Predictors of time loss after back injury in nurses

Low back pain among nurses working in clinical settings of Africa: systematic review and meta-analysis of 19 years of studies

BACKGROUND

Nurses in Africa are arguably the most important frontline healthcare workers available in most healthcare facilities, performing a broad range of tasks. Such tasks are considerably presumed in the causation of workload. Nursing is listed among the highly risky professions for developing low back pain. The nursing profession is ranked within the top ten professions which have a great risk of low back pain. Hence, this review aimed to ascertain whether low back pain is a significant concern for nurses in African healthcare facilities.

METHODS

A comprehensive literature search of different databases with no date limit was conducted from September to November 2018 using the PRISMA guideline. The quality of the included studies was assessed using a 12-item rating system. Subgroup and sensitivity analyses were performed. Cochran's Q and the I2 test were used to assess heterogeneity. The presence of publication bias was evaluated by using Egger's test and visual inspection of the symmetry in funnel plots.

RESULT

In this review, 19 studies from different African regions with a total sample size of 6110 nurses were included. All the studies were carried out between 2000 and 2018. Among these, the lowest and the highest prevalence were found to be 44.1 and 82.7% respectively. The estimation of the prevalence rate of low back pain among nurses using the random-effects model was found to be 64.07% (95% CI: 58.68-69.46; P-value < 0.0001). Heterogeneity of the reviewed studies was I2 = 94.2% and heterogeneity Chi-squared = 310.06 (d.f = 18), P-value < 0.0001. The subgroup analyses showed that the highest prevalence of LBP among nurses was from West African region with prevalence rates of 68.46% (95% CI: 54.94-81.97; P-value < 0.0001) and followed by North Africa region with prevalence rate of 67.95% (95% CI: 55.96-79.94; P-value < 0.0001).

CONCLUSION

Even though the overall prevalence of the present study is lower when compared to the Western and Asian studies, it indicated that the prevalence of low back pain among nurses is substantial.

Individual recovery expectations and prognosis of outcomes in non-specific low back pain: prognostic factor review

BACKGROUND

Low back pain is costly and disabling. Prognostic factor evidence can help healthcare providers and patients understand likely prognosis, inform the development of prediction models to identify subgroups, and may inform new treatment strategies. Recent studies have suggested that people who have poor expectations for recovery experience more back pain disability, but study results have differed.

OBJECTIVES

To synthesise evidence on the association between recovery expectations and disability outcomes in adults with low back pain, and explore sources of heterogeneity.

SEARCH METHODS

The search strategy included broad and focused electronic searches of MEDLINE, Embase, CINAHL, and PsycINFO to 12 March 2019, reference list searches of relevant reviews and included studies, and citation searches of relevant expectation measurement tools.

SELECTION CRITERIA

We included low back pain prognosis studies from any setting assessing general, self-efficacy, and treatment expectations (measured dichotomously and continuously on a 0 - 10 scale), and their association with work participation, clinically important recovery, functional limitations, or pain intensity outcomes at short (3 months), medium (6 months), long (12 months), and very long (> 16 months) follow-up.

DATA COLLECTION AND ANALYSIS

We extracted study characteristics and all reported estimates of unadjusted and adjusted associations between expectations and related outcomes. Two review authors independently assessed risks of bias using the Quality in Prognosis Studies (QUIPS) tool. We conducted narrative syntheses and meta-analyses when appropriate unadjusted or adjusted estimates were available. Two review authors independently graded and reported the overall quality of evidence.

MAIN RESULTS

We screened 4635 unique citations to include 60 studies (30,530 participants). Thirty-five studies were conducted in Europe, 21 in North America, and four in Australia. Study populations were mostly chronic (37%), from healthcare (62%) or occupational settings (26%). General expectation was the most common type of recovery expectation measured (70%); 16 studies measured more than one type of expectation. Usable data for syntheses were available for 52 studies (87% of studies; 28,885 participants). We found moderate-quality evidence that positive recovery expectations are strongly associated with better work participation (narrative synthesis: 21 studies; meta-analysis: 12 studies, 4777 participants: odds ratio (OR) 2.43, 95% confidence interval (CI) 1.64 to 3.62), and low-quality evidence for clinically important recovery outcomes (narrative synthesis: 12 studies; meta-analysis: 5 studies, 1820 participants: OR 1.89, 95% CI 1.49 to 2.41), both at follow-up times closest to 12 months, using adjusted data. The association of recovery expectations with other outcomes of interest, including functional limitations (narrative synthesis: 10 studies; meta-analysis: 3 studies, 1435 participants: OR 1.40, 95% CI 0.85 to 2.31) and pain intensity (narrative synthesis: 9 studies; meta-analysis: 3 studies, 1555 participants: OR 1.15, 95% CI 1.08 to 1.23) outcomes at follow-up times closest to 12 months using adjusted data, is less certain, achieving very low- and low-quality evidence, respectively. No studies reported statistically significant or clinically important negative associations between recovery expectations and any low back pain outcome.

AUTHORS' CONCLUSIONS

We found that individual recovery expectations are probably strongly associated with future work participation (moderate-quality evidence) and may be associated with clinically important recovery outcomes (low-quality evidence). The association of recovery expectations with other outcomes of interest is less certain. Our findings suggest that recovery expectations should be considered in future studies, to improve prognosis and management of low back pain.

Effectiveness of Workplace Interventions in Return-to-Work for Musculoskeletal, Pain-Related and Mental Health Conditions: An Update of the Evidence and Messages for Practitioners

Purpose The objective of this systematic review was to synthesize evidence on the effectiveness of workplace-based return-to-work (RTW) interventions and work disability management (DM) interventions that assist workers with musculoskeletal (MSK) and pain-related conditions and mental health (MH) conditions with RTW. Methods We followed a systematic review process developed by the Institute for Work & Health and an adapted best evidence synthesis that ranked evidence as strong, moderate, limited, or insufficient. Results Seven electronic databases were searched from January 1990 until April 2015, yielding 8898 non-duplicate references. Evidence from 36 medium and high quality studies were synthesized on 12 different intervention categories across three broad domains: health-focused, service coordination, and work modification interventions. There was strong evidence that duration away from work from both MSK or pain-related conditions and MH conditions were significantly reduced by multi-domain interventions encompassing at least two of the three domains. There was moderate evidence that these multi-domain interventions had a positive impact on cost outcomes. There was strong evidence that cognitive behavioural therapy interventions that do not also include workplace modifications or service coordination components are not effective in helping workers with MH conditions in RTW. Evidence for the effectiveness of other single-domain interventions was mixed, with some studies reporting positive effects and others reporting no effects on lost time and work functioning. Conclusions While there is substantial research literature focused on RTW, there are only a small number of quality workplace-based RTW intervention studies that involve workers with MSK or pain-related conditions and MH conditions. We recommend implementing multi-domain interventions (i.e. with healthcare provision, service coordination, and work accommodation components) to help reduce lost time for MSK or pain-related conditions and MH conditions. Practitioners should also consider implementing these programs to help improve work functioning and reduce costs associated with work disability.

Chapter 6. Sickness absence due to back and neck disorders

The scientific evidence on the causes for sick leave attributed to back and neck disorders was reviewed. Categories were established for acute, recurring, and chronic problems based on the duration of the sick leave period. Forty-eight articles were found to be relevant, whereof two were of high quality and 26 were of medium or low quality. Quality was assessed exclusively in relation to the aim of this systematic review. The results reveal limited published research on causes for sick leave from back and neck disorders. The generalisability of the findings is also limited since most of the subjects were men and employees in manufacturing industries. Women, white-collar workers, employees in the public sector (care, social services, schools, etc) were underrepresented in the studies. Hence, these groups and areas should be studied further to verify conclusions and enhance knowledge about the causes for sick leave from back and neck disorders. The following factors were found to have consistent, but limited, support as regards their influence on the risk for sick leave due to back and neck disorders: (a) heavy physical workload, bent or twisted working position, and low work satisfaction increases the risk for short-term and long-term sick leave; (b) specific back diagnoses and previous sick leave due to back disorders increases the risk for short-term and long-term sick leave; (c) female gender, smoking, exposure to vibration, and deficient social support were not found to significantly increase the risk for short-term and long-term sick leave; (d) self-reported pain and functional impairments were associated with a high risk for long-term sick leave; (e) longer employment periods reduced the risk for short-term sick leave; (f) perceived demands at work did not influence short-term sick leave; (g) female gender and higher age increases the risk for disability pension.

Effectiveness of Installing Overhead Ceiling Lifts

The effectiveness of replacing floor lifts with mechanical ceiling lifts was evaluated in the extended care unit of a British Columbia hospital. Sixty-five ceiling lifts were installed between April and August 1998. Injury data were abstracted from injury reports for all staff musculoskeletal injuries (MSI) occurring in the unit during a 3 year period prior to installation and a 1.5 year follow up period. Descriptive statistics were calculated for injuries pre- versus post-installation. Rates were calculated as number of injuries per 100,000 worked hours. Rates for three pre- and three post-installation intervals were compared using Poisson regression. The rate of MSI caused by lifting/transferring patients was significantly reduced (58% reduction, p = .011) after installation, but rates of all MSI and MSI caused by repositioning did not statistically decline ( p > .05). Further follow up is necessary to determine whether or not ceiling lifts also can be effective for decreasing injuries related to repositioning patients on this unit.

Costs of Occupational Injury and Illness within the Health Services Sector

Knowledge of costs is essential to allocate medical resources efficiently. The authors' goal was to estimate and compare costs across occupations, industries, gender, race, and types of nonfatal injuries and illnesses. This is an incidence study of nationwide data, 1993. Nonfatal incidence data were drawn from the Bureau of Labor Statistics Annual Survey. Medical costs were from the Detailed Claims Information data set. Productivity (wage) costs were calculated using the Current Population Survey. Pain and suffering costs were estimated from data on jury verdicts. Injuries and illnesses to nursing aides and orderlies cost $2,200 million; costs were $900 million for registered nurses and $40 million for licensed practical nurses. The ranking of health services industries in terms of costs was: hospitals (52 percent of all costs), nursing care facilities (38 percent), home care services (6 percent), physicians' offices (4 percent), and laboratories (<1 percent). Types of injuries (sprains, strains, fractures) were similar across occupations and industries, but types of illness (carpal tunnel syndrome, respiratory diseases) varied. The most costly injured body parts were: back, shoulder, knee, wrist, and neck. Injuries and illnesses comprised roughly 90 percent and 10 percent, respectively, of total costs. The hospital industry was the third most expensive of 313 U.S. industries. Costs of occupational injury and illness in the health services industry were high and varied across occupation, industry, disease, race, and gender.

Predictors of delayed return to work after back injury: A case-control analysis of union carpenters in Washington State

METHODS

Union administrative records identified 20,642 union carpenters who worked in Washington State from 1989 to 2003. The Department of Labor and Industries provided records of workers' compensation claims and associated medical care. Work-related back claims (n = 4,241) were identified by ANSI codes (back, trunk, or neck/back) or ICD-9 codes relevant to medical care consistent with a back injury. Cases (n = 738) were defined as back injury claims with >90 days of paid lost time; controls (n = 699) resulted in return to work within 30 days. Logistic regression models estimated odds ratios and 95% confidence intervals (OR, 95% CI) of delayed return to work (DRTW).

RESULTS

Thirty percent of case claims and 8% of control claims were identified by an ICD-9 code. DRTW after back injury was associated with being female (2.7, 95% CI: 1.3-5.5), age 30-44 (1.2, 95% CI: 0.9-1.7) and age over 45 (1.6, 95% CI: 1.1-2.3), four or more years union experience (1.4, 95% CI: 1.1-1.8), previous paid time loss back claim (1.8, 95% CI: 1.3-2.5), and >or=30-day delay to medical care (3.6, 95% CI: 2.1, 6.1). Evidence of more acute trauma was also associated with DRTW.

CONCLUSIONS

Use of ICD-9 codes identified claims with multiple injuries that would otherwise not be captured by ANSI codes alone. Though carpenters of younger age and inexperience were at increased risk for a paid lost time back injury claim, older carpenters and more experienced workers, once injured, were more likely to have DRTW as were those who experienced acute events.

Understanding the role of sex differences in work injuries: Implications for primary care practice

PURPOSE

Primary care physicians care for work-injured women and men, yet there is little information on sex differences in outcomes and factors contributing to post-injury outcomes to guide their evaluation and recommendations.

METHODS

Two self-administered questionnaires were sent to a large sample of women and men with work injuries reported to the New Hampshire (USA) Department of Labour between November 2000 and March 2002. Factors associated with the work injury and outcomes were assessed.

RESULTS

A total of 3001 persons (1448 women and 1553 men) completed the first questionnaire and 67% completed the second questionnaire. Work-injured women were significantly younger, more educated, more likely to be single, had more pre-injury comorbidities, and worked in less physically demanding occupations as compared to work-injured men. Women's injuries were more often a result of routine job tasks and of gradual onset. Women had worse long-term outcomes including job stability and post-injury income. In multivariate analyses, being female was independently associated with a negative employer response and greater future work concerns.

CONCLUSIONS

Women and men differ in terms of work injury circumstances and factors contributing to post-injury outcomes. Primary care providers should consider sex when evaluating and treating work-injured adults.

Effect of a nurse back injury prevention intervention on the rate of injury compensation claims

PROBLEM

This study evaluated the effect of introducing a No Lifting policy on back injuries to nurses, across an entire health care system.

METHODS

Methods included: analysis of the data for all public health agencies in the Australian state of Victoria; compensation data from the Victorian Workcover Authority; data about workforce and program implementation from a retrospective survey of agencies; longitudinal analysis of standardized workers compensation claim rates for back injuries before, during and after the intervention.

RESULTS

A statistically significant decline in back injury claim rates during implementation contrasted with no statistically significant trends within the periods before and after the intervention. A statistically significant reduction occurred in mean quarterly standard back injury claim incidence rates per 1,000 equivalent fulltime nursing staff (EFTNS), representing a 24% reduction in standard back injury claims/1000 EFTNS.

DISCUSSION

Ergonomics principles encourage changing the work environment to suit the worker. This approach delivered a significant improvement in the immediate term.

IMPACT OF INDUSTRY

The substantial decline in back injury rates signifies a major improvement in the safety of a critical aspect of the work environment for nurses.

Return to work after injury: a review of evidence regarding expectations and injury perceptions, and their influence on outcome

INTRODUCTION

Work disability after injury is a complex problem, and there remains a lack of clarity about what factors are most influential on whether or not someone will experience difficulty returning to work. Increasingly, expectations and injury perceptions are being explored as potential factors in work disability, because of their role in influencing behaviours.

METHODS

This paper reviewed the literature regarding how expectations (regarding injury recovery and return to work) and injury perceptions relate to return to work outcome. A wide range of electronic journal databases were searched, and identified articles were critically appraised to assess quality and relevance. Results were then synthesised and discussed in relation to the evidence available regarding the role of expectations and injury perceptions in return to work, and implications for practice and further research.

RESULTS

Findings showed that evidence regarding to how both expectations and injury perceptions contribute to return to work outcome is limited. Some suggestions for application to practice are made. Methodological issues and key points to consider for future research are discussed.

CONCLUSIONS

While in general little is known about how much expectations and injury perceptions influence return to work outcome, it is clear that the issue requires further investigation. Key limits to current knowledge result from inadequate methods of measuring expectation/s, lack of clear definitions of 'return to work outcome' and differences in timeframes and populations. Never-the-less, there is promising evidence to suggest that, in particular, pain catastrophizing research is warranted due to its correlation with outcome and amenability to change.

Little effect of transfer technique instruction and physical fitness training in reducing low back pain among nurses: a cluster randomised intervention study

The aim of this study was to evaluate the effect of a transfer technique education programme (TT) alone or in combination with physical fitness training (TTPT) compared with a control group, who followed their usual routine. Eleven clinical hospital wards were cluster randomised to either intervention (six wards) or to control (five wards). The intervention cluster was individually randomised to TT (55 nurses) and TTPT (50 nurses), control (76 nurses). The transfer technique programme was a 4-d course of train-the-trainers to teach transfer technique to their colleagues. The physical training consisted of supervised physical fitness training 1 h twice per week for 8 weeks. Implementing transfer technique alone or in combination with physical fitness training among a hospital nursing staff did not, when compared to a control group, show any statistical differences according to self-reported low back pain (LBP), pain level, disability and sick leave at a 12-month follow-up. However, the individual randomised intervention subgroup (transfer technique/physical training) significantly improved the LBP-disability (p = 0.001). Although weakened by a high withdrawal rate, teaching transfer technique to nurses in a hospital setting needs to be thoroughly considered. Other priorities such as physical training may be taken into consideration. The current study supports the findings of other studies that introducing transfer technique alone has no effect in targeting LBP. However, physical training seems to have an influence in minimising the LBP consequences and may be important in the discussion of how to prevent LBP or the recurrence of LBP among nursing personnel.

Can a transitional work grant program in a workers' compensation system reduce cost and facilitate return to work?

Although previous research has shown returning the injured worker to work as soon as possible is important to the long-term prospects of the worker remaining in the work force, there is limited economic support for implementing such programs. Thus, the purpose of this case control study was to determine the cost savings of the implementation of a Transitional Work Grant (TWG) program, which consisted of several components including job analyses, education, communication and transitional work (TW). Companies that enrolled in the TWG program were matched to nonparticipating companies (NTW) based on employer size, type of industry, number of overall claims, and number of claims with > 7 days lost time (LT claims) submitted the year prior to enrollment. The study analyzed economic data: number of claims, number of LT claims, indemnity costs, medical costs, and days lost (days away from the workplace). An additional outcome was the ratio of LT claims (> 7 days lost work) to medical only (MO) claims (LT/MO ratio). Overall, participation in the TWG program was associated with decreased indemnity cost and decreased LT/MO ratio. However, effectiveness of the program varied by employer size and industry. In terms of the state of Ohio, these costs translate into substantial savings: more than $2.3 million per year. Although the cost savings and reduction in lost time claims is encouraging, the true benefit of TW has yet to be completely quantified. Future work must account for other potential co-factors and programs that could also contribute to the savings as well as document further the indirect benefits associated with a TWG program, such as improved employee morale and increased productivity and product quality that could be four times greater than the direct savings. In summary, programs such as this one adopted by several companies in Ohio can reduce the cost burden of injuries.

Surveillance of musculoskeletal injuries and disorders in a diverse cohort of workers at a tertiary care medical center

BACKGROUND

The purpose of this study was to investigate the incidence of work-related musculoskeletal (MSK) injuries and disorders among a dynamic cohort of health care workers, including direct care providers and support services, employed at a tertiary care medical center.

METHODS

Human resources data were used to define the cohort and time at risk. Workers' compensation (WC) records (1997-2003) were utilized to identify work-related MSK claims. Poisson regression was used to generate gender specific rate ratios and 95% confidence intervals (CI) of MSK injuries among workgroups.

RESULTS

MSK injuries resulted equally ( approximately 30% each) from lift/push/pull of equipment, patient handling, and slip/trip/falls. Injury rates and their mechanisms varied substantially by occupational group, gender, and race. Even with declining injury rates over time, black workers had rates 2.5 times higher than other workers and women had rates 1.8 times higher than men. Male and female nurses' aides, housekeepers, and radiology technicians had among the highest rates of injury, while lost workdays rates were highest for male and female nurses' aides, female housekeepers, and male patient transporters.

CONCLUSIONS

Differential risk associated with work tasks in highly segregated work populations can contribute to disparities in health, and the patterns we observed partly reflect the high concentration of female and black workers in occupations with increased physical demands. While the greatest public health impact will be achieved by implementing prevention strategies among large workgroups with high injury rates, public health efforts must not ignore smaller, often segregated, workgroups identified in this study as high risk.

On the job illness and injury resulting in lost work time among a national cohort of emergency medical services professionals

BACKGROUND

The objective of this study was to estimate the prevalence and incidence of job-related illness or injury resulting in lost work time among a national cohort of Emergency Medical Services (EMS) professionals. Also, it was hypothesized that individual and work life characteristics were associated with the occurrence of illnesses or injury.

METHODS

Data for this analysis were obtained from the Longitudinal Emergency Medical Technician Attributes and Demographics Study (LEADS), a prospective study of EMS professionals. The outcome variable of interest was self-reported absence from their EMS job due to an EMS work related illness or injury. The prevalence and incidence of injury with lost work time was estimated using cross-sectional and follow-up data. Multivariable logistic regression analyses were performed to determine if individual and work life characteristics were associated with occupational injury.

RESULTS

The prevalence of job-related illness or injury with time away from work was estimated at 9.4%, while the 1-year incidence was estimated at 8.1 per 100 EMS providers. The results from the logistic regression model fit to follow-up data indicate that increasing call volume (OR=3.12 for very high vs. moderate, 95% CI 1.40-6.97), an urban work environment (OR=2.79, 95% CI 1.65-4.72) and a history of back problems (OR=1.72, 95% CI 1.06-2.78) were associated with reporting job-related illness or injury.

CONCLUSIONS

Results from this analysis provide estimates of the prevalence and incidence of on the job illness and injury resulting in lost work time among a national cohort of EMS professionals.

Does safety climate moderate the influence of staffing adequacy and work conditions on nurse injuries?

PROBLEM

Hospital nurses have one of the highest work-related injury rates in the United States. Yet, approaches to improving employee safety have generally focused on attempts to modify individual behavior through enforced compliance with safety rules and mandatory participation in safety training. We examined a theoretical model that investigated the impact on nurse injuries (back injuries and needlesticks) of critical structural variables (staffing adequacy, work engagement, and work conditions) and further tested whether safety climate moderated these effects.

METHOD

A longitudinal, non-experimental, organizational study, conducted in 281 medical-surgical units in 143 general acute care hospitals in the United States.

RESULTS

Work engagement and work conditions were positively related to safety climate, but not directly to nurse back injuries or needlesticks. Safety climate moderated the relationship between work engagement and needlesticks, while safety climate moderated the effect of work conditions on both needlesticks and back injuries, although in unexpected ways. DISCUSSION AND IMPACT ON INDUSTRY: Our findings suggest that positive work engagement and work conditions contribute to enhanced safety climate and can reduce nurse injuries.

Can we predict poor recovery from recent-onset nonspecific low back pain? A systematic review

This systematic review of prospective cohort studies investigated the evidence for prognostic factors for poor recovery in recent-onset nonspecific low back pain (NSLBP). Medline, Cinahl, Embase, PsychINFO, and AMED databases were searched and citation tracking was performed. Fifty studies met the inclusion criteria. Bivariate and multivariable prognostic factor/outcome associations were extracted. Two reviewers independently performed data extraction and method quality assessment. Where data were available, odds ratios for bivariate associations were calculated and meta-analysis was performed on comparable prognostic factor/outcome associations. Despite the number of studies that have investigated these prognostic factors, uncertainty remains regarding which factors are associated with particular outcomes, the strength of those associations and the extent of confounding between prognostic factors. This uncertainty is the result of the disparate methods that have been used in these investigations, incomplete and contradictory findings, and an inverse relationship between study quality and the reported strength of these associations. The clinical implication is that the formation of clinically useful predictive models remains dependent on further high-quality research. The research implications are that subsequent studies can use the findings of this review to inform prognostic factor selection, and that prognostic studies would ideally be designed to enhance the capacity for findings to be pooled with those of other studies.

Psychosocial Factors in Musculoskeletal Disorders

Work-related musculoskeletal disorders (MSD) have a multifactorial etiology that includes not only physical stressors but also psychosocial risk factors, such as job strain, social support at work, and job dissatisfaction. Once an injury has occurred, psychosocial factors, such as depression and maladaptive pain responses, are pivotal in the transition from acute to chronic pain and the development of disability. Interventions to prevent MSD incidence and address psychosocial risk factors for delayed recovery are described.

Interventions to prevent back pain and back injury in nurses: a systematic review

A systematic literature review was undertaken to assess the effectiveness of interventions that aim to prevent back pain and back injury in nurses. Ten relevant databases were searched; these were examined and reference lists checked. Two reviewers applied selection criteria, assessed methodological quality and extracted data from trials. A qualitative synthesis of evidence was undertaken and sensitivity analyses performed. Eight randomised controlled trials and eight non-randomised controlled trials met eligibility criteria. Overall, study quality was poor, with only one trial classified as high quality. There was no strong evidence regarding the efficacy of any interventions aiming to prevent back pain and injury in nurses. The review identified moderate level evidence from multiple trials that manual handling training in isolation is not effective and multidimensional interventions are effective in preventing back pain and injury in nurses. Single trials provided moderate evidence that stress management programs do not prevent back pain and limited evidence that lumbar supports are effective in preventing back injury in nurses. There is conflicting evidence regarding the efficacy of exercise interventions and the provision of manual handling equipment and training. This review highlights the need for high quality randomised controlled studies to examine the effectiveness of interventions to prevent back pain and injury in nursing populations. Implications for future research are discussed.

Work status as a predictor of surgical outcome of discogenic low back pain

STUDY DESIGN

Prospective observational study.

OBJECTIVES

To evaluate the role of work status as a predictor of outcome from anterior lumbar fusion.

SUMMARY OF BACKGROUND DATA

Many psychosocial factors have been identified as predictors of chronic disability and of outcomes of surgery. Workers' Compensation and job satisfaction are two of the strongest and most evaluated factors. Work status at the time of intervention may also be relevant but has rarely been studied independently in patients having lumbar fusion.

METHODS

A total of 106 patients with discogenic low back pain were treated by anterior lumbar interbody fusion. Patients were prospectively monitored by VAS, Roland Morris score, and work status. The influence of preoperative work status on outcome variables was assessed using odds ratios. A multivariate analysis was performed to assess influence of other confounding variables. Follow-up was a mean 29.7 months with 95% greater than 1 year.

RESULTS

Patients working at the time of surgery had a 10.5 times greater likelihood of working at follow-up. Overall, only 43% of nonworkers were working at follow-up compared with 90% of patients who were working before surgery. This association was independent of Workers' Compensation, number of levels treated, and other demographic variables. A greater degree of pain relief was seen in patients working before surgery but not in function as measured by the Roland Morris score.

CONCLUSION

These results show that patients with chronic low back pain should be encouraged to continue working up until surgery.

Low back pain investigations and prognosis: a review

Low back pain is reviewed in terms of when investigations are useful and its clinical course. Despite the extensive evaluation of the accuracy of investigations such as radiography, magnetic resonance imaging, and myelography, there is a surprising dearth of research to inform their use in primary care. There is no clear evidence on which to base judgments for selection of appropriate tests to confirm or exclude low back pain pathology. It appears that investigations are rarely necessary for low back pain. Specific investigations should be ordered to identify a particular pathology but should not be ordered routinely for general screening. In the absence of pathology, low back pain and its associated disability improve rapidly in the first weeks after onset, but, in contradiction to all guidelines, both commonly persist and the best evidence suggests that recurrences are common.

Back pain in direct patient care providers: early intervention with cognitive behavioral therapy

Back pain and injury are a widespread problem for direct care providers and can lead to disability and job loss. Although most intervention studies focus on the number of reported injuries as the outcome variable, pain is a leading indicator of impending injury. More secondary prevention interventions focusing on early detection and treatment of pain are needed to reduce injuries. The primary aim of this study was to assess the feasibility and effect size of a cognitive behavioral therapy (CBT) intervention to reduce the measures of back pain, stress, and disability in direct care providers working with back pain. The secondary aim was to assess the association between affect and outcome variables, particularly unscheduled work absence, which is a component of disability. This randomized clinical trial recruited 32 registered nurses and nursing assistants with a history of back pain in the past year and assigned them to either an intervention or a control group. The CBT intervention was a weekly stress and pain management session over 6 weeks led by a clinical psychologist. Data for both groups were collected at baseline and at 6 weeks, with work absence data caused by back pain self-reported for 12 weeks. Pain intensity scores declined in the intervention group, indicating a large effect. However, stress scores increased. Depression scores accounted for one-third of the variance in hours absent because of back pain. Although there was a high dropout rate in the intervention group, a cognitive-behavioral intervention shows promise as a secondary prevention intervention.

Self-rated health as a predictor of return to work among employees on long-term sickness absence

AIMS

The aim of the present study is to identify self-rated health predictors of return to work (RTW) within the study population as a whole as well as in three subgroups, namely musculoskeletal complaints, other physical health complaints, and psychological complaints.

METHODS

The study was based on a sample of 862 employees on sickness absence (maximum duration of 12 weeks). The employees filled out a baseline questionnaire and were subsequently followed until the tenth month after listing sick. Cox proportional hazards regression analyses were used to identify determinants of RTW.

RESULTS

For the study population as a whole type of complaint, earlier sickness absence, subjective severity of complaints and several RAND-36 subscales were predictive of RTW. Furthermore, the RAND-36 subscales physical functioning, physical role limitations, mental health, and health change were predictive of RTW among employees with musculoskeletal complaints. For employees with other physical health problems subjective severity of complaints and the RAND-36 subscales physical and social functioning, general health perception, and health change were associated with RTW. Finally, with regard to the group with psychological complaints the RAND-36 subscales mental health and general health perception predicted RTW.

CONCLUSION

Several aspects of self-rated health predict RTW for employees on long-term sickness absence. Variables related to functional status predict RTW for employees with physical complaints in contrast to psychological problems.

A study of factors influencing return to work after wrist or ankle fractures

BACKGROUND

Factors associated with time to return to work are poorly understood for occupational injuries, other than those to the back.

METHODS

Anonymized data on claims for work-related wrist or ankle fracture between 1/1/1998 and 12/31/2002 were identified in administrative data held by the Workers Compensation Board in Alberta, Canada. Bivariate and Cox regression analyses were used to identify factors associated with return to work.

RESULTS

Increased duration of temporary disability (TD) was associated with older age, female gender, work in construction and construction trade services, smaller company size, higher industry claim rates, a fall/jump from a height, ankle fracture, and greater medical aid costs in the 30 days following injury (used as a proxy for severity).

CONCLUSIONS

Factors associated with longer time off work were largely consistent with those reported following back injury. Median time to return to work was longer following ankle than wrist fracture. Although Workers' Compensation Board (WCB) administrative data provided information that could be used to identify factors affecting return to work, better information on injury severity would considerably enhance their research potential.

Prognostic factors for duration of sick leave due to low-back pain in dutch health care professionals

BACKGROUND

Information on prognostic factors for duration of sick leave due to low-back pain (LBP) is growing. In this prospective cohort study prognostic factors for duration of sick leave and course of disability were identified in a very early stage of sick leave due to LBP in an occupational health care setting.

METHODS

A total of 615 workers calling in sick from work due to LBP at an occupational health service (OHS) of one institution completed a questionnaire. Duration of follow-up was 26 weeks. Prognostic factors were identified by means of Cox regression analysis and multiple linear regression analysis, and explained variance was calculated.

RESULTS

Median time to first return to work (RTW) was 5 days (Inter Quartile Range (IQR) = 2-12). Median time to lasting return to work (LRTW) was 6 days (IQR = 3-13). The final model for delayed RTW included self-reported expected duration of sick-leave, treatment by GP or specialist, care-seeking, diminished mobility, and the interaction between care-seeking and diminished mobility. The final model for LRTW included: self-reported expected duration of sick-leave, treatment by GP or specialist, care-seeking, the interaction between the self-reported expected duration of sick-leave and seeking care at OHS, complaints due to job stress, diminished mobility, and the interactions between expected duration of more then 10 days and seeking OP care and diminished mobility. Median total days on sick leave (TDSL) was 6 days (IQR = 3-13 days). The final model for TDSL included: age, expected duration of sick leave, treatment by GP or medical specialist, seeking OP care, complaints due to physical load, and diminished mobility. Explained variance (R2) of these models ranged from 30 to 35%.

CONCLUSIONS

Poor prognosis for duration of sick leave can be identified by means of a simple questionnaire administered on the first day of sick leave. Workers at high risk for longer duration of sick leave (all outcomes) expected to stay off work longer, were already being treated by a MD, sought OP care, and had diminished mobility. In case of delayed LRTW workers reported job stress as a possible cause of sick leave. Interactions were found in both RTW and LRTW between care-seeking and diminished mobility and in LRTW between expected duration of sick leave and seeking OP care. Older age increased TDSL with borderline significance.

Workplace-based return-to-work interventions: a systematic review of the quantitative literature

INTRODUCTION

A systematic review was conducted to review the effectiveness of workplace-based return-to-work (RTW) interventions.

METHOD

Seven databases were searched, in English and French, between January 1990 and December 2003 for peer-reviewed studies of RTW interventions provided at the workplace to workers with work disability associated with musculoskeletal or other pain-related conditions. Methodological quality appraisal and data extraction were conducted by pairs of reviewers.

RESULTS

Of a total of 4124 papers identified by the search, 10 studies were of sufficient quality to be included in the review. There was strong evidence that work disability duration is significantly reduced by work accommodation offers and contact between healthcare provider and workplace; and moderate evidence that it is reduced by interventions which include early contact with worker by workplace, ergonomic work site visits, and presence of a RTW coordinator. For these five intervention components, there was moderate evidence that they reduce costs associated with work disability duration. Evidence for sustainability of these effects was insufficient or limited. Evidence regarding the impact of supernumerary replacements was insufficient. Evidence levels regarding the impact of the intervention components on quality-of-life was insufficient or mixed.

CONCLUSIONS

Our systematic review provides the evidence base supporting that workplace-based RTW interventions can reduce work disability duration and associated costs, however the evidence regarding their impact on quality-of-life outcomes was much weaker.

Early disability risk factors for low back pain assessed at outpatient occupational health clinics

STUDY DESIGN

Inception cohort (<or=14 days after pain onset) with 1-month follow-up.

OBJECTIVE

To determine whether disability risk factors provided by patients and clinicians at a first medical visit for acute occupational low back pain predict outcomes.

SUMMARY OF BACKGROUND DATA

Improving health and work outcomes for patients with occupational low back pain may require early identification of risk factors for persistent pain and disability. Previous studies of back pain prognosis have not assessed patients at the time of initial provider contact, and many have not differentiated between occupational and nonoccupational injuries.

METHOD

Patients (183 female, 385 male) presenting to occupational health clinics with recent onset occupational low back pain (<or=14 days duration) completed a 16-item survey of potential disability risks including demographic, injury, workplace, psychosocial, and symptom factors. After the initial visit, clinicians completed an additional 10-item questionnaire of symptoms and initial prognosis. Outcome variables of functional limitation and work status were assessed 1 month after pain onset.

RESULTS

In multivariate analyses, functional improvement and return to work were more strongly predicted by employer factors (job tenure, physical work demands, availability of modified duty, earlier reporting to employer) and self-ratings of pain and mood than by health history or physical examination. A logistic regression model had a sensitivity of 74.3% to predict those remaining out of work and a specificity of 70.1%.

CONCLUSIONS

Early screening for disability risk factors may be helpful to identify those patients at greatest risk for delayed recovery from occupational low back pain. Intervention strategies for high-risk patients might be improved by focusing on job factors, pain coping strategies, and expectations for recovery.

Psychosocial factors predictive of occupational low back disability: towards development of a return-to-work model

This paper focuses on the identification and testing of potential psychosocial factors contributing to an integrated multivariate predictive model of occupational low back disability. Psychosocial predictors originate from five traditions of psychosocial research: psychopathological, cognitive, diathesis-stress, human adaptation and organizational psychology. The psychosocial variables chosen for this study reflect a full range of research findings. They were investigated using 253 subacute and chronic pain injured workers. Three outcome measures were utilized: return-to-work status, duration of disability and disability costs. The key psychosocial predictors identified were expectations of recovery and perception of health change. Also implicated, but to a lesser degree, were occupational stability, skill discretion at work, co-worker support, and the response of the workers' compensation system and employer to the disability. All psychosocial models were better at predicting who will return than who will not return to work.

Acute low back pain: systematic review of its prognosis

OBJECTIVES

To describe the course of acute low back pain and sciatica and to identify clinically important prognostic factors for these conditions.

DESIGN

Systematic review.

DATA SOURCES

Searches of Medline, Embase, Cinahl, and Science Citation Index and iterative searches of bibliographies.

MAIN OUTCOME MEASURES

Pain, disability, and return to work.

RESULTS

15 studies of variable methodological quality were included. Rapid improvements in pain (mean reduction 58% of initial scores), disability (58%), and return to work (82% of those initially off work) occurred in one month. Further improvement was apparent until about three months. Thereafter levels for pain, disability, and return to work remained almost constant. 73% of patients had at least one recurrence within 12 months.

CONCLUSIONS

People with acute low back pain and associated disability usually improve rapidly within weeks. None the less, pain and disability are typically ongoing, and recurrences are common.

Are components of a comprehensive medical assessment predictive of work disability after an episode of occupational low back trouble?

STUDY DESIGN

One hundred fifty-nine subacute low back work-injured patients completed a full medical assessment at baseline. A full repeat examination was performed 3 months later, when return-to-work status was determined.

OBJECTIVE

To determine the prognostic value of a comprehensive medical assessment for the prediction of return-to-work status.

SUMMARY OF BACKGROUND DATA

A systematic review of the work disability prediction literature of low back trouble prognosis revealed that no high-quality studies included a full medical history and physical examination in the design. The results of studies included in the systematic review were equivocal with respect to predictive usefulness of medical variables.

METHODS

Participants completed medical history questionnaires and then were clinically examined by one of six experienced examiners (three physicians and three physiotherapists). Return-to-work status was measured 3 months later, and predictive validity was evaluated using logistic regression modeling.

RESULTS

Medical variables (, medical history subscales, physical examination subscales, and lumbar range-of-motion tests) showed modest correct classification rates varying between 61.6% and 69.1% for participants.

CONCLUSIONS

Comprehensive medical assessments play a crucial role in the early identification of serious pathology after low back trouble. We were unable to identify, however, any medical evaluation variables that would account for significant proportions of variance in return to work. The weight of evidence obtained in this study suggests that injured workers' subjective interpretations and appraisals may be more powerful predictors of the course of postinjury recovery than exclusively medical assessments.

Work-related outcomes in occupational low back pain: a multidimensional analysis

OBJECTIVES

This pilot study explored a broad range of work-related outcomes for occupational low back injuries.

METHODS

A model of occupational outcomes and a survey instrument were developed on the basis of interviews, expert opinion, and literature reviews. New Hampshire workers who had an occupational back injury a year before the study were sampled from first reports of injury and sent a mailed survey about their postinjury experiences and related factors.

RESULTS

Of 251 randomly selected cases, a valid address could be identified for 121, and 99 patients responded. Almost 60% of the respondents had lost 1 week of work or more. At 1 year after injury, half of the respondents had returned to their preinjury job and employer, and 20% were unemployed, half of them because of the injury. Most working respondents reported no decrease in their work capacity. However, 68% still had pain exacerbated by work, and 47% worried that their condition would worsen with continued work. Reinjury occurred in 42% of the respondents. The work-related outcome measures were largely independent of each other. Exploratory multivariate analyses demonstrated unique patterns of factors associated with each outcome. Reinjury risk was significantly greater in respondents whose employers offered accommodations or whose postinjury jobs had greater ergonomic risk. The small sample size limited the ability to achieve statistically significant results in multivariate analyses.

CONCLUSIONS

Simply measuring return to work did not appear to capture the full range of job-related consequences from occupational back injuries in this pilot evaluation. Timing of return to work, occupational ergonomic risks, and appropriate job modifications appeared to be particularly important in a safe return to the job after an occupational low back injury. Results suggest opportunities to address risk factors that may improve work outcomes.

Lesões ocupacionais afetando a coluna vertebral em trabalhadores de enfermagem

Através do levantamento das comunicações de acidente do trabalho (CAT) de um hospital universitário no período de janeiro de 1990 a dezembro de 1997, analisou-se determinadas características da ocorrência de acidentes do trabalho relacionados com a coluna vertebral em trabalhadores de enfermagem. Verificou-se que nesse período foram notificados 531 acidentes e 37 (7,0%) destes eram acidentes típicos que comprometeram a coluna vertebral. Os resultados indicam subnotificação do acidente e que a categoria mais acometida foi o atendente de enfermagem. Os acidentes ocorreram principalmente pela movimentação e transporte de equipamentos e pacientes e pelas quedas.

Working with low back pain: workplace and individual psychosocial determinants of limited duty and lost time

BACKGROUND

Few studies have identified the risk factors associated with lost time in employees working with occupational low back pain (OLBP) despite the presence of pain. Such data could assist in the development of evidenced-based secondary prevention programs.

METHODS

The present investigation was a case-control study (n = 421) of demographic, health behavior, ergonomic, workplace and individual psychosocial factors hypothesized to be associated with lost time in young, full-time employees (i.e., soldiers) with OLBP. Analyses of the burden of OLBP in terms of the number of days on limited duty and lost time status were also computed.

RESULTS

Logistic regression analysis indicated that female gender, education beyond HS/GED, longer time working in military, higher levels of daily life worries, no support from others, higher levels of ergonomic exposure, stressful work, increased peer cohesion, and greater perceived effort at work placed a worker at a greater likelihood for OLBP-related lost work time. Lower levels of innovation, involvement, and supervisor support were also associated with lost time. Linear regression indicated that the number of days of lost time and limited duty was associated with lower levels of physical health and higher levels of symptom severity.

CONCLUSIONS

The results support the potential utility of interventions targeting ergonomic, workplace and individual psychosocial risk factors in secondary prevention.

[Ergonomics in the transfer of patients: a study carried out with workers of a transportation center at a university hospital]

The purpose of this study was to evaluate ergonomic aspects involved in using a stretcher and a wheel chair to transfer patients. 249 transfers carried out by the workers of a university hospital lifting sector were observed. The observations showed that the idea of having a team to transfer patients has to be stimulated but the members of the team require specific training in handling and transferring patients. Mechanical equipment and other devices should also be available.

Centralization phenomenon as a prognostic factor for chronic low back pain and disability

STUDY DESIGN

Two hundred twenty-three consecutive adults with acute low back pain with or without referred spinal symptoms were treated conservatively and followed prospectively for 1 year.

OBJECTIVES

To investigate the predictive value of centralization phenomenon (CP) with psychosocial variables previously identified as important risk factors for patients with acute onset of nonserious or nonspecific low back pain who subsequently develop chronic pain or disability.

SUMMARY OF BACKGROUND DATA

Psychosocial factors have been shown to be predictors of chronic disability, but measures from physical examination rarely predict chronic behavior. The authors of the present study investigated whether dynamic assessment of changes in clinical measures during treatment could be used to classify patients and predict occurrence of chronic pain or disability.

METHODS

Patients with acute symptoms and no history of surgery were treated by five physical therapists trained in McKenzie evaluation/treatment methods. Seventy-three percent were receiving workers' compensation benefits. At initial evaluation and discharge, 23 independent variables were assessed representing psychosocial, clinical, and demographic factors. Pain location changes to repeated trunk movements were assessed at every visit. Patients were placed in two groups: 1) those with pain that did not centralize and 2) those who completely centralized or demonstrated partial reduction of pain location with time. Treatment was individualized and based on McKenzie methods. Patients were contacted at 12 months after discharge, and dependent variables of pain intensity, return to work status, sick leave at work, activity interference at home, and continued use of health care were assessed.

RESULTS

Nine independent variables influenced pain symptoms or disability. Pain pattern classification (noncentralization) and leg pain at intake were the strongest predictive variables of chronicity.

CONCLUSION

Dynamic assessment of change in anatomic pain location during treatment and leg pain at intake were predictors of developing chronic pain and disability.

Predictors of chronic disability in injured workers: a systematic literature synthesis

BACKGROUND

Loss of productive life among injured workers potentially could be prevented by clearer knowledge of disability risk factors. Despite the number of studies that have examined predictors of disability, there have been no systematic literature reviews integrating multiple risk factor domains. Such a synthesis could help to define important gaps in knowledge, inform future study designs most likely to successfully address these gaps, and highlight the importance of secondary (disability) prevention to public health policy. A systematic synthesis of the literature on risk factors for chronic or recurrent disability in injured workers was performed to meet this need.

METHODS

Articles were identified through a MEDLINE search, personal file searches, and requests to experts. Information concerning study methods and results was abstracted from 20 articles that met the inclusion criteria (population-based or prospective cohort studies).

RESULTS

The most frequently identified predictors of prolonged disability were older age and greater baseline pain and functional disability. Lumbar symptoms, smaller company size, and construction work were significant predictors in several, but not all, studies. Risk factors did not appear to differ for back versus mixed injuries.

CONCLUSIONS

Several risk factors for prolonged disability were identified. Research is needed to develop and test multivariate models of worker, workplace, health care, and administrative risk factors for prolonged and recurrent disability in order to refine and target interventions.

A facilitated early return to work program at a large urban medical center

An Early Return to Work Program was initiated at The Johns Hopkins Hospital and Associated Schools of Medicine, Hygiene and Nursing in Baltimore, Maryland, in April 1992 as part of a comprehensive effort to control the incidence and costs of work-related illnesses and injuries. The program was similar to others that incorporate employee and supervisory training and job accommodation, but it also included an industrial hygienist trained in ergonomics to facilitate the placement of individuals with restrictions. The return to work program was studied over a 10-year period, comparing the number of lost workday cases, lost workdays, and restricted duty days before (1989 to 1992) and after (1993 to 1999) initiation of the program. A significant decrease (55%) was observed in the rate of lost workday cases before versus after the return to work program. Furthermore, the number of lost workdays decreased from an average of 26.3 per 100 employees before, to 12.0 per 100 employees after, the return to work initiative, and the number of restricted duty days went from an average of 0.63 per 100 employees to 13.4 per 100 employees (a twentyfold increase). The study suggests that a well-structured early return to work program is an integral part of a comprehensive effort to control the duration of disability associated with occupational injuries and illness. It also indicates that to be most effective, an early return to work program must include participation by medical providers, safety professionals, injured employees, and supervisors. Our work suggests that even with these elements in place, the effectiveness of return to work programs may be increased by including an individual trained in ergonomics to facilitate the job placement process.

Predictors of time loss after back injury in nurses

STUDY DESIGN

A 2-year prospective inception cohort study of back injury in nurses.

OBJECTIVES

To determine the extent to which characteristics of nurses, of the injury, and of the workplace predict occurrence and duration of time loss from work after back injury.

SUMMARY OF BACKGROUND DATA

During 2 years, 320 nurses incurred 416 back injuries at a large teaching hospital in Winnipeg, Canada. Nurses injured on preselected wards were targeted for early intervention, including provision of modified work, whereas nurses injured on other wards received the usual care.

METHODS

Time loss attributable to the back injury during the 6 months after injury was analyzed. Three statistical models were used to examine occurrence of time loss (logistic regression), duration of time loss (Tobit regression), and duration of time loss once an injury incurring time loss had been documented (least-squares regression).

RESULTS

In 218 of the 416 injuries, the injured nurse consented to interview. Whereas perceived disability was related to whether a time loss injury would ensue, self-reported pain was strongly related to the duration of time loss once an injury had become a time loss injury. Duration of time loss was reduced by participation in the return-to-work program. Mechanism of injury, specifically injury occurring while lifting patients, resulted in greater time loss.

CONCLUSIONS

Focusing on reducing the perception of disability at the time of injury is critical to preventing time loss, but once time loss has occurred, offer of modified work and attention to pain reduction are warranted. The findings add to the evidence that workplace-based intervention programs can be effective in reducing the morbidity resulting from back injury.