[Long-term outcome of monoradicular lumbosacral compression syndromes-a comparison of pain and neurological deficits with lumbar CT scan.].

A total of 97 patients with an acute monoradicular lumbosacral compression syndrome and a herniated disc at the same level were reinvestigated an average of 25 months after the acute event. Assessment was based on CT investigation and "root score", which was compiled from reports of subjective complaints and neurological deficits. All patients had initially undergone conservative treatment as inpatients. At the time of reinvestigation CT examination of the herniated discs revealed that they were unchanged in 56.7%, some-what smaller in 34%, no longer visible in 4.1% and larger in 5.2%. Nevertheless, 53.6% of patients were free of complaints, while 23.7% had improved clinically by more then 75%. The remainder showed improvement by about 25-75%. In no patient was the score unchanged or worse. In 69% of the patients neurological deficits were no longer demonstrable, and the remaining patients were not aware of deficits or did not feel any impairment from deficits that were obvious on clinical example. In 22.7% impairment was caused solely by local radicular or pseudoradicular pain. From these results it can be concluded that herniation of the disc precipitates the acute event but is not the sole source of the pain. In the majority of cases, during the further course of the disease the herniated disc causes no pain. It appears, therefore, that the course of disease following a disc herniation can be influenced very favourably by non-operative treatment and that in more than 50% of cases the condition becomes clinically silent. It follows that in neuroradicular compression syndromes a neurological deficit associated with the acute event does not mean operative intervention is indicated.