Fragility fractures of the sacrum occur in elderly patients with severe loss of sacral bone mass
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Patients suffering from osteoporosis-associated fragility fractures of the sacrum (FFS; also termed sacral insufficiency fractures) are increasingly observed. They have typical fracture patterns with fracture lines located in the sacral ala. When treating these patients operatively, iliosacral screw loosening is not uncommon. We aimed to study the sacral bone mass in patients presenting with a FFS using 3D statistical models.
Materials and methods
3D models of averaged Hounsfield units (HU) were generated based on CT scans from 13 patients with a unilateral FFS (mean age 79.6 years; 11 females, 2 males). The control group without fractures consisted of 28 males and 32 females (mean age of 68.3 years). A virtual bone probe along the trans-sacral corridors S1 and S2 was taken.
The bone mass distribution in the fractured sacra was similar to the control group, however, with overall lower HU. Large zones of negative HU were located in the sacral ala. In the fractured sacra, the HU in the sacral ala was significantly lower on the non-injured side when comparing to the fractured side (p < 0.001) as well as compared to the non-fractured group (p < 0.001). Low bone mass was observed in sacral body S1 (40 HU) and S2 (20 HU).
The extensive area of negative HU may explain the fracture location in the sacral ala. The low HU in the sacral bodies advocates the use of trans-sacral implants or augmented iliosacral screws to enhance the strength of fracture fixation. The increased HU in the fractured ala could be explained by fracture-asssociated hemorrhage and can be used as a diagnostic tool.
KeywordsSacrum Osteoporosis Sacral insufficiency fracture Fragility fracture Pelvis Statistical model
We acknowledge the support of Dr. Karsten Schwieger. We thank Thomas Heldstab for his technical assistance. This study was partially co-funded by the TK System of the AO Foundation (Davos, Switzerland) and Depuy Synthes (Zuchwil, Switzerland).
Compliance with ethical standards
Conflict of interest
The authors do not have any further conflicts of interests.
The anonymous use of CT data was approved by local ethics committee (Landesärztekammer Rheinland-Pfalz, Mainz, Germany) for the group with fractured sacra. The non-fractured sacra were obtained from the CT database of the AO Research Institute Davos, Davos, Switzerland, registered at the “Eidgenössischer Öffentlichkeits- und Datenschutzbeauftragter”, Bern, Switzerland. All patients agreed to anonymous research use of their CT data.
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