• Mel Cusi, Jennifer Saunders, Hans Van der Wall, and Ignac Fogelman.
• Sydney School of Medicine, University of Notre Dame, Fremantle, Australia.
• Eur Spine J. 2013 Jul 1;22(7):1674-82.

PurposeTo establish the sensitivity and specificity of cross-sectional scintigraphy [single photon emission computed tomography (SPECT)] combined with computed X-ray tomography (CT) in the detection of sacroiliac joint (SIJ) mechanical dysfunction and evaluate reproducibility of reporting.MethodsPatients with pelvic girdle pain either on the basis of peri-partum SIJ dysfunction or trauma were included. These patients were imaged with bone scintigraphy with hybrid imaging with SPECT/CT.ResultsThe study group comprised 100 patients (72 females, 28 males). Trauma accounted for 52% and the remainder were patients with peri-partum pain. Average age was 43 years and average length of history was >2 years. The major finding was increased uptake in the upper SIJ and posterior soft-tissues/ligaments. Hybrid imaging had a sensitivity of 95% and specificity of 99%. Positive predictive value was 99% and negative predictive value 94%. Power of the test was 1.0. Reproducibility of the test was good with kappa values of 0.85.ConclusionHybrid imaging with SPECT/CT reproducibly demonstrates metabolic alterations around the SIJ in patients with SIJ dysfunction, which we have termed SIJ incompetence. The condition is more common than previously recognised and frequently occurs after trauma, which has not been reported previously.

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