Predicting post treatment spinal strength and flexibility in work-disabled low back pain patients

This study examined whether posttreatment trunk strength and flexibility could be predicted from initial trunk strength and flexibility, age, gender, pain severity, diagnosis, length of work disability, return-to-work expectations, anxiety, and fear of reinjury among a group of 96 injured workers with chronic occupational low back pain who completed a multidisciplinary work rehabilitation program. The results indicate that initial average torque in trunk extension, age, gender, and average pain severity contribute significantly to prediction of final average torque in trunk extension. Initial average torque in trunk flexion, age, and gender contributed significantly to prediction of final average torque in trunk flexion, and age and initial range of motion contributed significantly to the prediction of final trunk range of motion. The results indicate that prediction of trunk strength and range of motion can be accomplished from measures of trunk strength and flexibility and pain obtained prior to the onset of rehabilitation. Psychological measures were not predictive of posttreatment trunk strength and flexibility. The ability to predict posttreatment trunk strength should facilitate clinical decision making in these complex cases.     

Specified diagnosis in 532 cases of back pain

In the city of Malmö, Sweden, a project was started to improve the rehabilitation of patients with back pain. Among 532 patients with back pain who were on sick leave for an average of 98 days the year preceding the consultation, very few specific diagnoses were made in spite of a thorough clinical and radiological examination. Only five of the patients were cured by surgery. During the same period 103 patients were operated on for disc herniation or nerve root stenosis at the Orthopaedic Department at Malmö General Hospital. Thus the routines for somatic diagnosis of the medical service in Malmö are adequate and an improvement would have very little effect on the expenditures for sick leave and early retirement. As suggested in this paper social and psychological factors are of greater importance in the rehabilitation and we should focus less on the physical problems of the patient.     

An identification of low back pain groups using biobehavioral variables

A multivariate predictive model of low back pain (LBP) was developed. Following a semi-structured interview, 73 participants were assigned to dysfunctional chronic low back pain (DCLBP), functional chronic low back pain (FCLBP), acute low back pain (ALBP), and healthy control (HC) groups. All participants underwent a comprehensive physical, psychophysiological, and psychological evaluation. Multivariate analyses indicated no psychophysiological, few physical, and many psychological differences among the groups. The DCLBP group was found to be most impaired in flexion (p<.001), and the HC group performed the most total work (ft-lb) in extension (p<.001). Psychologically, the DCLBP group displayed greater levels of emotional distress and characterological disturbances and were more functionally impaired (p<.001). Few differences between FCLBP and HC were found. A classification analysis using physical and psychological variables correctly classified 83.3% of DCLBP patients, and it was found that the ALBP group was heterogeneous with some patients having a dysfunctional profile and other patients having a functional profile. The psychological variables were more potent predictors of group membership than were the physical variables. These findings indicate that potential DCLBP and FCLBP patients can be identified shortly following an injury, suggesting important implications for assessment and treatment of low back pain in general, and more specifically, for reducing health care costs and human suffering.     

Industrial back belts and low back pain: Mechanisms and outcomes

The recent increased utilization of industrial back belts as personal protective equipment in the workplace has generated considerable controversy among occupational health and safety professionals in the United States. The purpose of this article is to review the literature regarding proposed mechanisms of action of these devices and studies related to outcome of belt utilization in the prevention of low back pain and disability in the workplace. At the present time, neither the suspected mechanisms of action nor the efficacy of these devices in the primary, secondary, and tertiary prevention of work-related low back pain has been adequately demonstrated in clinical trials. As a result, generally accepted guidelines regarding the safe use of belts in the occupational setting have not been established. Based on this review it is recommended that further well-controlled, prospective, randomized clinical trials are necessary to evaluate the effectiveness of these devices as personal protective equipment. During the interim, the decision to prescribe belts to employees in the workplace should be at the discretion of an adequately trained occupational health care provider. These devices should not be provided as an alternative to appropriate administrative and/or engineering controls.     

Individual and occupational determinants of low back pain according to various definitions of low back pain

OBJECTIVES: To test associations between non-specific low back pain and several risk factors when definitions of low back pain vary. DESIGN/SETTING/PARTICIPANTS: A cross sectional study was set up in 1991, 725 workers from four occupational sectors answered a self administrated questionnaire including the Nordic questionnaire and questions about intensity of pain and individual and occupational factors. MAIN RESULTS: Prevalence of low back pain varied from 8% to 45% according to the definition used. Psychosomatic problems, bending or carrying loads were often associated to low back pain, whereas other risk factors were related to some specific dimensions of the disorder. CONCLUSIONS: Risk factors of low back pain vary with the definition. This could explain inconsistencies found in literature reviews. To be able to compare data, it seems important to be precise what definition is used and to use comparable questionnaires.     

Predictive model to determine cost/benefit of early detection and intervention in occupational low back pain

Low back pain related to work injury has major socioeconomic implications. Theoretically, the early detection of patients at risk for continued work disability after 6 months of work absence, and of those with a recurrence of pain (RP) and leave work once again, should be cost-effective if combined with effective intervention. The objective of this prospective research was to analyze the cost-effectiveness of a detection-intervention system (DIS) developed from a logistic predictive model of work status. A sample of newly injured workers (N=135 males) were assessed following a first episode of compensated low back pain. A predictive biopsychosocial profile was obtained from a series of univariate and multivariate regression analyses. Structural diagnosis, pain rating, length of inactivity before treatment, negative life changes, and self-efficacy expectancies were found to be best predictors. With a correct classification rate of 72% the predictive model parameters (sensitivity and specificity) were chosen in order to reduce the number of false negatives (recurrence of pain or chronic patients not detected). The calculation of the cost/benefit proportions reveals that the detection-intervention system generates savings of up to $39,595 Can./100 patients a year. By combining low treatment expenses ($250 Can to $1,000 Can.) and increasing the success rates (40–75% return to work), the detection-intervention system is potentially more cost effective than the current approach without detection-intervention.     

腰椎稳定性训练对曼性非特异性腰痛患者的治疗效果

目的分析探讨腰椎稳定性训练方法对于慢性非特异性腰痛病人的临床效果。方法将我院于2006-2009年收治的30例慢性的非特异性的腰痛患者作为本组实验的研究对象,将30患者随机分成对照组与实验组各15例,对照组患者进行磁热治疗,实验组患者则采取腰椎稳定性的训练方法进行治疗,对两组患者治疗前后疼痛和功能障碍的程度进行评价。结果两组患者经过相应的治疗,疼痛与功能障碍均有了一定的改善,但实验组腰痛患者疼痛与功能障碍的改善情况同对照组相比更加明显,P〈O．05。结论腰椎稳定性训练方法是治疗慢性非特异性腰痛的一种有效方法,可以减轻患者的疼痛程度,改善患者的功能障碍,具有很高的临床应用价值。     

Interrelations of risk factors and low back pain in scaffolders

OBJECTIVES—To assess with a cross sectional study the interrelations between physical, psychosocial, and individual risk factors and different end points of low back pain.
METHODS—In total, 229 scaffolders and 59 supervisors completed a questionnaire about manual handling of materials, awkward back posture, strenuous arm position, perceived exertion, psychosocial load, need for recovery, and general health. Physical load at the worksite was also measured with many frequent observations. Interrelations between risk factors and their relation with four end points of low back pain were investigated.
RESULTS—Interrelations were strong among self reported determinants of physical load but showed an inverted trend for both age and total working experience, which could indicate the presence of a healthy worker effect. Weak relations existed between variables of psychosocial and physical load. The multivariate analyses showed a significant relation between high manual handling of materials, moderate perceived general health, high job demands, and low back pain in the past 12 months. Chronic low back pain was significantly correlated with high perceived exertion and moderate perceived general health. Severe low back pain was significantly correlated with awkward back postures, high need for recovery, and high job demands. Finally, low back pain with perceived disability was significantly related to strenuous shoulder positions and moderate perceived general health. All end points of low back pain were consistently associated with physical load whereas psychosocial aspects showed a more diverse pattern.
CONCLUSIONS—The findings of this study suggest that work related risk factors may vary according to different definitions of low back pain. Distinct patterns of risk factors might enhance different expressions of it. Scaffolders are a group at high risk of developing persistent forms of low back pain.


Keywords: interrelations; low back pain; risk factors     

Changes in psychopathology following functional restoration of chronic low back pain patients: A prospective study

Past research has consistently demonstrated high rates of psychopathology in patients disabled with chronic low back pain. The purpose of the present study was to evaluate whether functional restoration treatment of these patients would lead to significant changes in psychopathology. Fifty-six patients were evaluated for current psychiatric disorders, using a structured clinical interview for DSM-III-R disorders, upon admission to a comprehensive 3 week functional restoration program, and again at 6 months following their rehabilitation. Results clearly documented significant decreases in prevalence rates of psychiatric disorders, particularly somatoform pain disorder and major depression. Such findings demonstrate that effective rehabilitation can significantly decrease the high rates of psychopathology commonly found in chronic low back pain patients.     

Health economic assessment of behavioural rehabilitation in chronic low back pain: a randomised clinical trial

The aim of this cost-effectiveness study was to compare a combined operant programme plus cognitive/relaxation programme with an operant programme plus attention-control and to compare both programmes with a waiting-list control group and with operant rehabilitation provided, as usual, by the same rehabilitation centre. One hundred and forty eight patients with chronic low back pain were randomly assigned to the different conditions. The economic endpoints were the costs of the programme and other health care utilisation, costs for the patient, and indirect costs associated with production losses due to low back pain. The effects were measured in terms of global assessment of change and utilities, using rating scale and standard gamble methods. The 3-year study determined that adding a cognitive component to an operant treatment did not lead to significant differences in costs and improvement in quality of life when compared with the operant treatment alone. Compared with the common individual rehabilitation therapy it can be concluded that the same effects can be reached at the same or lower costs with a shorter, more intense standardised group programme. The operant treatment alone is more effective than providing no treatment in the waiting-list control group. © 1998 John Wiley & Sons, Ltd.     

Involving users in low back pain research

Objective To involve users in the design of a research project that aims at describing a 12‐month course of low back pain in an adult population sample (epidemiological strand), and to determine how patient and professional perceptions of low back pain and its treatment relate to the use of health‐care and to subsequent outcome (qualitative strand). Design Three focus groups were organized in the preparatory phase of the project with general practitioners, other health professionals and low back pain sufferers. Issues pertaining to the experience of living with, or treating low back pain were explored and users were asked to identify relevant research questions for consideration within the study. Findings The focus groups revealed tensions between involving users as co‐researchers for design issues and their role as sufferers and health professionals who want to share their narrative accounts of low back pain. The group discussions produced a wealth of material for analysis, but no explicitly stated research topics. Three key themes and the process of user involvement in the focus groups are discussed. Conclusions The focus group format could be restrictive in that it allows for detailed exchange between participants, but is insufficiently geared towards the production of a research agenda. We draw conclusions as to possible approaches for user involvement in health services research design.     

Prevalence of psychopathology in acute and chronic low back pain patients

This study assessed the differential prevalence rates of psychopathology in chronic and acute low back pain patients. Psychopathology was assessed with the Structured Clinical Interview for the DSM-III-R (SCID). The results showed that chronic low back pain patients (n=90), had much higher rates of psychopathology than did patients in the acute back pain group (n=90), and much higher than general population base rates. In particular, chronic low back pain patients had high rates of major depression, substance abuse, and personality disorders. Moreover, the chronic low back patients also had high rates of premorbid psychopathology. It was concluded that psychopathology is a major concomitant of chronic low pack pain, and that treating the psychological problems, along with the physical aspects of the chronic low back pain may increase the patient's chance of a successful therapeutic outcome.     

A comparison of two lifting assessment approaches in patients with chronic low back pain

The Progressive Isoinertial Lifting Evaluation (PILE) and the lifting test of the WorkWell Systems Functional Capacity Evaluation (WWS) are well known as lifting performance tests. The objective of this study was to study whether the PILE and the WWS can be used interchangeably in patients with Chronic Low Back Pain (CLBP) and to explore whether psychosocial variables can explain possible differences. Methods: 53 Patients (32 men and 21 women) with CLBP were tested twice in a counter balanced design. Pearson Correlation Coefficient of r > 0.75 and non-significant differences on two-tailed t tests were considered as good comparability. Results: Pearson Correlation Coefficient was 0.75 (p < 0.01). Lifting performance on the WWS was a mean of 6.0 kg higher compared to the PILE (p < 0.01). The difference between the PILE and the WWS was unrelated to psychological variables. Conclusion: It can be concluded that the PILE and the WWS cannot be used interchangeably. Psychosocial variables cannot explain the differences between both tests.     

Occupational low back pain: Recovery curves and factors associated with disability

Review of the literature shows significant variation in the rates of recovery from an episode of low back pain (LBP). Two hundred and seven workers filing a “First Report of Injury” form with the Vermont Department of Labor and Industry were contacted 3 months post-injury to determine time until first return-to-work, work status, lost workdays, and factors such as pain intensity and satisfaction with health care. Overall, 69.4% of the workers had first returned to work within 1 week, 85.9% within 1 month, and 93.7% by 3 months. Three months post-injury, 8.7% of these workers were not working (disabled) due to their LBP. On a scale of 0–10, the disabled reported substantially more pain in the past few days (p=.0001) and a higher level of “worst pain since injury” (p=.004). Those disabled were less likely to feel they had received the right treatment for their LBP (p=.05). Researchers and clinicians need a clear understanding of recovery curves to assess the effectiveness of any interventions.     

Living with opioids: A qualitative study with patients with chronic low back pain

BackgroundOpioids are one of the most prescribed treatments for chronic pain (CP). However, their long‐term use (>3 months) has been surrounded by controversy, due to loss of beneficial effects.ObjectiveTo explore the experiences of people with chronic non‐malignant low back pain in Spain undergoing long‐term treatment with opioids.DesignQualitative study.Setting and participantsWe conducted 15 semi‐structured interviews at the Pain Clinic with persons taking opioid treatment.MethodsThe interviews were analysed by qualitative content analysis as described by Graneheim and Lundman, and developed categories and themes discussed in light of a biomedicalization framework.Main resultsWe developed one overarching theme—Living with opioids: dependence and autonomy while seeking relief—and three categories: The long pathway to opioids due to the invisibility of pain; Opioids: from blind date to a long‐term relationship; and What opioids cannot fix.DiscussionThe long and difficult road to find effective treatments was a fundamental part of coping with pain, involving long‐term relationships with the health system. This study reflects the benefits, and drawbacks of opioids, along with struggles to maintain autonomy and make decisions while undergoing long‐term treatment with opioids. The paper also highlights the consequences of pain in the economy, family and social life of patients.ConclusionsPatients'' experiences should be considered to a greater extent by health‐care professionals when giving information about opioids and setting treatment goals. Greater consideration of the social determinants of health that affect CP experiences might lead to more effective solutions to CP.     

Return to work following back surgery: a review

Nineteen articles published between 1980 and 1986 were reviewed to determine the prognosis for returning to previous employment following back surgery. Seventy-seven percent of the cases reviewed returned to their previous level of employment. Nearly 11% of cases had additional back surgery during the period of follow-up. Data from three articles suggest that 82% of patients are able to return to their previous level of employment following primary back surgery compared to 59% of patients who have had multiple back surgeries. Recommendations for work activity following back surgery should be individualized for each patient. A work-hardening program including assessment of cardiovascular fitness and task performance can be used to progressively increase activity to the highest achievable level. Prevention of back injuries in the workplace will increase employee morale and reduce employee turnover and workers' compensation costs.     

Comprehensive treatment approach for lower back workers' compensation injuries

A clinical outcome follow-up comparison of treatment and non-treatment groups was conducted to investigate the clinical effectiveness of a hospital-based occupational rehabilitation program. Twelve-month follow-up data were collected on 44 patients participating in a comprehensive treatment program and 20 patients referred for treatment but denied participation by their workers' compensation insurance company. Outcome data indicate that the population of workers' compensation low back injured patients who participated in occupational rehabilitation treatment subsequently were more likely to return to employment, consumed fewer analgesics, required fewer hospitalizations for additional diagnostics and/or treatment, and required fewer additional surgeries than a comparison group of patients denied comparable treatment.     

Cohort study of occupational risk factors of low back pain in construction workers

OBJECTIVES—To identify work related risk factors of future low back pain (LBP) in a cohort of construction workers free of LBP at the start of follow up.
METHODS—The Hamburg construction worker study comprises 571 male construction workers who have undergone two comprehensive interview and physical examination surveys. A cohort of 285 subjects without LBP at baseline was identified. After a follow up of 3 years, the 1 year prevalence of self reported LBP was determined in the 230 men followed up (80.7%). Prevalence ratios (PRs) with 95% confidence intervals (95% CIs) of LBP at follow up according to self reported work tasks of construction workers measured at baseline were estimated from Cox's regression models which were adjusted for age, and anthropometric measures.
RESULTS—At follow up 71 out of 230 workers (30.9%) reported LBP during the preceding 12 months. Four work tasks (scaffolding, erecting roof structures, sawing wood, laying large sandstones) with an increased risk of 1 year prevalence of LBP at follow up were further evaluated. After further adjustment for occupation the relative risk was increased for workers who had reported 2 hour/shifts laying large sandstones (PR=2.6; 95% CI 1.1 to 6.5). Work load of bricklayers was additionally estimated by an index on stone load (high exposure: PR=4.0; 95% CI 0.8 to 19.8), and an index for laying huge bricks/blocks (yes/no: PR=1.7; 95% CI 0.5 to 5.7).
CONCLUSIONS—The results suggest that self reported differences in brick characteristics (size and type of stone) and temporal aspects of the work of bricklayers (average hours per shift laying specified stones) can predict the future prevalence of LBP. The data have to be interpreted with caution because multiple risk factors were tested.


Keywords: construction industry; cohort studies; low back pain     

Predicting the long term course of low back pain and its consequences for sickness absence and associated work disability

Background

Low back pain is characterised by a dynamic pattern of episodes and recovery but little is known about the long term course of back pain due to lack of cohort studies with sufficiently long follow up periods.

Methods

A cohort of 523 workers in nursing homes and homes for the elderly was followed for two years. Physical load was measured by observations at the workplace. Psychosocial factors at work, individual characteristics, and low back pain were determined by questionnaire once a year. The effect of work load on low back pain and the transition of low back pain into sickness absence was calculated with logistic regression analysis. A Markov model was used to construct a hypothetical cohort of workers with follow up of 40 years (40 cycles of 1 year) with transitional probabilities between no complaints, low back pain, and sickness due to low back pain. Permanent disability was used as end state of health.

Results

The transitional probability from no complaints to low back pain varied between p = 0.25 and p = 0.29, from low back pain to sickness absence between p = 0.09 and p = 0.25, and recurrence of sickness absence varied between p = 0.27 and p = 0.50, depending on the level of physical load. During a 40 year career, total sickness absence due to low back pain was approximately 140 weeks (6.6%) among workers with high physical load and about 30 weeks (1.4%) among those with low physical load.

Conclusion

The Markov approach illustrated the potential impact of physical load on (permanent) disability due to low back pain among workers with exposure to physical load. These consequences may go unnoticed in cohort studies with follow up periods of a few years.     

Effects of driving on low back pain

BACKGROUND: Many previous studies have demonstrated that driving a car is a risk factor for low back pain (LBP). We have frequent contact with medical representatives who often drive cars for business, and have noticed that many of them suffer from LBP. AIMS: To investigate how driving affected the occurrence of LBP in medical representatives. METHODS: Questionnaire survey of all medical representatives working in Mie Prefecture (Japan). RESULTS: A total of 551 medical representatives replied (92%). We divided the subjects into Group A (with LBP) and Group B (without LBP). There was no significant difference in mean age, height, weight or duration of continuous employment between the two groups. Mean total mileage was 342 539 km in Group A and 251 945 km in Group B (P < 0.05). There was no significant difference in estimated daily mileage or estimated daily driving time between the two groups. As for backrest inclination, most of the respondents in Group A chose 105 degrees and the majority in Group B chose 120 degrees (P < 0.001). CONCLUSION: The total mileage was significantly higher in Group A than in Group B. We considered that the risk for LBP increased as the lumbar spine load accumulated day by day while driving a car almost every day without a holiday.