Health outcome assessment before and after lumbar laminectomy for radiculopathy

Restless leg syndrome and sleep quality in lumbar radiculopathy patients

Background. To investigate the frequency of restless leg syndrome (RLS), sleep quality impairment, depression, fatigue, and sleep behavior disorder and to determine the effects of surgery on these parameters in radiculopathy patients resistant to conservative treatment. Methods. The present study included 66 lumbar radiculopathy patients, who were resistant to conservative treatment and had indication of surgery. Five different questionnaires were performed to assess depression (the Beck Depression Inventory (BDI)), sleep quality (the Pittsburgh Sleep Quality Index (PSQI)), fatigue (the Fatigue Severity Scale (FSS)), and presence of RLS and rapid eye movement sleep behavior disorder (RBD). The same questionnaires were also performed on a control group (n = 61). Results. Of the radiculopathy patients, 68.1% had RLS and 92.4% had fatigue. Of the controls, 16.4% had RLS and 59% had fatigue. RBD was present in 8 (12.1%) patients and 3 (4.9%) controls. The PSQI revealed that sleep quality was impaired in 46 (69.7%) patients and 35 (57.4%) controls (P > 0.05). The number of individuals having substantial depression according to the BDI was significantly higher in the patients than in the controls. Conclusions. There was a significant increase in the frequency of RLS, which was significantly decreased in the postoperative period in the radiculopathy patients.

Cost-utility analysis of routine neurosurgical spinal surgery

OBJECT

Cost-utility analysis is currently the preferred method with which to compare the cost-effectiveness of various interventions. The authors conducted a study to establish the cost-utility results of routine neurosurgery-based spinal interventions by examining patient-derived values.

METHODS

Two hundred seventy patients undergoing surgery for cervical or lumbar radicular pain filled in the 15-dimensional health-related quality of life (HRQOL) questionnaire before and 3 months after surgery. Quality-adjusted life years (QALYs) were calculated using the utility data and the expected remaining life years of the patients. The mean HRQOL score (scale, 0-1) increased after cervical surgery (169 patients, mean age 52 years, 40% women) from 0.81 +/- 0.11 preoperatively, to 0.85 +/- 0.11 at 3 months, and after lumbar surgery (101 patients, mean age 54 years, 59% women) from 0.79 +/- 0.10 preoperatively, to 0.85 +/- 0.12 at 3 months (p < 0.001). Of the 15 dimensions of health, improvement in the following was documented in both groups: sleeping, usual activities, discomfort and symptoms, depression, distress, vitality, and sexual activity (p < 0.05). The cost per QALY gained was Euro 2774 and 1738 for cervical and lumbar operations, respectively. In cases in which surgery was delayed the cost per QALY was doubled.

CONCLUSIONS

Spinal surgery led to a statistically significant and clinically important improvement in HRQOL. The cost per QALY gained was reasonable, less than half of that observed, for example, for hip replacement surgery or angioplasty treatment of coronary artery disease; however, a prolonged delay in surgical intervention led to an approximate doubling of the cost per QALY gained by the treatment.

The impact of four common lumbar spine diagnoses upon overall health status

BACKGROUND CONTEXT

The Short Form 36 (SF-36) health survey has been shown to be a valid instrument when used to measure the self-reported physical and mental health of patients. The impact of lumbar spinal disorders can be assessed as the difference between the SF-36 scale scores and age- and gender-specific population norms.

PURPOSE

To establish the impact upon the self-reported health status of patients with one of four common lumbar spinal diagnoses.

STUDY DESIGN

A cross-sectional, observational assessment of the health status of spine patients.

METHODS

Data from patients presenting to the participating centers of the National Spine Network with low back pain or leg pain were collected prospectively using the Health Status Questionnaire 2.0. A database search identified patients with either herniated nucleus pulposus with radicular pain (HNP), lumbar spinal stenosis without deformity (SPS), degenerative spondylolisthesis (DS), and painful disc degeneration/spondylosis (DDD). The mean SF-36 scale scores were generated for each of the diagnostic groups. The impact of these diagnoses on health status was determined as the calculated difference from the age- and gender-specific population norms for each of the eight health scale scores. These scores, usually negative in this population, represent how far below normal these patients are. The analysis was stratified according to the age of the patients (<40 years, 40-60 years, >60 years). Analysis of variance and pair-wise comparison with Bonferroni correction were used to assess the significance of differences across diagnosis and age groups.

RESULTS

Data from a total of 4,442 patients were available for this study. All four diagnostic groups had large, negative impact scores for the eight general health scales with the greatest impact upon the three scales that best measure physical health. The greatest impact on these physical health scales (physical functioning, role-physical, and bodily pain) was seen in the HNP diagnostic group. The younger age groups (<40 years and 40-60 years) had the greatest physical impairment when compared with the age- and gender-specific population norms. Analysis of variance showed a significant relationship between diagnosis and SF-36 scores, and between age groups and SF-36 scores.

CONCLUSIONS

All four lumbar spine disorders have a significant negative impact on all eight of the SF-36 scales. The greatest negative impact was seen in those scales that measure physical health (role limitations due to physical symptoms [RP], physical functioning [PF], and bodily pain [BP]). The HNP diagnostic group experienced a significantly greater impact upon these three scales. This diagnostic group had the youngest patients, whose baseline physical functional status would be expected to be the most optimal. When we stratified by age in all the diagnostic groups, the greatest negative impact scores for physical health were seen in the <40 years and 40-60 years age groups. These patients were also more likely to perceive their health as poor, experience decreased energy, and have more social impairment when compared with their age/gender norms.

Quality of life assessment before and after lumbar disc surgery

BACKGROUND

Although operative treatment for lumbar disc herniation is a commonly performed neurosurgical procedure, no reports have described whether health-related quality of life before surgery affects the operative treatment outcome. This prospective study assessed health-related quality of life before and after surgery and evaluated the predictor variables affecting outcomes.

METHODS

Subjects were 45 consecutive candidates for lumbar disc herniation surgery who gave informed consent. The Medical Outcomes Study Short Form 36 (SF-36) and 15-point Japanese Orthopaedic Association (JOA) score were evaluated before and after surgery, and the magnitude of the effect was calculated. The possible predictor variables for outcomes were physical functioning, role physical, bodily pain, general health, vitality, social functioning; role emotional and mental health from the SF-36 subscales; subjective symptoms and clinical signs from the JOA scores; and the patient's age, sex, occupation, and history of low back pain and/or leg pain.

RESULTS

Four patients were excluded from the analyses because they were lost to follow-up within 1 year after operation. All subscales of the SF-36 and JOA scores increased significantly at 6 months and 1 year of follow-up with a maximum effect size in bodily pain and a minimal in general health. Operation results were 29 good, 11 fair, and 1 poor. The selected predictor variables affecting the outcomes were patient age and social functioning on SF-36.

CONCLUSIONS

Surgery for lumbar disc herniation improved health-related quality of life. Patients <50 years old with a <60 score in social functioning on SF-36 were considered good candidates.

Cross-cultural adaptation and validation of the NASS outcomes instrument in Spanish patients with low back pain

OBJECTIVES

The aim of the study was to evaluate validity, reliability, responsiveness and practicality of the NASS-AAOS (North American Spine Society--American Academy of Orthopaedic Surgeons) questionnaire in patients with low back pain.

METHODS

The sample included 70 patients with herniated disk, stenosis, chronic low back pain of unknown etiology or acute low back pain. They were assessed twice before treatment (test--retest) and a third measure six months to one year afterwards.

RESULTS

The mean time of administration was 24 and 20 min for the test and post-treatment evaluation, respectively. Cronbach's alpha coefficient was between 0.78 and 0.92 on the baseline test and 0.90 or higher on the post-treatment evaluation. The test--retest reproducibility was 0.95 (0.91--0.98) for 'neurological symptoms', 0.82 (0.63--0.91) for 'pain/disability' and 0.63 (0.25--0.82) for 'expectations'. The associations with other measures and clinical criteria were generally moderate to high and in the expected direction. The effect size for 'pain/disability' in combination with 'neurological symptoms' was 2.02 for patients who improved versus an effect of -0.09 in patients who were stable between test and retest; the area under the curve on this joint scale was 0.81 (0.69--0.90).

CONCLUSIONS

The instrument is valid, sensitive to clinical changes and reliable for comparisons between groups, but further study is needed for its application in monitoring individual patients.

Prognosis of Multifactorial Outcome in Lumbar Discectomy

OBJECTIVES

Although previous research has shown that certain medical data and psychosocial factors predict postoperative pain, it remains unclear whether they also contribute to a more distinct outcome measure that is based on classification of self-reported outcome criteria. To assess the prognostic power of somatic, psychologic, and social predictors when evident outcome criteria of surgical treatment are investigated, this study used a prospective longitudinal design examining preoperative factors associated with outcome six months after lumbar discectomy.

METHODS

Forty-eight out of 58 consecutive patients were included (60% male, 40% female, mean age 47 years). Preoperative data comprised of Lasegue sign (straight leg raising test), pain duration, paresis and radicular distribution, depression, pain disability, pain coping strategies, and qualitative descriptions of pain. Additionally, sociodemographic and occupational characteristics were observed. Six months' postoperative classification of outcome included pain intensity, pain locations, functional capacity, return to work, and health-related quality of life.

RESULTS

From a surgical point of view, lumbar discectomy was successfully carried out on all patients. But, when subjective criteria of outcome were investigated, 56% of patients benefited from lumbar discectomy, whereas 44% of patients had poor results. Lasegue sign, depression, and sensory pain descriptions proved to be significant predictors, whereas pain cognition and pain coping strategies had no significant influence on evident outcome classification.

DISCUSSION

Classification of patients regarding their individual outcome profiles showed that patients responded differently to lumbar disc-surgery. High risk factors for poor outcome of surgery are Laseque-sign and depression.

El test de Lasègue postoperatorio como factor pronóstico de los pacientes intervenidos de hernia discal lumbar

INTRODUCTION

In patients operated for herniated lumbar disc it could be very useful to develop physical examination criteria that would allow early prediction of medium or long term clinical outcomes. The result of the Lasegue test after surgery depends on the occurrence of recurrent herniated disc and/or scar formation around the nerve root. Previous studies have shown the association between the result of Lasegue test, assessed 4 months after surgery, and the short term functional outcome.

OBJECTIVE

To determine the prognostic value of postoperative Lasegue test in relation with medium term functional and clinical outcomes which were estimated by analyzing the functional grade, employment status, quality of life, reoperation for recurrent disc herniation, and the number of clinical revisions and imaging studies needed during the follow-up.

PATIENTS AND METHODS

243 patients who underwent hemilaminectomy for lumbar herniated disc between 1996 and 2002 were studied. The Lasegue sign was tested 3 months after surgery. A modification of Spangfort's criteria (to measure the functional grade) and the 12-item Short-form health survey (SF-12) method (to measure the quality of life) were used to quantify outcomes at 12, 24 and 36 months after initial surgery.

RESULTS

This investigation has proved the prognostic value of Lasegue test assessed 3 months after initial surgery. A statistically significant correlation was found between a positive straight leg raising test and a poor functional status at 24 and 36 months, and the risk do not return to work because of persistent pain at 12, 24 and 36 months. A statistically significant correlation was also found between the result of the test and the frequency of reoperation for recurrent disc herniation and the number of clinical revisions and imaging control studies needed through the follow-up. Likewise, the prognostic value of Lasegue test on different aspects of quality of life (health perception, functional performances, poor social interaction and severe pain) analyzed at 24 and 36 months after surgery were also confirmed.

CONCLUSION

This study provides additional information about the predictive value of the straight leg raising tested 3 months after surgery on the clinical (diagnostic resources consumption, successive outpatient revisions, etc) and functional (quality of life, functional grade and return to work) outcomes assessed 24 and 36 months after initial surgery.

The reliability and concurrent validity of the scoliosis research society-22 patient questionnaire for idiopathic scoliosis

STUDY DESIGN

Outcome study to determine response distribution, internal consistency, reproducibility, and concurrent validity of the Scoliosis Research Society-22 (SRS-22) health-related quality-of-life (HRQL) questionnaire.

OBJECTIVES

Further refinement of an HRQL questionnaire specific for idiopathic scoliosis.

SUMMARY OF BACKGROUND DATA

Previous experience with the original and modified SRS HRQL questionnaires suggested a need for further refinement and more complete validation.

METHODS

The SRS-22 and Short Form 36 (SF-36) HRQL questionnaires were mailed to 83 previously surveyed postoperative idiopathic scoliosis patients.

RESULTS

Fifty-eight (70%) patients returned the first set of questionnaires. Their average age at surgery was 14.6 years, and their average follow-up interval since surgery was 10.8 years. Fifty-one (88%) of the 58 returned the second set of questionnaires an average of 28 days later. The psychometric attributes of the instruments were comparable: score distribution, SRS-22 56.9% ceiling and 1.7% floor, SF-36 79.3% ceiling and 1.7% floor; internal consistency (Cronbach alpha), SRS-22 0.92 to 0.75, SF-36 0.91 to 0.36; and reproducibility (intraclass correlation coefficient), SRS-22 0.96 to 0.85, SF-36 0.92 to 0.61. Concurrent validity, determined by Pearson Correlation Coefficients between SRS-22 and SF-36 domains, was 0.70 or greater ( < 0.0001) for 17 relevant comparisons.

CONCLUSION

The SRS-22 HRQL questionnaire is reliable with internal consistency and reproducibility comparable to SF-36. In addition, it demonstrated concurrent validity when compared to SF-36. It is shorter and more focused on the health issues related to idiopathic scoliosis than SF-36.

Three-question depression screener used for lumbar disc herniations and spinal stenosis

STUDY DESIGN

A depression screener was used to determine positive responses amongst patients with two disorders commonly treated with surgery.

OBJECTIVE

To examine the relation between positive responses to the depression screener and pain characteristics, sociodemographic responses, and Short-Form 36-Item Health Survey subscale scores among patients with lumbar disc herniation or spinal stenosis.

SUMMARY OF BACKGROUND DATA

Numerous studies have reported a correlation between depression and low back pain, but few have examined this relation among patients with a diagnosis of sciatica from lumbar disc herniation or spinal stenosis. The Health Status Questionnaire 2.0 includes both the Short-Form 36-Item Health Survey (a validated, multidimensional, generic instrument measuring health-related quality of life and functional status) and the three-question depression screener.

METHODS

The database of the National Spine Network (a nonprofit collaboration of physicians caring for patients with back and neck problems that pools patient data) was queried for patients 18 to 65 years of age with a diagnosis of lumbar disc herniation (n = 2878) and patients 30 to 80 years of age with a diagnosis of spinal stenosis (n = 3801). Depression screeners scored positive when patients reported depressive symptoms within the year to any question about symptoms.

RESULTS

The screener elicited positive responses from 36.4% of the patients with spinal stenosis and 38.4% of the patients with lumbar disc herniation. Among the patients with spinal stenosis or lumbar disc herniation, those with positive depression screener responses reported longer duration of symptoms (>7 weeks) and failure to improve. They were more likely to be obese, recipients of workers' compensation, unmarried, and less educated (below Grade 12). In multivariate analyses, positive depression screener responses were significantly associated with an attorney's services and a longer duration of symptoms.

CONCLUSIONS

A positive depression screener response is strongly associated with poorer functional status and health-related quality of life, as measured by the Short-Form 36-Item Health Survey, among patients with lumbar disc herniation or spinal stenosis, and higher symptom intensity.

Transforaminal endoscopic decompression for radiculopathy secondary to intracanal noncontained lumbar disc herniations: outcome and technique

BACKGROUND CONTEXT

In 1973 Kambin and Gellman introduced the concept of percutaneous posterolateral extracanal approach in the management of radiculopathy secondary to lumbar disc herniation (LDH). This new surgical approach was recognized as potentially even less invasive compared with the microscope-assisted transcanal technique. However, the development of the posterolateral extracanal approach has witnessed a slow and complicated technique and equipment evolution.

PURPOSE

To report the surgical outcome, complications and technique of decompressing radiculopathy secondary to noncontained intracanal LDH using percutaneous extracanal access, the transforaminal endoscopic approach.

STUDY DESIGN/SETTING

Consecutive cases of LDHs from L3-S1 who had at least 1-year postoperative follow-up were included in this retrospective review.

PATIENT SAMPLE

Two hundred nineteen patients met inclusion criteria. There were 136 (62.1%) male patients, average age 41.5 years, and 83 (37.9%) female patients, average age 42.5 years. The age range was 17 to 71 years.

METHODS

Two outcome measures were used. The first part was a surgeon-performed assessment. The second used a patient-based outcome questionnaire.

OUTCOME MEASURES

The surgeon's retrospective assessment of excellent, good, fair and poor is a modified MacNab classification. The same terminology is used in the patient-based outcome questionnaire. Poor outcome resulting from technique failure is identified.

RESULTS

Two hundred nineteen patients met the inclusion criteria. One hundred ninety-three patients also send back their completed questionnaire. The surgeon graded 88% percent of the 219 patients had a good or excellent result and the questionnaire subgroup 91.2%. The fair results were 5% of the 219 patients, 3.6% for the questionnaire patients. The poor results were 6.8% of the 219 patients and 5.2% for the questionnaire subgroup. The overall complication rate was 2.7% and missed fragment rate 0.9%.

CONCLUSIONS

Noncontained intracanal LDH fragments are accessible using the transforaminal endoscopic technique and equipment described. Retrospective outcome reviews of our clinical material showed results comparable to the reported findings in the literature for both the endoscopic and open transcanal decompression techniques.

Further development and validation of the Scoliosis Research Society (SRS) outcomes instrument

STUDY DESIGN

Outcome study to determine response distribution, internal consistency, and validity of a Modified SRS Outcomes Instrument (MSRSI).

OBJECTIVES

Refinement and validation of the SRS Outcomes Instrument for idiopathic scoliosis.

SUMMARY OF BACKGROUND DATA

Experience with the SRS Outcomes Instrument suggested several refinements and the need for validation.

METHODS

Following experience-based modification, the Modified SRS Outcomes Instrument and Short Form 36 (SF-36) questionnaires were administered to 35 previously surveyed postoperative idiopathic scoliosis patients.

RESULTS

Thirty (86%) patients with an average age of 25 years returned the questionnaires at an average of 10 years postoperative. Distribution of scores was acceptable. Internal consistency utilizing Cronbach's alpha was 0.80, 0.81, 0.77, 0.89, and 0.88 for pain, self-image/appearance, function/activity, mental health, and satisfaction with surgery, respectively. Validity, determined by Pearson correlation coefficients with comparable SF-36 domains, was 0.70 or greater for 13 of the 14 relevant domains between SF-36 and MSRSI (P < 0.001).

CONCLUSION

The SRS Outcomes Instrument is simple and internally consistent. Based on experience, a number of modifications have been made that improve the instruments scope and internal consistency. Finally, the instrument is valid in comparison to SF-36.

Quality-of-life assessment in acute, chronic, and cancer pain: a pharmacist's guide

OBJECTIVE

To describe instrumentation, or measures, available for use in assessing the impact of pain on the quality of life (QOL) of patients, and methods to evaluate the appropriateness of these QOL measures.

DATA SOURCES

MEDLINE, PSYCHLit, and CANCERLit were searched from 1980 through 1997 to identify QOL instruments that included a pain subscale or pain-related items.

DATA SYNTHESIS

Given the high prevalence of chronic diseases or conditions that include pain as a primary or secondary symptom, pharmacists should understand how pain affects the QOL of patients. Over the past two decades, emphasis has increased on developing instruments that assess health-related QOL concerns, including pain. Scores of measures--including utility measures--are available to measure general QOL in patients with conditions involving pain. Condition-specific instruments have also been developed to measure the impact of specific conditions, such as arthritis, on QOL. Guidelines are presented for evaluating QOL instrumentation, and existing measures used to evaluate the QOL of patients with acute and chronic pain are described. Pharmacists can use these guidelines to evaluate the usefulness of existing instruments for assessing the QOL of patients with pain.

CONCLUSION

Using QOL measures in everyday practice may assist pharmacists in gaining insight into the effects of pain on their patients' QOL. This information may be useful in developing treatment programs that minimize pain and its associated side effects while maximizing patients' well-being.

Health outcome assessment before and after anterior cervical discectomy and fusion for radiculopathy: a prospective analysis

STUDY DESIGN

A prospective assessment, performed using the Health Status Questionnaire, of the outcomes for 28 patients with cervical radiculopathy treated with one- or two-level anterior cervical discectomy and fusion.

OBJECTIVE

To assess patient outcome using the Health Status Questionnaire after one- or two-level anterior cervical discectomy and fusion.

SUMMARY OF BACKGROUND DATA

Although outcomes for many types of surgical procedures already have been evaluated, few have focused on the results of cervical surgery.

METHODS

Before and after anterior cervical discectomy and fusion for cervical radiculopathy, 28 patients filled out the Health Status Questionnaire. The average follow-up interval was 21.8 months. There were 10 men and 18 women, with an average age of 44 years. All outcome instruments were graded for individual scores of general health, physical function, role limitation because of physical health problems, role limitation because of emotional problems, social function, mental health, bodily pain, and energy. Data were analyzed using the age (< 55 vs. > 55), worker's compensation status, and education status of the patient. Preoperative and postoperative scores were compared for each subscale.

RESULTS

Statistically significant improvements were found in postoperative scores for bodily pain (P < 0.001), vitality (P = 0.003), physical function (P = 0.01), role function/physical (P = 0.0003), and social function (P = 0.0004). No significant differences were found before and after surgery for three health scales: general health, mental health, and role function associated with emotional limitations. Age, educational status, and history of compensation litigation did not appear to affect outcome measures.

CONCLUSIONS

Although this is a preliminary report involving 28 patients, it would appear, based on the results of the Health Status Questionnaire, that anterior cervical discectomy and fusion performed on appropriately selected patients is a highly reliable surgical procedure for the management of cervical radiculopathy. Additional disease-specific questions may provide more sensitivity in evaluating radiculopathy after surgical and nonsurgical intervention.

Surgically treated lumbar disc disease in the pediatric population: an outcome study

OBJECT

This outcome study was undertaken to investigate the long-term results obtained in surgically treated pediatric patients with lumbar disc disease by using standardized medical outcome scales and clinical follow-up examination.

METHODS

Twenty nine patients 17 years of age or younger underwent surgery between 1968 and 1998 for lumbar disc disease. The follow-up period ranged from 4 months to 30.5 years (mean 8.5 years). Outcome scores (health profiles) were generated using a standardized medical outcome scale, the Short Form health survey questionnaire (SF-36), and a condition-specific back pain outcome scale. Clinical follow-up data were obtained by telephone interview. The health profile of the study population closely paralleled that of the normal population and was distinctly different from the health profile of adults with low-back pain. Only physical functioning, as measured by a scale of the SF-36, was found to be impaired in a subset of the study population. The rate of reoperation was 24% over the course of the follow-up period. In contrast to similar studies in adults, there were no identifiable predictive factors for either reoperation or poor outcome.

CONCLUSIONS

Lumbar disc disease in the pediatric population does not appear to lead to chronic complaints of back pain, and it does not appear to have a negative impact on overall health. This finding suggests that pediatric lumbar disc disease may be a separate entity distinct from adult lumbar disc disease, and therefore, the same conclusions regarding long-term outcome cannot be applied to the pediatric population.

Measuring quality of life in back patients: comparison of Health Status Questionnaire 2.0 and Quality of Life Inventory

This paper is a reliability and validity test of the Health Status Questionnaire (HSQ) 2.0. In addition, the Quality of Life Inventory (QOLI) is compared with the HSQ 2.0 to assess concurrent validity. The study is unique because these instruments are assessed for the first time using a sample of chronic back patients. Practitioners will therefore now be able to evaluate important quality of life issues and treatment changes in this population. The HSQ 2.0 was generally found to be valid for these patients. However, two scale domains were not differentiated due to unique characteristics of spinal disease patients. The QOLI, due to the limitation of measuring only psychological well-being, did not measure problems specific to back patients.

Functional status and well-being in patients with glaucoma as measured by the Medical Outcomes Study Short Form-36 questionnaire

PURPOSE

This study aimed to determine whether patients with glaucoma have different functional status and well-being than patients without glaucoma.

DESIGN

Prospective case-control study.

PARTICIPANTS

The study population was recruited from 2 university-based glaucoma clinical practices and a university-based general ophthalmology clinic and consisted of 121 patients with open-angle glaucoma, 42 with diagnosis of glaucoma suspect, and 135 with no chronic ocular conditions except cataract.

INTERVENTION

Administration of Medical Outcomes Study 36-item short-form survey (SF-36) was performed. Demographic information, medical history, and responses to the SF-36 questionnaire were elicited by an interviewer. Medical record review was performed to obtain clinical examination data and to substantiate the medical and demographic data obtained by the interviewer.

MAIN OUTCOME MEASURES

The SF-36 scores by diagnostic group, demographic characteristics, and medical history were examined. Secondary outcome measures were SF-36 scores in patients with glaucoma by visual field impairment and glaucoma medication use.

RESULTS

Patients with glaucoma consistently had lower scores, control subjects had higher scores, and glaucoma suspects had scores intermediate between the two groups. After adjusting for the possible influence of all the other covariate factors, glaucoma was found to be a strong predictor of lower SF-36 scores.

CONCLUSION

Patients with glaucoma have lower scores, indicating less-functional status, than patients without glaucoma as tested by the SF-36 survey questionnaire.

Outcome assessment after spinal fusion: why and how?

Outcomes of medical interventions today must reflect a more complete array of measurements, including health status, patient satisfaction, medical costs, and quality of life. This article discusses the rationale and methodology involved with measurement of health status, particularly as it applies to spinal disorders and spinal fusion. Generic and disease-specific instruments are reviewed, and their limitations are also discussed.