Work-related beliefs about injury and physical capability for work in individuals with chronic pain

Combining Virtual Reality and Behavioral Health to Promote Pain Resiliency: Analysis of a Novel BioPsychoSocial Modality for Solving Pain in the Workplace

Background

The use of virtual reality in treating pain symptoms is a new and emerging modality that has gained more traction, especially in light of the COVID-19 pandemic, which has led to a rise in the remote care of patients. Our study tested the effectiveness of a home-based pain relief program that utilized virtual reality and behavioral health for treating acute and chronic pain.

Study Design

Retrospective Cohort Study.

Methods

Due to the remote nature of the pain clinic during the COVID-19 pandemic, patients with work-related injuries were considered for inclusion in a 90-day Harvard MedTech Vx Pain Relief Program, which consisted of home-based virtual reality therapy (VRT) and tailored behavioral therapy that was conducted through phone consultations. Both the VRT and behavioral therapy focused on the specific workplace injury and centered around setting three personal goals for each patient that were considered meaningful to them. The progress towards achieving these goals was then tracked. The primary outcome of the retrospective analysis was pain scores after completion of home-based VRT. Secondary outcomes included: change in opioid therapy (opioid consumption), psychological awareness/perception of pain, level of immersion, and overall improvement/achievement in patient goals.

Results

A total of 36 patients (16 male and 20 female) with acute and chronic pain secondary to workplace injuries were included; these injuries severely limited their activities of daily living and reduced their quality of life. During the course of VRT and after completion of the 90-day program, patients experienced a substantial immediate and legacy pain relief. Specifically, patients reported an average 40% reduction in pain while utilizing the program and an additional 2.8 h of continued pain relief at the conclusion of 90 days. Further, 69% of patients also reported either a decrease in opioid use or complete cessation after VRT. The majority of patients also reported reduced depression, fatigue, and sleep disturbance.

Conclusions

The Harvard MedTech Vx Therapy appears to be an effective tool in the treatment of pain and the psycho-social issues associated with pain. This translates into a greater degree of pain resiliency and an overall improvement in general wellness and improved workplace functionality.

Pain Anxiety as a Mechanism Linking Pain Severity and Opioid Misuse and Disability Among Individuals With Chronic Pain

OBJECTIVE

Chronic pain affects a significant number of individuals in the United States and is associated with several negative health-related outcomes, including possibility of opioid misuse and disability. The identification of factors associated with both opioid misuse and disability is of critical public health importance, and significant research suggests that pain severity has been shown to be associated with both. Pain-related anxiety has been uniquely associated with both opioid misuse and disability, yet little research has examined pain-related anxiety as a potential mechanism linking pain severity with opioid misuse and disability.

METHOD

Therefore, the current study examined whether pain-related anxiety explains, in part, the relationship between pain severity, opioid misuse, and disability among 396 adults with chronic pain (55.8% female, Mage 36.61, SD 11.40).

RESULTS

Cross-sectional analyses indicated that pain-related anxiety significantly mediated the relationship between pain severity, opioid misuse outcomes, and psychosocial disability, but not physical disability.

CONCLUSIONS

These results build upon the literature indicating the importance of pain-related anxiety in those with chronic pain by suggesting this construct may account, in part, for the relation of pain intensity to opioid misuse and psychosocial disability. Future research should longitudinally examine these associations.

Difficulties in emotion regulation and chronic pain-related disability and opioid misuse

Risk for opioid misuse is a crucial consideration for patients with chronic pain, given the recent high rates of opioid-related deaths in the U.S. Emotion regulation difficulties may be associated with chronic pain outcomes such as opioid misuse, but may also be amenable to intervention. The aim of this study was to examine associations between difficulties with emotion regulation and disability and risk for opioid misuse among Appalachian chronic pain patients. The Difficulties in Emotion Regulation scale (DERS-18), Pain Disability Index (PDI), Screener and Opioid Assessment for Patients with Pain - Revised (SOAPP-R), and Current Opioid Misuse Measure (COMM) were collected from 149 patients (age 25-80, 59% female) presenting to a behavioral medicine department for evaluation. The extent to which DERS-18 scores predict risk for opioid misuse and disability was examined via hierarchical regression, logistic regression, and receiver operating characteristic (ROC) curve analyses. DERS-18 scores account for 45% of variance in SOAPP-R, 36% in COMM scores, and 11% in PDI scores. A one-point increase in DERS-18 score is associated with 19% greater odds of being at risk for misuse as measured by the SOAPP-R, and 16% greater odds on the COMM. In ROC analyses, the DERS-18 is a good predictor of risk on the SOAPP-R (AUC = .85) and COMM (.83), with cut-off scores in the mid-30s exhibiting good sensitivity and specificity. Difficulties in emotion regulation are associated with poorer functioning and with greater risk of opioid misuse in this population, but may be amenable to intervention.

Does Age Affect the Relationship Between Pain and Disability? A Descriptive Study in Individuals Suffering From Chronic Low Back Pain

BACKGROUND

Previous studies have revealed a weak to moderate relationship between pain and disability in individuals suffering from low back pain (LBP). However, to our knowledge, no studies have evaluated if this relationship is different between young and older adults.

PURPOSE

The objective of this descriptive, cross-sectional study was to determine whether the relationship between LBP intensity and physical disability is different between young and older adults.

METHODS

Pain intensity (measured with a visual analog scale) and physical disability scores (measured with the Oswestry Disability Index) were collected from the medical files of 164 patients with LBP. Separate Pearson correlation coefficients were calculated between these 2 variables for young (mean age 40 ± 6 years, n = 82) and older (62 ± 9 years, n = 82) individuals and a Fisher r-to-z transformation was used to test for group differences in the strength of the relationship. Linear regression analyses were also performed to determine whether the slope of the association was different between the 2 groups.

RESULTS

A significant and positive association was found between pain intensity and disability for both young and older individuals. However, the correlation was stronger in the young group (r = 0.66; P < .01) than in the older group (r = 0.44; P < .01) (Fisher Z = 2.03; P < .05). The linear regression model also revealed that the slope of the relationship was steeper in the young group (P < .05).

CONCLUSION

Although both young and older individuals showed a significant association between pain intensity and disability, the relationship between these 2 variables was more tenuous in older individuals than in young patients. Future research is essential to identify the factors underlying this age-related difference.

The effect of changes in pain expectations on persistent pain following a road traffic crash

BACKGROUND

Recovery expectations can influence outcomes after injury, but little is known about the course of expectations over time or factors predicting changes in expectations. This study aimed to describe how expectations of persistent pain change over time following a non-catastrophic injury sustained in a road traffic crash (RTC); identify the early predictors of change in expectations over time; and examine whether change in expectations predicted pain at 24 months post-RTC.

METHODS

One hundred and seventy-seven participants (Mage = 49.25; SD = 14.15; 66.1% female) reported their expectations of persistent pain (1 = no risk that pain will become persistent, 10 = highest risk) at approximately 6, 12 and 24 months post-injury via survey. Measures of pain, emotional distress, post-traumatic stress, fear avoidance beliefs, social support and quality of life were also measured via survey at each time point.

RESULTS

Cluster analysis revealed four clusters: 42% of participants showed a pattern of stable expectations (stable high-risk, n = 74), whereas 58% of participants showed changes in expectations over time (decreasing risk, n = 31; increasing risk, n = 44; risk peaking at 12 months, n = 28). Hierarchical linear regression models demonstrated that the clusters were a better statistical predictor of pain at 24 months than a single measure of expectation taken at 6 months post-injury. Pain, anxiety, depression and physical health-related quality of life at 6 months were associated with cluster affiliation.

CONCLUSIONS

Assessment of patterns of pain expectancy change is a superior means of determining long-term pain levels. Understanding expectancy change patterns will help provide more nuanced targets for pain intervention.

SIGNIFICANCE

This study extends previous work by investigating persistent pain expectancies over time in a compensation-seeking cohort with non-catastrophic injuries. It identifies factors that are associated with changing expectations, providing targets for clinical intervention. The study shows that expectations can change over time. Conversations with patients about their expectations should be ongoing.

Behavioral Treatments for Post-Traumatic Headache

PURPOSE OF REVIEW

Post-traumatic headache (PTH) is a common headache type after traumatic brain injury (TBI). There are no FDA approved medications for PTH, and it is unknown how medications can affect the brain's ability to recover from TBI. Thus, we sought to examine the biopsychosocial factors that influence PTH and the non-pharmacologic treatments studied for headache treatment. We also sought to determine if there is literature examining whether the non-pharmacologic treatments influence the biopsychosocial factors. The non-pharmacologic treatments assessed included cognitive behavioral therapy (CBT), biofeedback, progressive muscle relaxation therapy (PMR), acupuncture, and physical therapy (PT).

RECENT FINDINGS

Factors associated with prognosis in PTH may include the following: severity of TBI, stress, post-traumatic stress disorder, other psychiatric comorbidities, sociocultural and psychosocial factors, litigation, base rate misattribution, expectation as etiology, and chronic pain. There are few high quality studies on the non-pharmacologic treatments for PTH. Thermal and EMG biofeedback appear to have been examined the most followed by CBT. Studies did not have secondary outcomes examining the psychosocial factors related to PTH. Most of the behavioral studies involved a multi-modality intervention limiting the ability to assess the individual non-pharmacologic interventions we sought to study. There were very few randomized clinical trials evaluating the efficacy of non-pharmacologic interventions. Therefore, future research, which considers the noted biopsychosocial factors, is needed in the field to determine if these interventions reduce PTH.

Fear-avoidance beliefs are independently associated with the prevalence of chronic pain in Japanese workers

PURPOSE

Pain is a global public health problem with implications for both personal and social heath. Fear-avoidance beliefs (FABs) have been demonstrated to negatively impact and prolong pain in many Western countries, but little is known about the association between FABs and chronic pain (CP) in Asian countries, including Japan. We examined the relationship between FABs and CP in Japanese white-collar workers, a growing population with a high prevalence of CP.

METHODS

Questionnaires and company records were used to gather data from 433 Japanese white-collar workers. Data were related to experience of pain, participant sociodemographic/health/lifestyle characteristics, fear-avoidance beliefs [Tampa Scale for Kinesiophobia (TSK)], work-related psychosocial factors (Brief Job Stress Questionnaire), and depressive illness [Psychological Distress Scale (K6)]. Analysis of covariance and multilevel logistic regression modeling were used to analyze associations between the data while controlling for factors known to influence CP prevalence.

RESULTS

Prevalence rate of CP was 11.1% (48 of 433 persons). Adjusted odds ratios for participants with CP significantly increased in participants with high TSK scores, even after adjusting for factors known to influence CP prevalence.

CONCLUSION

We found a significant association between high TSK scores and CP in Japanese white-collar workers when controlling for other known factors that influence CP such as work-related psychosocial characteristics and depressive conditions. This finding suggests that FABs are independently associated with prevalence of CP.

The Relationship between Pain Beliefs and Physical and Mental Health Outcome Measures in Chronic Low Back Pain: Direct and Indirect Effects

Low back pain remains a major health problem with huge societal cost. Biomedical models fail to explain the disability seen in response to reported back pain and therefore patients’ beliefs, cognitions and related behaviours have become a focus for both research and practice. This study used the Pain Beliefs Questionnaire and had two aims: To examine the extent to which pain beliefs are related to disability, anxiety and depression; and to assess whether those relationships are mediated by pain self-efficacy and locus of control. In a sample of 341 chronic low back pain patients, organic and psychological pain beliefs were related to disability, anxiety and depression. However, organic pain beliefs were more strongly related to disability and depression than psychological pain beliefs. Regression analyses revealed that these relationships were in part independent of pain self-efficacy and locus of control. Further, mediation analyses revealed indirect pathways involving self-efficacy and, to a lesser extent chance locus of control, between organic pain beliefs, on the one hand, and disability, anxiety and depression, on the other. In contrast, psychological pain beliefs were only directly related to disability, anxiety and depression. Although longitudinal data are needed to corroborate our findings, this study illustrates the importance of beliefs about the nature of pain and beliefs in one’s ability to cope with pain in determining both physical and mental health outcomes in chronic low back pain patients.

Working with Musculoskeletal Pain

Pain has a significant impact on work in terms of presenteeism, sickness absence, and long-term incapacity for workA bio-psychosocial approach is required in understanding pain-related disability and incapacity for workLong-term absence from work is associated with a number of negative outcomes including; poverty, social exclusion and poorer physical and psychosocial well-beingReturn to work can improve recovery for people with musculoskeletal complaints and painInterventions to reduce the impact of pain on work can operate at clinical, worker, workplace, and wider systems levelsA broader whole systems approach to pain management needs to be adopted, with a greater focus on work retention as well as rehabilitation.

Psychometric properties of the Japanese version of the Tampa Scale for Kinesiophobia (TSK-J) in patients with whiplash neck injury pain and/or low back pain

BACKGROUND

Although the Tampa Scale for Kinesiophobia (TSK) is useful for measuring fear of movement in patients with musculoskeletal pain, no psychometrically validated Japanese version is available. We evaluated the reliability and validity of the Japanese version of the TSK-J (original 17-item version and shorter 11-item version).

METHODS

The data subset used in this psychometric testing was derived from a survey previously conducted to collect information on musculoskeletal pain due to motor vehicle accident. For reliability, internal consistency was assessed via Cronbach's alpha coefficient. For concurrent validity, Pearson correlation coefficients of the TSK-J with the pain catastrophizing scale (PCS), euroqol 5 dimension (EQ-5D), and numerical rating scales (NRSs) for pain in the neck and back were calculated. For known-group validity, the relationship between variables (e.g., depression, somatic symptoms, treatment period) and the TSK-J score was examined.

RESULTS

Data from 956 persons who had suffered from a motor vehicle accident were used in this analysis. For reliability, internal consistency was demonstrated, with Cronbach's alpha statistics of 0.850 (TSK-J17) and 0.919 (TSK-J11). For concurrent validity, significantly strong correlations were demonstrated between the TSK-J versions and PCS total score and subscales (r = 0.602-0.680). For known-group validity, as hypothesized, significantly higher TSK-J scores were observed in persons with depressive mood, somatic symptoms, and longer treatment period.

CONCLUSIONS

The present analysis showed that the Japanese versions of the TSK-J17 and TSK-J11 were psychometrically reliable and valid for detecting fear of movement in the Japanese population suffering from neck to back pain due to a motor vehicle accident.

Borderline personality disorder and chronic pain: a practical approach to evaluation and treatment

Patients with chronic pain present a spectrum of complexity that can be overwhelming for the individual practitioner. These patients require thoughtful care and a comprehensive treatment plan. This complexity should be acknowledged, not avoided, and the patient should be engaged, not shunned. A practical approach will assist in developing expertise and proceeding empathically. The presence of a superimposed personality disorder significantly increases the difficulty of caring for these patients. Studies investigating the prevalence of borderline personality disorder in patients with chronic pain averaged 30 %, highlighting the importance of being able to effectively treat this patient population. Appropriate management of these patients should focus on a collaboration to practice productive behaviors despite intense emotional distress. Longitudinal research provides a foundation for an optimistic prognosis that can be enhanced with this rehabilitative approach.

Psychometric properties of the Japanese version of the Fear-Avoidance Beliefs Questionnaire (FABQ)

BACKGROUND

The Fear-Avoidance Beliefs Questionnaire (FABQ) is useful for measuring fear-avoidance beliefs in patients with low back pain (LBP); however, no psychometrically validated Japanese version is available. The objective of this study was to evaluate reliability and validity of the Japanese version of the FABQ for use with Japanese workers with LBP.

METHODS

This was conducted as a web-based survey. Both confirmatory and exploratory factor analysis were performed to examine domain structure of the Japanese version of the FABQ. For reliability, internal consistency was assessed with Cronbach's alpha coefficient. For concurrent validity, correlation coefficients between the FABQ and the Pain Catastrophizing Scale (PCS) were calculated. For known-group validity, the relationship between FABQ score and clinical variables such as pain and depression was examined.

RESULTS

Analyses were based on responses of 1,786 adult Japanese workers with LBP. Factor analysis using the principal factor method with promax rotation revealed two factors, work and physical activity, in accordance with the domain structure of the original version of the scale. For reliability, acceptable internal consistency was demonstrated with Cronbach's alpha coefficient of 0.882 and 0.783 for each subscale. For concurrent validity, significantly moderate correlations were demonstrated between FABQ subscales and PCS subscales (r = 0.30-0.39). For known-group validity, as hypothesized, significantly higher FABQ subscale scores were observed in workers who had stronger pain, who experienced routine work disability with sick leave, who experienced recurrence of LBP, and who had depressed mood.

CONCLUSIONS

This analysis showed that the Japanese version of the FABQ is psychometrically reliable and valid to detect fear-avoidance beliefs in Japanese workers with LBP.

Exploring differences in pain beliefs within and between a large nonclinical (workplace) population and a clinical (chronic low back pain) population using the pain beliefs questionnaire

BACKGROUND

Beliefs, cognitions, and behaviors relating to pain can be associated with a range of negative outcomes. In patients, certain beliefs are associated with increased levels of pain and related disability. There are few data, however, showing the extent to which beliefs of patients differ from those of the general population.

OBJECTIVE

This study explored pain beliefs in a large nonclinical population and a chronic low back pain (CLBP) sample using the Pain Beliefs Questionnaire (PBQ) to identify differences in scores and factor structures between and within the samples.

DESIGN

This was a cross-sectional study.

METHODS

The samples comprised patients attending a rehabilitation program and respondents to a workplace survey. Pain beliefs were assessed using the PBQ, which incorporates 2 scales: organic and psychological. Exploratory factor analysis was used to explore variations in factor structure within and between samples. The relationship between the 2 scales also was examined.

RESULTS

Patients reported higher organic scores and lower psychological scores than the nonclinical sample. Within the nonclinical sample, those who reported frequent pain scored higher on the organic scale than those who did not. Factor analysis showed variations in relation to the presence of pain. The relationship between scales was stronger in those not reporting frequent pain.

LIMITATIONS

This was a cross-sectional study; therefore, no causal inferences can be made.

CONCLUSIONS

Patients experiencing CLBP adopt a more biomedical perspective on pain than nonpatients. The presence of pain is also associated with increased biomedical thinking in a nonclinical sample. However, the impact is not only on the strength of beliefs, but also on the relationship between elements of belief and the underlying belief structure.

Improved physical activity in patients treated for chronic pain by spinal cord stimulation

The objective of this study was to objectively assess the physical activity of daily living in chronic pain patients treated with spinal cord stimulation (SCS). Changes in pain and spontaneous physical activity following SCS were evaluated under real life conditions. Five series of measurements were performed before the implant (baseline) and at one, three, six, and 12 months after the implantation of an SCS system. Compared to baseline values, physical activity increased consistently during the entire follow-up period. The time spent walking and standing was statistically increased after six months (p < 0.01) and the time spent lying decreased significantly (p < 0.001) at the same time. The average total walking distance increased up to 389% at 12 months, reaching statistical significance (p < 0.05) after three months. The stride length and the speed increased (p < 0.01) at all times. We conclude that the reduction in pain intensity due to SCS is associated with a progressive and sustained improvement in physical activity. j.

Validity and reliability of the Fear-Avoidance Beliefs Questionnaire (FABQ) in workers with upper extremity injuries

INTRODUCTION

Fear Avoidance Beliefs (FAB) have been associated with increased pain, dysfunction and difficulty returning to work in Upper Extremity (UE) injures. The FABQ is used to assess FAB, but its measurement properties have not been established in UE. The purpose of this study is to evaluate the reliability and validity of the FABQ to screen UE compensated injured workers for FAB.

METHODS

Consenting workers attending a specialty clinic completed a modified FABQ, QuickDASH (Disability), SPADI Pain Score and von Korff Chronic Pain Grade (Pain), SF-36v2 (General Health), and Work Instability Scale (Job Instability). A sub-sample of workers (n = 48) completed the FABQ 2 weeks later for test-retest reliability.

RESULTS

187 workers; 54.0% male; mean age 45.2 (sd 9.68); 56% were currently working. Mean subscale scores (FABQ-Work [FABQ-W]/FABQ-Physical Activity [FABQ-PA]) were 35/42 and 20/24. Ceiling effects (23%/38%) existed in both subscales. Cronbach's alphas were 0.75/0.78. Test-retest analysis (ICC(2,1)) was lower than desired (0.52/0.59). Construct validation was supported by a moderate correlation between FABQ-W/FABQ-PA and QuickDASH Work Module (0.51/0.42) and WIS (0.46/0.38) in those currently working. Low correlations were found between the subscales measures of pain (SPADI: 0.24/0.23; Chronic Pain Grade: 0.25/0.25), and SF-36 MCS (-0.25/-0.30).

CONCLUSIONS

Although FAB is an important concept to measure in compensated UE injured workers, the FABQ had limitations in this population as there was a high ceiling effect, and lower than desired reliability for individual discrimination. A priori hypotheses around construct validity were rejected for 16/22 concepts tested.

Fear-avoidance beliefs and pain coping strategies in relation to lower back problems in a South African steel industry

The objective was to determine the association between the prevalence of lower back problems (LBP), fear-avoidance beliefs and pain coping strategies using an analytical cross-sectional epidemiological study among a group of 366 workers in a South African stainless steel industry. Outcome (LBP) was defined using a questionnaire and a functional rating index. Exposure to psychosocial risk was determined using the Fear-Avoidance Beliefs (FABQ) and Coping Strategies (CSQ) questionnaires. Multivariate logistic regression analyses for LBP indicated the following significant risk factors: work-related fear-avoidance beliefs (OR 3.40; 95% CI 2.20-5.25), catastrophizing (1.31; 1.01-1.7) and pain coping self statements (1.47; 1.16-1.87). Significant protective associations were found for increased activity levels (OR 0.57; 95% CI 0.42-0.78). These findings have utility in preventative screening procedures to identify workers with such beliefs and coping strategies who are at risk for prolonged work restrictions.

Predicting work status following interdisciplinary treatment for chronic pain

The effectiveness of interdisciplinary treatments for chronic pain is well established. In general, these treatments decrease psychosocial distress and increase physical abilities. Further, return to work rates following interdisciplinary treatment tend to be quite high. Previous studies have highlighted a number of factors that individually influence return to work rates; however, there is a need for more comprehensive and unified models that allow an evaluation of the inter-relations among these factors. The present investigation examined how demographic and treatment outcome variables interacted to influence post-treatment return to work rates in a sample of individuals with chronic pain following interdisciplinary treatment. Results indicated that patient age, lifting ability, pain duration, depression level, and reported disability were individually related to return to work; however, when these variables were evaluated relative to one another, level of depression and patient age had the best ability to predict post-treatment work status. These results add to the literature by specifically highlighting post-treatment factors that best discriminate patients who had returned to work from those that had not. Furthermore, they provide evidence that general emotional distress is perhaps the most important predictor of work status following treatment.

Barriers to rehabilitation and return to work for unemployed chronic pain patients: A qualitative study

This paper explores the perceived barriers to return to work presented by unemployed patients with chronic musculoskeletal pain. The findings are based on one to one in depth semi-structured interviews conducted with patients from four sites in the UK. Interview data were recorded from 38 patients (15 male, 23 female) aged between 29 and 62 years the sample included patients who had participated in a vocational rehabilitation scheme, those who had refused to participate and a nai ve group. Patients were in receipt of long-term social welfare benefits (incapacity benefits) and recruited via local Job Centres. The mean duration of work absence was over 5 years. The data was transcribed and analysed by means of thematic analysis. Several themes were identified as barriers to return to work from the data including pain related issues, uncertainty (both financial and physical), the healthcare system, interaction with benefits providers, perceptions of employers and personal limitations. The uncertainty and the pain condition itself were the overarching barriers from which other obstacles stemmed. This is the first qualitative study of long term unemployed benefit recipients with chronic pain. Others authors have reported psychosocial factors as barriers to work among disabled populations however, this qualitative study has identified barriers specific to unemployed chronic pain patients. The themes identified will help with the planning and development of future initiatives for returning chronic pain patients to employment.

Comparison of work-related fear-avoidance beliefs across different anatomical locations with musculoskeletal pain

BACKGROUND

The influence of work-related fear-avoidance on pain and function has been consistently reported for patients with musculoskeletal low back pain. Emerging evidence suggests similar influences exist for other anatomical locations of musculoskeletal pain, such as the cervical spine and extremities. However, research is limited in comparing work-related fear-avoidance and associations with clinical outcomes across different anatomical locations. The purpose of this study was to examine the associations between work-related fear-avoidance, gender, and clinical outcomes across four different musculoskeletal pain locations for patients being treated in an outpatient physical therapy setting.

METHODS

This study was a secondary analysis of data obtained prospectively from a cohort of 313 participants receiving physical therapy from an outpatient clinic.

RESULTS

No interaction was found between gender and anatomical location of musculoskeletal pain on work-related fear-avoidance scores. Work-related fear-avoidance scores were higher in the cervical group versus the lower extremity group; however, there were no other differences across anatomical locations. Work-related fear-avoidance influenced intake pain intensity in patients with spine pain but not extremity pain. Conversely, work-related fear-avoidance influenced intake function for participants with extremity pain but not spine pain. Similar results were observed for change scores, with higher work-related fear-avoidance being associated with more, not less, change in pain and function for certain anatomical locations.

CONCLUSION

These findings suggest that work-related fear-avoidance is similar for patients experiencing musculoskeletal pain. However, associations between work-related fear-avoidance and clinical outcomes may differ based on the anatomical location of that pain. Further, increased work-related fear-avoidance may not be indicative of poor clinical outcomes for this type of patient population.

Use of Job-Specific Functional Capacity Evaluation to Predict the Return to Work of Patients With a Distal Radius Fracture

OBJECTIVE. We examined the predictive validity of a job-specific functional capacity evaluation (FCE) in relation to the return to work of patients with a distal radius fracture.

METHOD. Return-to-work recommendations for 194 participants with a distal radius fracture were based on FCE performance. Three months after the evaluation, participants were contacted to ascertain their employment status to examine the predictive validity of each FCE-based rating.

RESULTS. The recommendation return to previous job (94.83%) was correct more often than the recommendations do not work at the moment (60.47%), change job (52.63%), and return to previous job with modifications (9.38%). A longer period from injury to FCE and compensable injury reduces the predictive ability of job-specific FCE.

CONCLUSION. Job-specific FCE shows a better predictive validity in relation to the return to work of patients with a specific injury, such as a distal radius fracture, than of patients with a nonspecific injury.

Biopsychosocial factors and perceived disability in saleswomen with concurrent low back pain

Objectives

To quantify disability level in salespeople with concurrent low back pain (LBP) and to determine the relative associations between demographic, occupational, psychosocial and clinical factors and back disability. LBP is the most common cause of work-related disability in people under 45 years of age and the most expensive cause of work-related disability, in terms of workers' compensation and medical expenses. Evidence suggests high prevalence of LBP in salespeople.

Methods

A cross-sectional survey was conducted in which 184 saleswomen with a current episode of self-reported LBP working in a large up-scale department store filled out a battery of 6 self-administered questionnaires and received a standardised physical examination.

Results

Saleswomen with concurrent LBP had low disability levels. Factors significantly associated with disability were pain intensity, measured by a visual analogue scale, in the past week (p < 0.001), physical and mental health status (p < 0.001, p = 0.003, respectively), fear avoidance scores for both work and physical activities (p = 0.031, p = 0.014, respectively), past history of LBP (p = 0.019), and self-reported frequency of pushing or pulling objects placed in high positions during work (p = 0.047). A significant level (45%) of the variance in disability status was explained by these variables.

Conclusion

In clinical management of LBP workers who required prolonged standing, such as salespeople, clinicians should look for modifiable risk factors associated with disability. Specific measures need to be taken to prevent disability due to LBP among salespeople.

Fear of pain as a prognostic factor in chronic pain: conceptual models, assessment, and treatment implications

Chronic pain is a pervasive health care issue affecting over 50 million Americans and costing more than $100 billion dollars annually in lost productivity and health care costs. As a financially and emotionally taxing condition, the families and friends of people with chronic pain, as well as society at large, are affected. Current theory supports the role of biological, psychological, and environmental factors in the etiology, exacerbation, and maintenance of chronic pain. Recently, the specific role of pain-related fear in pain experience has received increasing attention. This article summarizes current understanding of the role of pain-related fear in the onset of acute pain incidents, the transition of acute pain to chronic, and the pain severity and disability of patients with ongoing chronic pain conditions. Treatments demonstrated to reduce pain-related fear are presented, evidence demonstrating their efficacy at reducing disability and pain severity are summarized, and recent criticisms of the fear-avoidance model and future directions are considered.

The influence of psychological factors on pre-operative levels of pain intensity, disability and health-related quality of life in lumbar spinal fusion surgery patients

OBJECTIVES

To assess the extent to which perceived pain and psychological factors explain levels of disability and health-related quality of life (HRQOL) in patients scheduled for lumbar fusion surgery, and to test the hypothesis that relationships between pain intensity, mental health, fear of movement/(re)injury, disability and HRQOL are mediated by cognitive beliefs and appraisals.

DESIGN

Cross-sectional, correlation study.

SETTING

Orthopaedic outpatient setting in a tertiary hospital.

PARTICIPANTS

One hundred and seven chronic back pain patients scheduled for lumbar fusion surgery.

MEASURES

Visual analogue scale for pain intensity, Short Form 36 mental health subscale, Tampa Scale for Kinesiophobia, Back Beliefs Questionnaire, Self-efficacy Scale, Coping Strategy Questionnaire, Oswestry Disability Index and European Quality of Life Questionnaire.

RESULTS

The group effect of multiple mediators significantly influenced the relationships between pain intensity and mental health, fear of movement/(re)injury, functional disability and HRQOL. Pain catastrophising significantly mediated the relationship between pain intensity and mental health, control over pain significantly mediated the relationship between mental health and functional disability, self-efficacy and pain outcome expectancy significantly mediated the relationship between mental health and HRQOL, and self-efficacy also significantly mediated the relationship between pain intensity, fear of movement/(re)jury and functional disability. The model explained 28, 30, 52 and 42% of the variation in mental health, fear of movement/(re)injury, functional disability and HRQOL, respectively.

CONCLUSIONS

This study highlights the strong influence and mediation roles of psychological factors on pain, mental health, fear of movement/(re)injury, disability and HRQOL in patients scheduled for lumber fusion. Future research should focus on screening as well as pre- and post-operative interventions based on these psychological factors for the potential improvement of lumber fusion surgery outcomes.

Participation during major technological change and low back pain

The development of IT involves major changes in many work settings. Theories of organizational change predict negative consequences of change-related work load on back pain to be less when employees participate in the planning and implementation of change. In a longitudinal field study the effects of participation in the introduction of a new internet service were tested. 29 employees (16 f, 13 m) of a municipal office were studied before, at the end of, and 6 months after implementation of an electronic service. Their participation in the planning and implementation of the project, psychosocial working conditions and back pain were assessed using standardized validated questions. 15 employees said that they had no influence on the project or were only informed of it, while 14 employees said that they could make suggestions, or even take part in decision-making. The two groups did not differ in experience of back pain six months before the project was started, but the group with low participation possibilities had significantly more back pain after the implementation of the project (p=0.021). There was no change in back pain in those employees who had sufficient possibilities of participation. Prevention of work related back pain during phases of technological change should involve employees in planning and implementation.

The impact of adolescent chronic pain on functioning: disentangling the complex role of anxiety

A number of adolescents with chronic pain have clinically significant disability across physical, social, and academic activities, and pain severity only explains a portion of the variance in functioning. Thus, it is important to identify therapeutic options to improve adolescents' functioning. In contrast to studies with adults with chronic pain, research in pediatric pain has not consistently found anxiety to be a good predictor of pain-related disability. The present study evaluated pain, anxiety, and functioning in 222 adolescents with chronic pain. Results indicated that pain was consistently and linearly related to disability across measures of physical and social functioning, school attendance, and physician visits. The relation between anxiety and functioning was complex; increased anxiety was related to poorer physical and social functioning and was related to fewer physician visits, although it was not associated with school attendance. Additional analyses revealed that anxiety serves to moderate the relation between pain and functioning. Specifically, at high anxiety, pain was not related to functioning, but at low anxiety, pain consistently predicted disability. In other words, highly anxious adolescents were functioning poorly regardless of the level of pain. The moderating role of anxiety highlights a number of research and clinical possibilities to explore with adolescents with chronic pain-related disability.

PERSPECTIVE

Data suggest that high anxiety is associated with poor functioning irrespective of pain intensity. At low anxiety, higher pain predicted greater disability. Anxiety is important to assess when investigating potential reasons for pain-related disability.

A review of assessment tools of illness representations: are these adapted for a work disability prevention context?

INTRODUCTION

Musculoskeletal disorders are among the main causes of short- and long-term disability.

AIM

Identify the methods for assessing multidimensional components of illness representations.

METHODS

An electronic literature search (French, English) from 1980 to the present was conducted in medical, paramedical and social science databases using predetermined key words. After screening titles and abstracts based on a specific set of criteria, sixty-four articles were reviewed.

RESULTS

Qualitative approaches for assessing illness representation were found mainly in the fields of anthropology and sociology and were based on the explanatory models of illness. The interviews reviewed were: the Short Explanatory Model Interview, the Explanatory Model of Illness Catalogue and the McGill Illness Narrative Interview. Quantitative approaches were found in the health psychology field and used the following self-administered questionnaires: the Survey of Pain Attitudes, the Pain Beliefs and Perceptions Inventory, the Pain Beliefs Questionnaire, the Fear-Avoidance Beliefs Questionnaire, the Implicit Model of Illness Questionnaire, the Illness Perception Questionnaire, including its derivatives, and the Illness Cognition Questionnaire.

CONCLUSION

This review shows the actual use and existence of multiple interviews and questionnaires in assessing multidimensional illness representations. All have been used and/or tested in a medical context but none have been tested in a work disability context. Further research will be needed to determine their suitability for use in a work disability context.

Versão brasileira do Fear Avoidance Beliefs Questionnaire

O objetivo deste estudo foi investigar as propriedades psicométricas e validar a versão em português do Fear Avoidance Beliefs Questionnaire (FABQ-Brasil): um instrumento de avaliação sobre as crenças e medos dos indivíduos com dor lombar e de como esta dor pode afetar suas atividades físicas, subescala FABQ-Phys, e ocupacionais, subescala FABQ-Work. O questionário foi traduzido para o português segundo metodologia recomendada e aplicado em 53 indivíduos com dor lombar crônica não específica. Coeficientes de correlação intraclasse (CCI) do teste-reteste e consistência interna do instrumento (a de Cronbach) foram adequadas, tanto para a FABQ-Phys (0,84 e 0,80, respectivamente) quanto para a FABQ-Work (0,91 e 0,90, respectivamente). A regressão múltipla stepwise revelou correlação significativa entre todos os itens isolados e suas respectivas subescalas, com a variação dos escores em cada uma delas sendo explicada em 99% pelo conjunto de seus itens. Correlação de Pearson entre as subescalas não foi significativa, mas entre estas e a intensidade da dor (escala visual numérica) e a incapacidade física (Questionário de Roland-Morris-Brasil) foi significativa e positiva. Portanto, o FABQ-Brasil apresentou propriedades psicométricas adequadas para ser utilizado na população brasileira com dor lombar crônica.

Chronic pain

Physiatrists frequently see patients who have chronic pain, and the physiatric approach is highly relevant to pain management. This article is directed toward physiatrists who do not specialize in pain management. It discusses the epidemiology of pain in patient groups often treated by physiatrists, pathophysiologic processes underlying chronic pain, the assessment of chronic pain patients, and selected treatments for chronic pain.

Applying centrality of event to persistent pain: a preliminary view

Living with persistent pain is a complex experience. Based on clinical observations, persistent pain is often described as a stressful life event that has significantly altered how patients view themselves and the world around them. The Centrality of Event Scale (CES) assesses how much a stressful life event serves as a turning point in the individual's life, forms a reference point for personal identity, and affects the attribution of meaning to other life experiences. In this study, 47 patients with persistent pain were asked to complete the CES using "the experience of persistent pain" as the designated stressful life event. Data analyses revealed patients scoring high on the CES (ie, those who viewed persistent pain as a central life event) were significantly more likely to experience higher levels of pain intensity (r = .35, P = .02), life interference due to pain (r = .50, P = .002), and psychological distress (r = .46, P = .001). Additional analyses revealed that the CES was a significant predictor of life interference due to pain and psychological distress even after controlling for the effects of age, sex, education, and pain intensity.

PERSPECTIVE

The experience of persistent pain can serve as a major turning point in patients' lives, affect patients' interpretations of other life events, and become a key component of patients' identities. The results of this study indicate that centrality of event, a relatively new construct, could improve our understanding of persistent pain.

Changes in cognitive-behavioral factors and muscle activation patterns after interventions for work-related neck-shoulder complaints: relations with discomfort and disability

OBJECTIVES

Knowledge regarding the working mechanism of an intervention is essential for obtaining a better understanding of the intervention and contributes to optimize its outcome. This study aimed at investigating whether changes in cognitive-behavioral factors and muscle activation patterns after myofeedback training and ergonomic counseling were associated with outcome, in subjects with work-related musculoskeletal neck-shoulder complaints.

METHODS

Seventy-nine symptomatic subjects received either myofeedback with ergonomic counseling (Mfb/EC) or ergonomic counseling alone (EC). Outcome measures discomfort and disability, and process factors catastrophizing, pain control, fear-avoidance beliefs, and muscle activation patterns were assessed at baseline, after the interventions (T0), and at 3 months follow-up (T3). Mixed modeling techniques were used for analysis.

RESULTS

Outcome in terms of discomfort and disability was generally comparable between both interventions. Catastrophizing was significantly reduced and fear-avoidance beliefs about work slightly increased after the interventions, but no consistent changes in muscle activation patterns were observed. Changes in discomfort were especially associated with changes in catastrophizing at T0 and T3, but R(2) was low (<0.14). Reduced catastrophizing at T0 and T3, and also reduced fear-avoidance beliefs about work at T3, were related to reduced disability (R(2) between 0.30 and 0.40). No differences between the two intervention groups were observed.

CONCLUSIONS

Intervention effects were generally non-specific and findings suggested that cognitive-behavioral factors underlie the outcome of these interventions rather than changes in muscle activation patterns. Emphasizing these factors during therapy may increase the beneficial outcome of occupational interventions.

Rehabilitation of injured workers with chronic pain: a stage of change phenomenon

OBJECTIVE

This study was designed to explore the stages of change involved in return to work (RTW) for a group of workers who had been suffering from chronic pain.

METHOD

The participants were 67 (mean age = 42.67) injured workers who participated in a six-week RTW program. Assessments of the participants on various measures were conducted before and during the program, and at the end of the follow-up period (3 months post-program).

RESULTS

The overall RTW rate of the participants was 65.7%. Most importantly, the participants' RTW outcomes were found to be significantly predicted by their readiness for RTW (action) at the baseline. In the third week, their RTW was significantly predicted by their confidence in returning to work and their readiness for RTW (action). By the sixth week, their RTW outcomes were predicted by their readiness for RTW (pre-contemplation).

CONCLUSION

The results enable us to better understand the stage-of-change factors that might influence injured workers' resumption of a productive work role and the rehabilitation process of RTW.

Work and family support systems and the prevalence of lower back problems in a South African steel industry

INTRODUCTION

Back complaints are a common in society.

METHODS

An analytical cross-sectional epidemiological study was carried out among 366 steel plant workers to examine the prevalence and association between lower back problems (LBP) and family and workplace related psychosocial risk factors.

RESULTS

Using inclusive and stringent definitions for LBP, point prevalence was 35.8% and 15.3%, respectively. Logistic regression analyses indicated significant adjusted odd ratios (OR) for negative perceptions of workplace support (2.32; CI 1.09-4.92), unexpected events (2.58; CI 1.19-5.59) and working under time pressures and deadlines (2.83; CI 1.24-6.48). A significant protective association was found for control over the order and pace of working tasks (OR 0.30; CI 0.14-0.63). A significant univariate association was further found between LBP and negative perceptions of family (1.97; CI 1.06-3.68) support.

CONCLUSION

These findings suggest that workers who feel more in control on the job and who have good family and workplace support systems in tact are less likely to experience LBP. Supervisors are therefore encouraged to develop appropriate support and organizational systems which may be an inexpensive, but potentially beneficial, means of reducing worker stress and LBP.

Representations: an important key to understanding workers' coping behaviors during rehabilitation and the return-to-work process

INTRODUCTION

Every year many workers are excluded from work because of a work disability attributable to a musculoskeletal disorder (MSD). Factors associated with the development and persistence of the work disability can be related to the worker, work environment, compensation policies, healthcare system and insurance system. Workers' understanding/representations of their disability are associated with coping behaviors aimed at helping them adapt to or solve their health problem. A representation is a complex, organized entity incorporating thoughts, beliefs, and attitudes regarding a particular subject. Representations have been studied in anthropology, sociology and psychology since the 1960s, but often in a compartmentalized way. These representations provide an important key to understanding what motivates workers during rehabilitation and the return-to-work process. To build upon disciplinary knowledge and better understand workers' efforts to cope with their persistent disability, this article therefore aims to pool the different knowledge available on the illness representation concept, from the fields of anthropology, sociology and psychology in order to gain a better understanding of its application in the MSD context.

METHODS

An electronic literature search (French, English) from 1960 on was conducted in medical, paramedical and social science databases (MedLINE, PsychINFO, CINAHL, etc.) using predetermined key words. After screening abstracts based on a set of criteria, content analysis was performed on the 131 articles retained.

RESULTS

The theoretical models and approaches can be divided into three categories: (1) personal experience; (2) interactionist; and (3) sociocultural. The models found in sociology and anthropology are mainly descriptive and developed in a medical context, and only rarely in an occupational health context. However, these models could add elements to psychosocial models that are more dynamic and oriented toward understanding the reasons behind specific behaviors.

CONCLUSION

Bridging the gap between these disciplines will help us achieve a new level of knowledge that will, by taking social interactions into account, enhance understanding of workers' representations, and the behaviors they adopt to manage their MSD-related disability.

A systematic review of measures used to assess chronic musculoskeletal pain in clinical and randomized controlled clinical trials

There are many types of pain assessments available to researchers conducting clinical trials, ranging from simple, single-item Visual Analog Scale (VAS) questions through extensive, multidimensional inventories. The primary question addressed in this survey of top-tier medical journals was: Which pain assessments are most commonly used in trials? Articles addressing chronic musculoskeletal pain in clinical trials were identified in 7 major medical journals for the year 2003. A total of 50 studies (1476 total original research articles reviewed) met selection criteria, and from these we identified 28 types of pain assessments. Selected studies were classified according to the dimensions of pain assessed, the type of scale and descriptors/anchors used, and the reporting period specified. The most frequently used assessments were the single-item VAS and the Numeric Rating Scale; multidimensional inventories were used infrequently. There was considerable variability in the instructions patients received about the period to consider when evaluating their pain, and many studies provided only cursory information about their assessments in the methods. Overall, it appears that clinical trials use simple measures of pain and that there is no widely accepted standard for clinical pain assessment that would facilitate comparison of outcomes across trials.

PERSPECTIVE

This review highlights the heterogeneity of pain outcome measures used and the abundance of single-item measures in clinical trials. Although there are many pain outcome measures available to clinical researchers, more consistency in the field should be encouraged so that results between studies can be compared.

Prediction of function in daily life following multidisciplinary rehabilitation for individuals with chronic musculoskeletal pain; a prospective study

BACKGROUND

The prevalence of chronic musculoskeletal pain is high, with widespread negative economic, psychological, and social consequences for the individual. It is therefore important to find ways to predict the outcome of rehabilitation programmes in terms of function in daily life. The aims of this study were to investigate the improvements over time from multidisciplinary rehabilitation in terms of pain and function, and analyse the relative impact of individual and psychosocial factors as predictors of function in daily life in individuals with chronic musculoskeletal pain.

METHODS

A prospective study was conducted among one hundred and forty three (N = 143) musculoskeletal pain patients. Measures of pain, function, and functional health status were obtained at baseline, after 5 weeks of intensive training, at the end of the 57-week rehabilitation programme, and at a 1 year follow-up, using validated self-administrated measures. Linear regression analysis was applied to investigate the relative impact of musculoskeletal pain, individual-, and psychosocial factors in function.

RESULTS

The participants studied showed a significant increase in function during the 57 weeks rehabilitation period. There was also a significant increase in function from the end of the rehabilitation period (57th week) to the one year follow-up measures. Pain intensity associated significantly with pain experience over all measurement periods. High levels of pain intensity (beta = .42**) and pain experience (beta = .37*), and poor psychological capacity (beta = -.68*) at baseline, as well as poor physiological capacity (beta = -.44**) and high levels of anxiety (beta = .48**) and depression (beta = .58***) at the end of the rehabilitation program were the most important prognostic factors of variance in functioning over the 4 measurement periods.

CONCLUSION

The data suggest that physical capacity, emotional distress and coping skills should be priority areas in rehabilitation programmes to improve functioning in daily life.

Lower back problems and work-related risks in a South African manganese factory

An analytical cross-sectional epidemiological study carried out among 109 manganese plant workers aimed to examine the prevalence and association between lower back problems (LBP) and occupational risk factors. Outcome was defined using a guided questionnaire and a functional rating index. Exposure to occupational risk factors was determined using self-reported questionnaires and workstation analyses. Multivariate logistic regression analyses indicated significant adjusted odds ratios (OR) for prolonged 90 degrees trunk flexion (OR 2.16; CI 1.15-4.05); manual handling (1.89; 1.17-3.08); load carriage (1.54; 1.08-2.19); and lifting (4.61; 1.37-15.47). The findings illustrate regional and occupational specifics of risk for LBP, and indicate that self-selection or adaptation to task-specific demands could possibly lead to observations of ergonomically relevant risk factors, which do not necessarily yield statistically significant associations with LBP. The findings further support multi-modal preventative approaches.

The Fear-Avoidance Model of Musculoskeletal Pain: Current State of Scientific Evidence

Research studies focusing on the fear-avoidance model have expanded considerably since the review by Vlaeyen and Linton (Vlaeyen J. W. S. & Linton, S. J. (2000). Fear-avoidance and its consequences in chronic musculoskeletal pain: a state of the art. Pain, 85(3), 317--332). The fear-avoidance model is a cognitive-behavioral account that explains why a minority of acute low back pain sufferers develop a chronic pain problem. This paper reviews the current state of scientific evidence for the individual components of the model: pain severity, pain catastrophizing, attention to pain, escape/avoidance behavior, disability, disuse, and vulnerabilities. Furthermore, support for the contribution of pain-related fear in the inception of low back pain, the development of chronic low back pain from an acute episode, and the maintenance of enduring pain, will be highlighted. Finally, available evidence on recent clinical applications is provided, and unresolved issues that need further exploration are discussed.

Factors predicting work ability following multidisciplinary rehabilitation for chronic musculoskeletal pain

INTRODUCTION

This study aimed to investigate the outcome and outcome predictors of multidisciplinary rehabilitation in terms of working ability.

METHODS

One hundred and forty three (n=143) patients with musculoskeletal pain (mean age=45.7, SD=8.9) were included. Work status, pain, functional health status and psychosocial factors were collected previous to treatment, after a 5 week intensive training and a 52 week follow-up period. Demographics and data on personal characteristics were also collected.

RESULTS

Workability increased from 57.4 to 80% during treatment period. Stepwise multivariate logistic regression indicated that age, sleeplessness, cognitive function, overall health, pain experience, and anxiety were the strongest predictors of work ability. Pain severity and depression were not found to be significant predictors of work ability.

CONCLUSIONS

These data suggest that emotional distress, cognitive function and overall health are important priority areas in rehabilitation programmes to improve work ability.

Perceptions of work and family assistance and the prevalence of lower back problems in a South African manganese factory

An analytical cross-sectional epidemiological study was carried out among 109 manganese plant workers to examine the prevalence and association between lower back problems (LBP) and family and workplace related psychosocial risk factors. Outcome (LBP) was defined using a guided questionnaire and a functional rating index. Exposure to family and workplace related psychosocial risk was determined using the Occupational Risk Factor (ORFQ) and APGAR questionnaires for work and family support. Using inclusive and stringent definitions for perceived LBP, point prevalence was 37.6% and 29.4%, respectively. Only 8 cases of LBP were, however recorded officially over a 7-yr period (1996-2003). Multivariate analyses indicated a high, but non-significant odds ratio (OR) for negative perceptions of workplace support OR 3.29 (CI 0.95-11.30). A positive, non-significant, association for negative perceptions of family support (2.56; CI 0.69-9.52) and a protective, but non-significant, association for control over the order and pace of working tasks (OR 0.40; CI 0.12-1.35) was found. These findings together with the under-reporting, leads one to conclude that work hardening and a cultural ethos of non-complaining among manual labourers, moderates the association between LBP and the aetiological factors studied.

Injury-related fear-avoidance, neuroticism and burn-specific health

Dysfunctional beliefs such as fear-avoidance (i.e. fear of re-injury) and personality traits such as neuroticism are risk factors for poor health. However, there is little information regarding associations with poor perceived health after severe burn and what level of fear-avoidance is associated with poor health. In this study, we investigated fear-avoidance and neuroticism regarding their associations with post-burn health. Participants were 86 recovered burn patients and data were collected by a postal survey. Post-burn health was assessed with the nine subscales of the Burn Specific Health Scale-Brief (BSHS-B). In logistic regressions, fear-avoidance was related to poorer health in six subscales assessing both physical and psychosocial problems. Neuroticism was associated with poorer health in three subscales assessing mainly psychosocial problems. Chi-square analyses showed that participants with a moderate or high level of fear-avoidance >or=1.0 (out of 4) were more likely to describe their health as poor and had a longer sick leave than those with a fear-avoidance level of <1.0. In summary, fear-avoidance was associated with poorer health even at moderate levels and was associated with several aspects of post-burn health.

Are functional capacity evaluations affected by the patient's pain?

Functional capacity evaluations (FCE) are comprehensive batteries of performance-based tests used commonly to inform return-to-work decisions for injured workers. As many people undergoing FCE have painful musculoskeletal conditions limiting their work ability, pain becomes a critical factor in the assessment of function. This paper considers the available literature related to the influence of pain on FCE, which clearly indicates FCEs are behavioral assessments influenced by pain intensity and other pain-related constructs. Increasing pain levels are consistently associated with reduced FCE performance levels. As such, for purposes of claims adjudication, FCE should not be considered a purely "objective" indicator of functional impairment independent of subject or evaluator perceptions. FCE may have some value for facilitating return-to-work or re-integrating chronically disabled workers into the workforce, although pain factors must be taken into consideration when making predictions about future work status. Shorter FCEs could potentially be as effective as more lengthy protocols.

Impact of Opioid Use on Outcomes of Functional Restoration

OBJECTIVES

To examine the effect of opioid use on psychological function, physical functioning, and return-to-work outcomes of a multidisciplinary rehabilitation program (MRP) for chronic pain.

METHODS

The participants were 127 patients with on-the-job injuries who had completed an MRP between 2001 and 2003. Opioid use was controlled by the patients' treating physicians (who were not affiliated with the MRP) and was assessed via patient self-report at the time of admission to the program and discharge. Other measures included pretreatment and posttreatment assessments of depression, pain severity, perceived disability, and physical ability (floor-to-waist lifting capacity). Return-to-work outcomes were obtained via follow-up phone calls approximately 6 months posttreatment.

RESULTS

Significant improvements from pretreatment to posttreatment were evidenced on all psychological and physical measures for both opioid users and nonusers. Further, there were no significant posttreatment differences between opioid and nonopioid users on psychological, physical, or return-to-work outcomes.

DISCUSSION

The role of opioids in the treatment of chronic pain continues to be controversial. Despite a lack of definitive data on their effectiveness, opioids continue to be prescribed, and thus patients using opioids continue to present for multidisciplinary rehabilitation. Although further exploration is warranted, results of the current study suggest that opioid use during rehabilitation does not necessarily preclude treatment success.

The prognostic value of depressive symptoms, fear-avoidance, and self-efficacy for duration of lost-time benefits in workers with musculoskeletal disorders

BACKGROUND

The psychological factors of depressive symptoms, fear-avoidance, and self-efficacy are deemed to be important in the work disability process. However, the prognostic value of these factors for time on benefit is not well understood.

AIMS

To analyse the prognostic value of psychological factors for the number of days on total compensation benefit over a 12 month period.

METHODS

In a longitudinal study of 187 workers receiving total compensation benefits due to musculoskeletal disorders, the prognostic value of psychological factors measured 4-5 weeks post-injury for duration on total compensation benefit over 12 months was analysed. Cox proportional hazard regression analyses were conducted. Special emphasis was given to variable selection and to the analysis of confounding effects of potential prognostic variables.

RESULTS

The final model indicated that increased depressive symptoms and poorer physical health significantly increase the number of days on total benefit. Confounders included in the final model were pain and fear of income loss. In the final model the impact of fear-avoidance ceased to be significant when work related variables were included in the fully adjusted model. This illustrates that interrelationships between variables must be taken into account when building multivariate prognostic models. The addition of work related variables to the model did not result in any major changes in the adjusted model, which suggests that when measured 4-5 weeks post-injury, psychological and physical health factors are strong predictors of time on benefits, while work conditions are less important.

CONCLUSION

Results suggest that the presence of depressive symptoms and poor physical health in workers on benefit due to musculoskeletal disorders increases the number of days on total compensation benefits significantly, when controlling for confounding variables.

Prognostic factors for duration of sickness absence due to musculoskeletal disorders

OBJECTIVE

The purpose of this prospective cohort study with 1-year follow-up was to determine prognostic factors for duration of sickness absence due to musculoskeletal disorders.

METHODS

Workers were included when on sickness absence of 2 to 6 weeks due to musculoskeletal disorders. A self-administered questionnaire was used to collect personal and work-related factors, pain, functional disability, and general health perceptions. Statistical analysis was done with Cox proportional hazard regression with an interaction variable with time for every risk factor of interest. Univariate and multivariate analyses were performed on musculoskeletal disorders and, separately, for low back pain.

RESULTS

The main factors that were associated with longer sickness absence were older age, gender, perceived physical workload, and poorer general health for neck, shoulder and upper extremity disorders, and functional disability, sciatica, worker's own perception of the ability of return to work, and chronic complaints for low back pain. Workers with a high perceived physical work load returned to work increasingly slower over time than expected, whereas workers with a high functional disability returned to work increasingly faster over time.

CONCLUSIONS

High pain intensity is a major prognostic factor for duration of sickness absence, especially in low back pain. The different disease-specific risk profiles for prolonged sickness absence indicate that low back pain and upper extremity disorders need different approaches when applying intervention strategies with the aim of early return to work. The interaction of perceived physical workload with time suggests that perceived physical workload would increasingly hamper return to work and, hence, supports the need for workplace interventions among workers off work for prolonged periods.