Researchers examined 140 patients with spondylolysis identified by MRI. The researchers also used a positional MRI to assess the patients’ conditions. They found 15 patients who had anterior instability, 35 who had angular instability and 34 who had posterior instability.
In some cases, all forms could be found together. There was no instability found in 76 patients and radicular symptoms were found more often in patients with one or more instabilities compared with patients without instability, according to the report.
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