The New Zealand White (NZW) rabbit is often used as an animal model in posterolateral intrertransverse lumbar fusions [1]. Qualitative measures, such as manual palpation and radiographs, have been used to assess fusion mass [1]. However, an evaluation by sacrifice and biomechanical testing is the gold standard for quantitative data. A non-invasive approach to quantitatively assess the mechanics of spinal fusion could allow longitudinal studies with decreased need for animal sacrifice.

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