Conservative treatment of lumbar disc disease: patient's quality of life compared to an unexposed cohort.

BACKGROUND

Lumbar disc disease is a very common condition with a substantial socioeconomic impact. Studies have shown the importance of a multilevel assessment of this disease, as its course is influenced by many factors. Most follow-up studies use the degree of physical impairment to measure the outcome of a certain treatment. This remains unsatisfactory, as physical impairment itself seems to be influenced by the social, psychological and personal condition of a patient. We believe that an overall quality of life assessment is required to evaluate success of treatment. The SF-36 questionnaire seemed appropriate, as it provides consistent data of a patient's overall health status. To ensure measurement of disability due to back pain we combined the SF-36 with the NASS (North American Spine Society) questionnaire, an instrument specific for lumbar spine disorders.

METHOD

One year after the last outpatient consultation in our neurosurgical clinic, a SF-36 questionnaire was sent to 636 patients with conservatively treated lumbar disc disease. We used the Mann Whitney Test to compare patient's data with a standard group. The demographics of the standard group were matched with the study cohort.

FINDINGS

A total of 486 patients (66.5% males and 33.5% females), mean age 49 years (range 21-82 years), returned the questionnaire. The SF-36 data was usable in 76.4% of the patients. Statistical testing reported a significant impact of the disease on all 8 items of the SF-36 questionnaire. The "Role Functioning - Physical (RF)" item was the most, the "Mental Health (MH)" item the less affected. No statistical difference was found between males and females regarding the impact on single items. The NASS scores were also affected suggesting that lumbar back disorder was the influencing factor for the low SF-36 scores.

CONCLUSIONS

Besides impairment in the execution of daily physical tasks, patients with lumbar disc disease also showed a significant impact on the "Mental Health (MH)" item. Early SF-36 assessment could identify subjects with high probability of prolonged recovery and development of chronic pain syndromes. In these patients, an early rheumatologic, rehabilitative and psychiatric treatment might be the key to improve their coping abilities and should become an integral part of the treatment strategy.