Expectancies mediate the relationship between perceived injustice and return to work following whiplash injury: A 1-year prospective study

The impact of perceived injustice on pain and psychological outcomes after traumatic injury: a longitudinal analysis

ABSTRACT

Individuals' appraisals regarding the injustice of their pain or physical injury have emerged as a significant risk factor for worse physical and psychological outcomes. Injustice appraisals are defined by perceptions of external blame for pain or injury and viewing pain or injury as a source of irreparable loss. To date, research on the impact of injustice appraisal has been primarily cross sectional, and existing longitudinal studies have examined injustice appraisals at only 2 time points in the context of rehabilitation treatment. This study examined the trajectory of injustice appraisals in 171 patients admitted for traumatic injury at admission, as well as 3, 6, and 12 months after discharge and examined injustice appraisals as a potential moderator of recovery after injury. Findings can be summarized as follows: First, injustice perception was largely stable in the 12 months after hospital discharge. Second, elevated injustice perception was associated with decreased recovery in pain intensity and depressive symptomatology over the study period but did not moderate changes in pain catastrophizing or posttraumatic stress symptomatology over time. This study is the first naturalistic prospective analysis of injustice appraisal following trauma admission within the American healthcare system. Findings indicate that injustice appraisals do not naturally decrease in the aftermath of traumatic injury and may be a risk factor for poorer physical and psychological recovery. Future research should examine additional sociodemographic and psychosocial factors that may contribute to elevated injustice appraisal, as well as ways of addressing the potential deleterious impact of injustice appraisals in treatment settings.

Effect of perceived injustice-targeted pain neuroscience education compared with biomedically focused education in breast cancer survivors: a study protocol for a multicentre randomised controlled trial (BCS-PI trial)

INTRODUCTION

Current treatments for pain in breast cancer survivors (BCSs) are mostly biomedically focused rather than biopsychosocially driven. However, 22% of BCSs with pain are experiencing perceived injustice, which is a known predictor for adverse pain outcomes and opioid prescription due to increased maladaptive pain behaviour. Educational interventions such as pain neuroscience education (PNE) are suggested to target perceived injustice. In addition, motivational interviewing can be an effective behavioural change technique. This trial aims to examine whether perceived injustice-targeted PNE with the integration of motivational interviewing is superior to biomedically focused pain education in reducing pain after 12 months in BCS with perceived injustice and pain. In addition, improvements in quality of life, perceived injustice and opioid use are evaluated, and a cost-effectiveness analysis will finally result in a recommendation concerning the use of perceived injustice-targeted PNE in BCSs with perceived injustice and pain.

METHODS AND ANALYSIS

This two-arm multicentre randomised controlled trial will recruit female BCS (n=156) with pain and perceived injustice. Participants will be randomly assigned to perceived injustice-targeted PNE or biomedically focused pain education in each centre. Both interventions include an online session, an information leaflet and three one-to-one sessions. The primary outcome (pain), secondary outcomes (quality of life, perceived injustice and outcomes for cost-effectiveness analysis) and explanatory outcomes (pain phenotyping, sleep, fatigue and cognitive-emotional factors) will be assessed at baseline and at 0, 6, 12 and 24 months postintervention using self-reported questionnaires online. Treatment effects over time will be evaluated using linear mixed model analyses. Additionally, a cost-utility analysis will be done from a healthcare payer and societal perspective.

ETHICS AND DISSEMINATION

The ethical agreement was obtained from the Main Ethics Committee (B.U.N.1432020000068) at the University Hospital Brussels and all other participating hospitals. Study results will be disseminated through presentations, conferences, social media, press and journals.

TRIAL REGISTRATION NUMBER

NCT04730154.

"No Man's Land": the experiences of persons injured in a road traffic crash wanting to return to work in Queensland, Australia

PURPOSE

This study aimed to explore individuals' experiences of return to work (RTW) following minor to serious road traffic injury (RTI) in Queensland, Australia; seek their recommendations if any, on how to provide support for RTW after RTI; and identify the strategies and resources used to return and remain at work after their RTI.

METHODS

The interpretive description methodological approach was used. Semi-structured interviews were conducted with eligible participants (n = 18) aged 18-65 y who had experienced a minor to serious RTI at least 6 months earlier. Thematic analysis was used to analyse the data.

RESULTS

Five themes emerged: (1) physical and mental consequences of RTI negatively impact RTW; (2) money matters; (3) RTW support makes a difference; (4) feeling alone and confused in the RTW process; and (5) several strategies and resources helped with return/stay at work after RTI. Regular contact and cooperation with employers and insurers, job modifications, and using social media to obtain information and social support were helpful RTW strategies. Participants recommended timely and appropriate medical care, financial assistance, and educational support.

CONCLUSIONS

Policy changes to reduce financial stress, increase employer support, and improve injured individuals' knowledge following a RTI are recommended in jurisdictions operating a fault-based scheme.IMPLICATIONS FOR REHABILITATIONThis study identified several factors that can influence return to work (RTW) following minor to serious road traffic injuries (RTIs) in a jurisdiction operating a fault-based compensation scheme.Legislative changes that provide financial assistance to all injured people regardless of their fault-status could reduce financial stress arising from reduced work ability following a road traffic injury.Increasing employer' awareness of the importance of return to work for those with road traffic injuries and reimbursement for possible expenses of providing RTW support for these individuals could increase employability of injured people following RTI.Improving injured individuals' knowledge about return-to-work processes after a road traffic injury could accelerate recovery and return to work.

Qualitative Examination of the Experience of Perceived Injustice Following Disabling Occupational Injury

PURPOSE

The primary objective of this study was to explore individuals' perspectives on the factors, situations or events that contributed to their perceptions of injustice following occupational injury.

MATERIALS AND METHODS

The study sample consisted of 30 participants (18 women, 12 men) who had submitted a time-loss claim for a work-related musculoskeletal injury. Participants with elevated scores on a measure of perceived injustice were interviewed about the factors that contributed to their sense of injustice. A thematic analysis was conducted to identify the broad classes of situations or events that participants experienced as unjust in the weeks following occupational injury.

RESULTS

Three dominant themes emerged from the interviews: (1) Invalidation, (2) Undeserved suffering and (3) Blame. Inductively derived subthemes reflected specific dimensions of post-injury experiences that contributed to participants' sense of injustice.

CONCLUSIONS

Given that suffering and invalidating communication are potentially modifiable factors, there are grounds for optimism that intervention approaches can be developed to prevent or reduce perceptions of injustice in the aftermath of debilitating injury. The development of intervention approaches that are effective in preventing or reducing perceptions of injustice holds promise of contributing to more positive recovery outcomes in individuals who have sustained debilitating work injuries.

Perceived Injustice in Cancer Survivors: Population-Specific Cut-Off Score and Relations with Personal Factors, Symptoms and Quality of Life-A Cross-Sectional Study

Fatigue and pain are the most common side effects impacting quality of life (QoL) in cancer survivors. Recent insights have shown that perceived injustice (PI) can play a substantial role in these side effects, but research on cancer survivors is scarce. Furthermore, guidelines for recognizing clinically relevant levels of PI in cancer survivors are missing. The aims of this study are to provide a clinically relevant cut-off for PI and to explore relationships between personal characteristics, symptoms, and QoL with PI. This multicenter, cross-sectional study uses the Injustice Experience Questionnaire (IEQ), Numeric Pain Rating Scale (NPRS), Patient-Specific Complaints (PSC), Multidimensional Fatigue Index (MFI), and European Organization for Research and Treatment of Cancer QoL Questionnaire-C30 (EORTC-QLQ-C30). A clinical cut-off for PI was identified based on the 75th percentile of IEQ scores. Univariate and multivariate regressions explored the relationship between PI and personal characteristics (sex, age, cancer type, treatment type), symptoms (pain intensity, fatigue), and QoL (daily activity complaints, cancer-related QoL). Cancer survivors (n = 121) were included, and a cut-off of 20 was identified. Significant indirect associations were found between chemotherapy, NPRS, PSC, MFI, and EORTC-QLQ-C30 with PI. In the multivariate model, only MFI (B = 0.205; 95% CI: 0.125-0.018) and age (B = 0.086; 95% CI: -0.191-0.285) maintained a significant association with PI.

Recovery expectations can be assessed with single-item measures: findings of a systematic review and meta-analysis on the role of recovery expectations on return-to-work outcomes after musculoskeletal pain conditions

ABSTRACT

The objective of this systematic review is to quantify the association between recovery expectations and return-to-work outcomes in adults with musculoskeletal pain conditions. In addition, this review has the second objective to compare the predictive utility of single-item and multi-item recovery expectation scales on return-to-work outcomes. Relevant articles were selected from Embase, PsycINFO, PubMed, Cochrane, and manual searches. Studies that assessed recovery expectations as predictors of return-to-work outcomes in adults with musculoskeletal pain conditions were eligible. Data were extracted on study characteristics, recovery expectations, return-to-work outcomes, and the quantitative association between recovery expectations and return-to-work outcomes. Risk of bias was assessed using the Effective Public Health Practice Project. Odds ratios were pooled to examine the effects of recovery expectations on return-to-work outcomes. Chi-square analyses compared the predictive utility of single-item and multi-item recovery expectation scales on return-to-work outcomes. Thirty studies on a total of 28,741 individuals with musculoskeletal pain conditions were included in this review. The odds of being work disabled at follow-up were twice as high in individuals with low recovery expectations (OR = 2.06 [95% CI 1.20-2.92] P < 0.001). Analyses also revealed no significant differences in the predictive value of validated and nonvalidated single-item measures of recovery expectations on work disability (χ 2 = 1.68, P = 0.19). There is strong evidence that recovery expectations are associated with return-to-work outcomes. The results suggest that single-item measures of recovery expectations can validly be used to predict return-to-work outcomes in individuals with musculoskeletal pain conditions.

Exploring the perspectives of key stakeholders in returning to work after minor to serious road traffic injuries: a qualitative study

PURPOSE

This qualitative study conducted in Queensland, Australia aimed to explore various stakeholders' perspectives on (1) the barriers and facilitators of Return to Work (RTW) for injured persons following minor to serious Road Traffic Injuries (RTI) in a fault-based scheme, and to investigate the changes needed to better support RTW following RTI.

METHODS

The study was performed using the Interpretive Description methodological approach. Data were collected during interviews (n = 17), one focus group (n = 4), and an open-ended survey (n = 10) with five categories of stakeholders: treating health providers, workplace representatives, legal representatives, rehabilitation advisors, and insurers. Participants were eligible to participate if they had at least one year of employment history in their respective profession in Queensland, Australia, and were experienced in assisting the RTW of people with RTI. Thematic analysis was used to analyse the data.

RESULTS

Seven themes were extracted reflecting the barriers and facilitators of RTW along with stakeholders' recommendations to address these barriers. These themes were: (1) knowledge is power; (2) stakeholder expertise; (3) early and appropriate treatment matters; (4) insurers could do better; (5) necessity of employers' support; (6) fix the disjointed system; (7) importance of individual factors pre- and post- injury. The main barriers identified were stakeholders' insufficient communication and knowledge on RTW process following RTI.

CONCLUSIONS

Individual and system barriers identified in this study suggest that RTW after RTI occurs in a complex system requiring the commitment of all stakeholders. This is particularly important for managing knowledge-related barriers by provision of high quality and easily accessible information about the RTW process, disability schemes, and the nature of RTI.

The Influence of Expectancies on Pain and Function Over Time After Total Knee Arthroplasty

OBJECTIVE

Expectancies have a well-documented influence on the experience of pain, responses to treatment, and postsurgical outcomes. In individuals with osteoarthritis, several studies have shown that expectations predict increased pain and disability after total knee replacement surgery. Despite the growing recognition of the importance of expectancies in clinical settings, few studies have examined the influence of expectancies throughout postsurgical recovery trajectories. The objective of the present study was to examine the role of presurgical expectancies on pain and function at 6-week, 6-month, and 1-year follow-ups after total knee arthroplasty.

DESIGN AND PARTICIPANTS

Data were collected from patients scheduled for total knee arthroplasty 1 week before surgery and then at 6 weeks, 6 months, and 1 year after surgery. Correlational and multivariable regression analyses examined the influence of expectancies on patients' perceptions of pain reduction and functional improvement at each time point. Analyses controlled for age, sex, body mass index, presurgical pain intensity and function, pain catastrophizing, anxiety, and depression.

RESULTS

Results revealed that expectancies significantly predicted pain reduction and functional improvement at 1-year follow-up. However, expectancies did not predict outcomes at the 6-week and 6-month follow-ups. Catastrophizing and depressive symptoms emerged as short-term predictors of postsurgical functional limitations at 6-week and 6-month follow-ups, respectively.

CONCLUSIONS

The results suggest that targeting high levels of catastrophizing and depressive symptoms could optimize short-term recovery after total knee arthroplasty. However, the results demonstrate that targeting presurgical negative expectancies could prevent prolonged recovery trajectories, characterized by pain and loss of function up to 1 year after total knee arthroplasty.

Perceived Injustice After Mild Traumatic Brain Injury

OBJECTIVE

To examine perceived injustice and its associations with self-reported symptoms and return to work at 3 months after injury in a prospectively recruited sample of patients with mild traumatic brain injury (mTBI).

DESIGN

Observational study.

SETTING

TBI outpatient unit.

PARTICIPANTS

Adult patients aged 18 to 68 years with mTBI (n = 100) or orthopedic injury ([OI]; n = 34).

MAIN MEASURES

The Injustice Experience Questionnaire (IEQ) and its associations with the Rivermead Post Concussion Questionnaire (RPQ), Beck Depression Inventory-Second Edition (BDI-II), PTSD Checklist-Civilian Version (PCL-C), and Pain Visual Analog Scale (PVAS). Information on injury-related characteristics, compensation seeking and litigation, and return-to-work status was also collected.

RESULTS

Median IEQ total score was 3 (range, 0-23) in the mTBI group and 2.5 (range, 0-25) in the OI group. In the mTBI group, IEQ was significantly correlated with RPQ (rs = 0.638, P < .01), BDI-II (rs = 0.612, P < .01), PCL-C (rs = 0.679, P < .01), and PVAS (rs = 0.232, P < .05). The association between IEQ and PCL-C (rs =0.797, P < .01) and BDI-II (rs = 0.395, P < .05) was also found in the OI group. In both groups, patients who were still on sick leave at 3 months after injury tended to report higher perceived injustice (IEQ total score) than patients who had returned to work or studies. However, this difference did not reach statistical significance.

CONCLUSIONS

Perceived injustice is associated with self-reported symptoms in patients with mTBI. Our results suggest that perceived injustice could be a relevant construct to consider in clinical management of patients with mTBI. Also, perceived injustice could be a potential target for psychological interventions promoting recovery after mTBI.

Barriers and Facilitators Associated with Return to Work Following Minor to Serious Road Traffic Musculoskeletal Injuries: A Systematic Review

Purpose To identify factors impeding or facilitating Return to Work (RTW) after minor to serious musculoskeletal Road Traffic Injuries (RTI). Methods Six electronic databases were searched for studies published 1997-2020. Quantitative and qualitative studies were included if they investigated barriers or facilitators associated with RTW in people with minor to serious musculoskeletal RTI aged over 16 years. Methodological quality was assessed using McMaster Critical Review Form for Quantitative studies and McMaster Critical Review Form for Qualitative Studies. Results are presented narratively as meta-analysis was not possible. Results Eleven studies (10 quantitative and 1 qualitative) were included. There was strong evidence that individuals with higher overall scores on the (short-form or long-form) Örebro Musculoskeletal Pain Questionnaire (ÖMPQ) at baseline were less likely to RTW, and individuals with higher RTW expectancies at baseline were more likely to RTW after musculoskeletal RTI. There was weak evidence for higher disability levels and psychiatric history impeding RTW after musculoskeletal RTI. Conclusions Post-injury scores on the ÖMPQ and RTW expectancies are the most influential factors for RTW after minor to serious musculoskeletal RTI. There is a need to identify consistent measures of RTW to facilitate comparisons between studies.

Return to work a bumpy road: a qualitative study on experiences of work ability and work situation in individuals with chronic whiplash-associated disorders

Background

Work resumption is a big challenge in the rehabilitation process for individuals with whiplash-associated disorders (WAD). To better meet the needs of individuals with WAD in their return to work process, more knowledge on their experiences and perspectives is needed. The aim of this study was to explore the experiences of work ability and the work situation of individuals who participated in a neck-specific exercise programme for chronic WAD.

Methods

This qualitative study has an exploratory and descriptive design based on data collected through open-ended interviews with 17 individuals with chronic WAD. Data were analysed inductively using conventional content analysis.

Results

Analysis of the data yielded the following five categories related to the participants’ narratives on their experiences of work ability and their work situation: Return to work – a process of setbacks and bureaucracy; The need to be understood by health care professionals, and to receive a treatment plan; Individual resources are important for work ability; The consequences of reduced work ability; and Working conditions are important for work ability.

Conclusion

Individuals with chronic WAD often struggle to return to work. Emotional and practical support from stakeholders is imperative and needs to be strengthened. Participating in a neck-specific exercise programme, including being acknowledged and receiving information about WAD, could positively affect the work ability of WAD sufferers. This study has provided management strategies to improve the ability to work for individuals with chronic WAD, and highlights the need to incorporate a healthy and sustainable return to work in the rehabilitation of individuals with WAD, thereby making their return to work a success.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12889-021-10821-w.

Pain Acceptance Partially Mediates the Relationship Between Perceived Injustice and Pain Outcomes Over 3 Months

OBJECTIVES

Perceived injustice is a maladaptive cognitive appraisal of pain or injury, characterized by attributions of blame, unfairness, severity of loss, and irreparability of loss. Research suggests that perceived injustice may negatively affect pain outcomes by inhibiting the development of pain-related acceptance. The current study aimed to extend cross-sectional research by testing whether pain acceptance mediates the effects of perceived injustice on pain-related outcomes longitudinally.

MATERIALS AND METHODS

Data was analyzed from a prospective study to examine the potential mediating role of pain acceptance on recovery 3 months after an episode of low back pain. Using Mechanical Turk, we recruited participants who experienced an episode of back pain within the preceding 2 weeks, 343 of whom completed measures of perceived injustice, pain acceptance, pain ratings, and quality of life at each of 3 timepoints (recruitment, 1 mo later, and 3 mo later). Path analyses were conducted to examine pain acceptance at 1 month as a potential mediator of the relationship between perceived injustice at recruitment and pain intensity, disability, and depressive symptoms at 3 months.

RESULTS

Results indicated that perceived injustice at recruitment was directly related to pain intensity, disability, and depressive symptoms 3 months later, and that pain acceptance partially mediated these relationships.

DISCUSSION

Although these findings provide further support for pain acceptance as a buffer for the deleterious effects of perceived injustice, they also highlight that adjunctive mechanisms should be investigated to provide more comprehensive clinical insight.

Navigating the Intersection Between Persistent Pain and the Opioid Crisis: Population Health Perspectives for Physical Therapy

The physical therapy profession has recently begun to address its role in preventing and managing opioid use disorder (OUD). This topic calls for discussion of the scope of physical therapist practice, and the profession's role, in the prevention and treatment of complex chronic illnesses, such as OUD. OUD is not just an individual-level problem. Abundant scientific literature indicates OUD is a problem that warrants interventions at the societal level. This upstream orientation is supported in the American Physical Therapy Association's vision statement compelling societal transformation and its mission of building communities. Applying a population health framework to these efforts could provide physical therapists with a useful viewpoint that can inform clinical practice and research, as well as develop new cross-disciplinary partnerships. This Perspective discusses the intersection of OUD and persistent pain using the disease prevention model. Primordial, primary, secondary, and tertiary preventive strategies are defined and discussed. This Perspective then explains the potential contributions of this model to current practices in physical therapy, as well as providing actionable suggestions for physical therapists to help develop and implement upstream interventions that could reduce the impact of OUD in their communities.

A Systematic Review of the Association Between Perceived Injustice and Pain-Related Outcomes in Individuals with Musculoskeletal Pain

Objective

A growing body of literature shows that justice-related appraisals are significant determinants of pain-related outcomes and prolonged trajectories of recovery. We conducted a systematic review of the literature assessing the relationship between perceived injustice and pain-related outcomes in individuals with musculoskeletal pain.

Design and Participants

A search of published studies in English in PubMed, PsychInfo, Embase, and Cochrane Database of Systematic Reviews from database inception through May 2019 was performed. Search terms included “perceived injustice,” “injustice appraisals,” “perceptions of injustice,” and “pain” or “injury.”

Results

Thirty-one studies met inclusion criteria. Data for a total of 5,969 patients with musculoskeletal pain were extracted. Twenty-three studies (71.9%) reported on individuals with persistent pain lasting over three months, and 17 studies (53.1%) reported on individuals with injury-related musculoskeletal pain. Significant associations were found between perceived injustice and pain intensity, disability and physical function, symptoms of depression and anxiety, post-traumatic stress disorder, quality of life and well-being, and quality of life and social functioning.

Conclusions

This systematic review summarizes the current evidence for the association between perceived injustice and pain-related outcomes. There is strong evidence that perceived injustice is associated with pain intensity, disability-related variables, and mental health outcomes. Implications and directions for future research are discussed.

Associations between the injustice experience questionnaire and treatment term in patients with acute Whiplash-associated disorder in Japan: Comparison with Canadian data

Introduction

This study aimed to investigate the differences in the Injustice Experience Questionnaire (IEQ) scores during the early period after the diagnosis of Whiplash-associated disorder (WAD) between Japanese and Canadian samples, and the associations between the IEQ scores and treatment terms in Japanese patients with acute WAD.

Methods

We used secondary data for the IEQ scores of Canadian patients with acute WAD. In Japan, we collected data from 85 consecutively enrolled patients with acute WAD, and their treatment terms were collected; these referred to the number of days between the date of injury and the closure date of the insurance claim and the number of treatment visits. Before treatment, the Numeric Rating Scale, Neck Disability Index, Hospital Anxiety and Depression Scale, IEQ, and Euro Quality of Life five-dimensional questionnaire were administered. The variables were subjected to multivariate analysis with each treatment term.

Results

The IEQ scores were higher in Japan than in Canada. Through multiple regression analysis, IEQ scores were independently correlated with treatment terms. The optimal cutoff point of the IEQ scores for a prolonged treatment term was 21 and 22 points, respectively.

Conclusions

The IEQ scores were associated with treatment terms in patients with acute WAD in Japan.

Social support buffers the negative influence of perceived injustice on pain interference in people living with HIV and chronic pain

Introduction:

A growing literature attests to the overwhelming prevalence of disabling chronic pain among people living with HIV (PLWH), yet very little is known about psychosocial contributors to poor chronic pain outcomes in this population. Pain-related perception of injustice may promote pain interference by hindering engagement in daily activities among individuals with chronic pain. Social support has been shown to buffer the negative impact of harmful beliefs on well-being and facilitate adjustment to chronic pain.

Objective:

This cross-sectional study tested the buffering hypothesis of social support to determine whether increasing levels of social support mitigate the negative influence of perceived injustice on pain interference.

Methods:

A total of 60 PLWH with chronic pain completed measures of perceived injustice, social support, pain severity, and interference, as well as depressive symptoms.

Results:

In a regression-based model adjusted for age, sex, depressive symptoms, and pain severity, results indicated that social support significantly moderated (ie, buffered) the association between perceived injustice and pain interference (P = 0.028). Specifically, it was found that perceived injustice was significantly associated with greater pain interference among PLWH with low levels of social support (P = 0.047), but not those with intermediate (P = 0.422) or high levels of social support (P = 0.381).

Conclusion:

Pain-related injustice perception reflects harmful beliefs regarding severity of loss consequent to chronic pain development, a sense of unfairness, and irreparability of loss. Access to a social support network may provide an adaptive means of mitigating the negative effects of perceived injustice.

What do you expect? Catastrophizing mediates associations between expectancies and pain-facilitatory processes

BACKGROUND

Pain expectancies are associated with altered pain sensitivity in individuals with chronic pain. However, little is known about the processes by which pain expectancies impact pain processing. This study assessed the association between pain expectancies and temporal summation (TS) of pain, and examined whether pain catastrophizing mediated this association.

METHODS

In this cross-sectional study, participants (437 chronic low back pain [CLBP] patients, 115 controls) completed self-report measures of pain intensity, pain expectancies and pain catastrophizing before undergoing psychophysical pain-testing procedures designed to assess mechanical TS of mechanical pain. Pearson's correlations examined the associations between study variables in CLBP patients and controls. Bootstrapping mediation analyses assessed the mediating role of pain catastrophizing on the association between pain expectancies and TS of pain.

RESULTS

Temporal summation of pain was significantly associated with pain expectancies (r = 0.113) and pain catastrophizing (r = 0.171) in CLBP patients. Results of mediation analyses revealed that pain catastrophizing mediated the relationship between pain expectancies and TS of pain in CLBP patients (ab = 0.309, 95% CI = 0.1222-0.5604), but not in healthy controls (ab = -0.125, 95% CI = -0.5864 to 0.0244).

CONCLUSIONS

The findings from this study suggest that compared to controls, CLBP patients show increased sensitivity to mechanical pain procedures and enhanced pain-facilitatory processing, proving further evidence for changes in central nervous system pain processing in CLBP patients. Our results also suggest that pain catastrophizing may be the mechanism by which pain expectancies are associated with TS of pain in CLBP patients.

SIGNIFICANCE

Individuals with chronic low back pain who expect higher levels of pain and catastrophize about their pain are more likely to experience altered pain sensitivity. Our results point to catastrophizing as a mechanism of action through which psychological factors may operate and lead to the development and maintenance of chronic low back pain.

Examining Injustice Appraisals in a Racially Diverse Sample of Individuals With Chronic Low Back Pain

Injustice perception has emerged as a risk factor for problematic musculoskeletal pain outcomes. Despite the prevalence and impact of chronic low back pain (CLBP), no study has addressed injustice appraisals specifically among individuals with CLBP. In addition, despite racial/ethnic disparities in pain, existing injustice research has relied almost exclusively on white/Caucasian participant samples. The current study examined the associations between perceived injustice and pain, disability, and depression in a diverse community sample of individuals with CLBP (N = 137) -51 (37.2%) white, 43 (31.4%) Hispanic, 43 (31.4%) black or African American). Anger variables were tested as potential mediators of these relationships. Controlling for demographic and pain-related covariates, perceived injustice accounted for unique variance in self-reported depression and disability outcomes, but not pain intensity. State and trait anger, and anger inhibition mediated the association between perceived injustice and depression; no additional mediation by anger was observed. Significant racial differences were also noted. Compared with white and Hispanic participants, black participants reported higher levels of perceived injustice related to CLBP, as well as higher depression and pain-related disability. Black participants also reported higher pain intensity than white participants. Current findings provide initial evidence regarding the role of injustice perception specifically in the context of CLBP and within a racially diverse participant sample. Results highlight the need for greater diversity within injustice and CLBP research as well as research regarding socially informed antecedents of injustice appraisals. Perspective: Perceived injustice predicted worse outcomes in CLBP, with effects partially mediated by anger. Black participants reported worse pain outcomes and higher injustice perception than their white or Hispanic counterparts. Given racial inequities within broader health and pain-specific outcomes, this topic is critical for CLBP and perceived injustice research.

Perceived injustice in chronic pain: an examination through the lens of predictive processing

Chronic pain conditions have been shown to be exacerbated by psychological factors, and a better understanding of these factors can inform clinical practice and improve the efficacy of interventions. The current paper investigates perceived injustice, a novel psychosocial construct, within a framework influenced by the tenets of predictive processing. The proposed conceptual model derived from tenets of predictive processing yields a single hierarchical self-reconfiguring system driven by prediction, which accounts for a wide range of human experiences such as perception, behavior, learning and emotion. This conceptualization can inform the development and implementation of more targeted therapeutic interventions for chronic pain.

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.