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Intervertebral bridging ossifications increase the risk of intravertebral cleft formation following a vertebral

Atsushi Kimura¹, Teruaki Endo², Hirokazu Inoue²

¹Department of Orthopaedics, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan. akimura@jichi.ac.jp.

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society

|June 14, 2015

Abstract

Purpose:

To determine whether the presence of intervertebral bridging ossifications is associated with intravertebral cleft (IVC) formation following a vertebral compression fracture (VCF).

Methods:

Patients with a VCF who received conservative treatment for a minimum of 3 months were recruited over a 3-year period. Baseline radiographs obtained within a month of onset were compared between 50 patients who developed an IVC at 3-month follow-up (IVC group) and 100 patients without an IVC (control group). Intervertebral bridging ossification was defined as complete bridging of the intervertebral space by ossification. The presence of bridging ossification was assessed at each intervertebral level from T9/10 to L5/S. In addition to the absolute levels of bridging ossifications, the level relative to a fresh VCF was recorded.

Result:

The incidence of bridging ossification at levels T9/10 and T10/11 was significantly higher in the IVC group than in the control group. IVC group patients showed a significantly higher incidence of bridging ossification at the second proximal intervertebral segment than those in the control group. IVC group patients also had a significantly greater sagittal wedge angle and a greater local kyphosis angle than control group patients.

Conclusion:

A fresh VCF with bridging ossification at the second proximal intervertebral level is associated with increased risk of IVC formation. Careful observation and strict conservative treatment are recommended in such cases.

Keywords:

Bridging ossification Intravertebral cleft Plain radiograph Risk factor Vertebral compression fracture

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