Assessment of the sacroiliac joint with computed tomography motion analysis: a diagnostic study of 12 patients
DOI:
https://doi.org/10.2340/17453674.2024.35227Keywords:
Joint motion, Pelvis and acetabulum, Radiological imaging, Sacroiliac joint, SpineAbstract
Background and purpose: Pain in the sacroiliac joint may be caused by abnormal joint motion. Diagnosis is mainly based on clinical tests. The aims of this study were to examine whether low-dose computed tomography with provocation of the hip could detect sacroiliac joint motion, and to study whether provocation of the hip results in greater sacroiliac joint motion in the ipsilateral than in the contralateral sacroiliac joint.
Patients and methods: 12 patients with sacroiliac joint pain were examined with low-dose computed tomography scans of the sacroiliac joint, one with the hips in the neutral position, and one each in provocation with the left or the right hip in a figure-of-4 position. Accuracy was tested by comparing internal rotation of the sacrum with internal rotation in the sacroiliac joint. Motion in the sacroiliac joint was assessed by comparing the position of each of the ilia with the reference, the sacrum. Data is shown as mean with 95% confidence interval (CI).
Results: We observed greater motion in the sacroiliac joint than internally in the sacrum, i.e., 0.57° (CI 0.43–0.71) vs. 0.20° (CI 0.11–0.28). The motion of the geometric center of the moving object for the sacroiliac joint was larger on the provoked side; mean difference 0.17 mm (CI 0.01–0.33), P = 0.04. Corresponding figures for rotation were mean difference 0.19° (CI 0.10–0.28), P < 0.001. Compared with the sacrum, the largest motion was seen at the anterior superior iliac spine; mean difference 0.38 mm (CI 0.10–0.66), P = 0.001.
Conclusion: Provocation in the figure-of-4 position of the hip results in sacroiliac joint motion measurable with computed tomography motion analysis. Provocation of the hip induces larger motion on the ipsilateral than on the contralateral sacroiliac joint.
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Copyright (c) 2024 Grim Olivecrona, Lena Gordon Murkes, Henrik Olivecrona, Paul Gerdhem
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