Alteration of symptoms related to position have led authors to think that imaging in the most symptomatic position might yield more diagnostic information than imaging in a psoas relaxed neutral position. Typically, these patients experience fewer symptoms when bending forward, squatting, or lying supine with hip flexion.

The symptoms are often induced by walking, standing, or hip extension. Stenosis of the lumbar spinal canal may cause low back pain, sciatica, and neurogenic claudication. Treatment was not changed from surgical to medical management for any of the patients when shown the axially loaded images.ĬONCLUSION: In selected patients with spinal stenosis and apparent narrowing of the spinal canal shown by axially loaded MR imaging, the additional information gained from this technique can influence experienced neurosurgeons in their treatment decisions. For two other patients, two neurosurgeons changed their treatment decisions, and for three additional patients, one neurosurgeon changed his treatment decision, all based on the axially loaded MR images.

For this selected group of patients, all three neurosurgeons changed their treatment decision from conservative management to decompressive surgery for five patients when shown the axially loaded MR images. RESULTS: Axial loading during MR imaging of the lumbar spine can influence neurosurgeons in their treatment decisions for symptomatic spinal stenosis. The same neurosurgeons were then asked for second treatment decisions based on the same clinical information but with axially loaded MR images. Three experienced neurosurgeons evaluated these 20 patients based on clinical information and routine MR images. We selected 20 of these patients because they had narrowing of the spinal canal shown on the axially loaded images. METHODS: Two hundred patients with clinical symptoms of spinal stenosis underwent routine MR imaging and then immediately underwent axially loaded MR imaging. The purpose of this study was to determine whether the narrowing of the spinal canal with axial loading during MR imaging could influence treatment decision for spinal stenosis. However, the clinical significance is unclear. BACKGROUND AND PURPOSE: Previous studies have shown that axial loading can narrow the spinal canal.