osteopenic patient who has been confirmed by computed tomography and treated with conservative method that convinced by follow up computed tomography.