• Alfred Schmitz, Goetz Lutterbey, Lars von Engelhardt, Marcus von Falkenhausen, and Michael Stoffel.
• Department of Orthopaedic Surgery, University of Bonn, Germany. a.schmitz@uni-bonn.de
• J Manipulative Physiol Ther. 2005 Oct 1; 28 (8): 633-6.

ObjectiveTo present the rare case of a displaced odontoid fracture after manipulative treatment.Clinical FeaturesA 37-year-old, 15-week pregnant patient was referred with acute neck pain and a diffuse paravertebral swelling that started after cervical manipulation performed by her general medical practitioner 5 days before. Because of pregnancy, a cervical spine radiographic series was not obtained before treatment. Magnetic resonance imaging revealed a displaced odontoid fracture associated with a pathological process in the vertebral body of C2 and a paravertebral hematoma on the left side from C2 to C4.Intervention And OutcomeAfter initial halo vest immobilization, an anterior-posterior fusion of C1-C2 was performed. The histological analysis showed features of an aneurysmal bone cyst. The patient was discharged and had an undisturbed pregnancy and was without any neurological complications.ConclusionsBecause of the weakening lesion in C2, the spinal manipulation most likely caused the displaced odontoid fracture. Special imaging should be performed, preferably with magnetic resonance imaging, when a patient experiences significant new symptoms after cervical manipulation.

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