Clinical Phenotyping of Youth With New-Onset Musculoskeletal Pain: A Controlled Cohort Study

Who develops chronic pain after an acute lower limb injury? A longitudinal study of children and adolescents

ABSTRACT

Prevention of chronic pain is a major challenge in this area of clinical practice. To do this, we must be able to understand who is most at risk of developing chronic pain after an injury. In this study, we aimed to identify risk factors of chronic pain onset, disability, and pain interference after a lower limb musculoskeletal injury in children and adolescents between 8 to 16 years of age. We assessed biopsychosocial factors including age, sex, pubertal status, anxiety, depression, fear of pain, pain worry, adverse life events, and sleep in children. We also assessed risk factors in parents including parent anxiety, depression, parent pain catastrophising, and protective behaviours. Logistic and hierarchical linear regressions identified risk factors assessed immediately postinjury for outcomes assessed at 3 months postinjury. Fourteen percent (17/118 children) reported chronic pain 3 months after injury. There were significant between-group differences in children with and without chronic pain at baseline. Children with chronic pain reported higher pain intensity, disability, pain interference, child depression, fear of pain, and catastrophic thinking about their pain. Regressions showed child depression and fear of pain at baseline independently predicted chronic pain onset at 3 months, parent protectiveness predicted child pain interference at 3 months, and child depression, poor sleep, parent anxiety and pain catastrophising predicted disability. Most children recover after a lower limb injury, but a minority develop chronic pain predicted by important psychosocial risk factors, which could be addressed to prevent the onset of treatment-resistant chronic pain and disability.

Beliefs About Pain in Pediatric Inflammatory and Noninflammatory Chronic Musculoskeletal Conditions: A Scoping Review

OBJECTIVE

The Common Sense Self-Regulatory Model posits that beliefs about pain influence coping behaviors and subsequent physical and mental health outcomes in children/young people with chronic musculoskeletal conditions. It was unclear how and what beliefs had been investigated in this population, and whether there were similarities and differences in beliefs held about pain by those experiencing inflammatory versus noninflammatory musculoskeletal conditions. This scoping review addressed this gap.

METHODS

A systematic search was conducted using four databases (MEDLINE, PsycINFO, Embase, and CINAHL) in November 2021. Primary studies exploring key stakeholders' (including children, parents, and/or healthcare professionals) beliefs about pain underlying pediatric chronic musculoskeletal conditions were synthesized.

RESULTS

Eighteen articles were identified. Cross-sectional designs were predominantly used to explore beliefs (n = 6). The majority used questionnaires to assess beliefs (n = 12). Beliefs common across musculoskeletal conditions were that children/young people felt their pain was not understood by others, and pain affected their physical functioning. Differences included children/young people and parents thinking they had some ability to control pain, and causal beliefs relating to underlying disease activity. These pain beliefs were more likely to be held in relation to inflammatory diagnoses. In contrast, children/young people and parents were more likely to view pain as uncontrollable, with more uncertainty regarding underlying causes, relating to noninflammatory diagnoses.

CONCLUSIONS

Methods used to explore pain beliefs were inconsistent. Studies identified similarities and differences which appear to be closely related to the underlying diagnosis. Findings justify further exploration to identify potentially modifiable targets to improve pain outcomes in this population.

Associations between Chronic Pain and Attention-Deficit Hyperactivity Disorder (ADHD) in Youth: A Scoping Review

Background: Chronic pain and ADHD are common conditions among youth that negatively impact functioning. This review fills a critical gap by summarizing current research on chronic pain and ADHD comorbidity, and it proposes a conceptual model of shared associations and underlying mechanisms. Objective: The aims of the current study were to: (1) review the extant literature and present estimates of the prevalence of comorbid non-headache chronic pain and ADHD in youth and (2) describe potential shared mechanisms for ADHD and chronic non-headache pain in youth. We also outline future directions to inform future research and interventions directed to youth with comorbid pain and ADHD. Design: A scoping review of the literature was performed in MEDLINE, PsycInfo, and Cochrane Database of Systematic Reviews using a wide range of search terms related to pain, Attention Deficit-Hyperactivity Disorder, childhood, adolescence, and young adulthood. Results: Eleven published studies were included in the review. These studies examined the prevalence of chronic pain among youth with ADHD, the prevalence of ADHD in chronic pain samples, and the association between chronic pain and ADHD among youth. Findings revealed results from studies indicating a higher prevalence of ADHD among youth with chronic pain and a higher prevalence of chronic pain in samples of youth with ADHD. Conclusions: Findings from this scoping review suggest an association between chronic pain and ADHD among youth. Little research was found to examine the etiology of this association. Future studies should examine underlying mechanisms of comorbid chronic pain and ADHD.

Clusters of facilitatory and inhibitory conditioned pain modulation responses in a large sample of children, adolescents, and young adults with chronic pain

Supplemental Digital Content is Available in the Text.

Findings from the current study add to the literature by describing different clinical phenotypes of central pain mechanisms of youth with chronic pain.

Introduction:

When investigating the role of facilitatory and inhibitory pain mechanisms such as conditioned pain modulation (CPM) and temporal summation of pain (TSP), it is important to take both into consideration in a single experimental model to provide the most information on subgroups of patients. Therefore, the objective of this study was to identify subgroups in a large population of pediatric patients with chronic pain based on their facilitatory and inhibitory pain mechanisms and compare them with control subjects.

Methods:

Five hundred twenty-one female subjects and 147 male subjects between 8 and 21 years old underwent a CPM assessment using a 2-minute tonic noxious heat stimulation as the test stimulus and a 2-minute cold-pressor task (CPT) (12°C) as the conditioning stimulus.

Results:

The best partition of clusters of patients was 3 clusters accounting for 27.15% of the total variation in the data. Cluster 1 (n = 271) was best characterized by high pain intensity during the CPT, lack of TSP during the test stimuli, and efficient inhibitory CPM. Cluster 2 (n = 186) was best characterized by low pain intensity during the CPT, lack of TSP during the test stimuli, and efficient inhibitory CPM. Cluster 3 (n = 151) was best characterized by high pain intensity during the CPT, presence of TSP during the test stimuli, and inefficient inhibitory CPM.

Discussion:

A single thermal CPM experimental design can identify combinations of facilitatory and inhibitory pain modulation responses. Findings from the current study add to the literature by describing different clinical phenotypes of central pain mechanisms of youth with chronic pain.

Agile development of a digital exposure treatment for youth with chronic musculoskeletal pain: protocol of a user-centred design approach and examination of feasibility and preliminary efficacy

INTRODUCTION

Chronic pain affects a significant number of children and impacts multiple domains including social, emotional and behavioural functioning, and negatively impacts family functioning. Roughly 5% of youth with chronic pain experience moderate to severe pain-related disability, with pain-related fear and avoidance of activities being identified as substantial barriers to treatment engagement. Evidence supports targeted psychological and physical interventions to address these barriers (eg, graded-exposure treatment), but accessibility to intervention is undermined by a shortage of services outside of urban areas, high treatment-related costs, and long provider waitlists; highlighting the need to develop digitally delivered behavioural intervention, using agile and iterative study designs that support rapid development and timely dissemination.

METHODS AND ANALYSIS

This study seeks to develop an effective and scalable intervention for youth with chronic pain and their caregivers. This paper presents a user-centred protocol for the development and refinement of a digital exposure treatment for youth and caregivers, as well as the study design to examine feasibility and preliminary efficacy of the treatment using single-case experimental design (SCED). Assessments include daily diaries, completed from baseline and daily throughout the intervention (~6 weeks), and at 3-month follow-up, as well as self-report measures completed at baseline, end of intervention and 3-month follow-up. Primary outcomes include treatment satisfaction, treatment expectancy, adherence to daily dairies and functional disability. Secondary outcomes are pain-related fear and avoidance of activities, pain catastrophising and pain acceptance. We will present descriptive and model-based inference analyses, based on SCED reporting guidelines. We will calculate effect sizes for each individual on each outcome. We will examine mean treatment expectancy, credibility and satisfaction scores, and patient drop-out percentage.

ETHICS AND DISSEMINATION

This study is approved by the Institutional Review Board at Stanford University (protocol #53323). Findings will be actively disseminated through peer-reviewed journals, conference presentations and social media.

TRIAL REGISTRATION NUMBER

NCT05079984.

Association between the Use of Quantitative Sensory Testing and Conditioned Pain Modulation and the Prescription of Medication and Interventional Procedures in Children with Chronic Pain Conditions

The evidence supporting the use of pharmacological treatments in pediatric chronic pain is limited. Quantitative sensory testing (QST) and conditioned pain modulation evaluation (CPM) provide information on pain phenotype, which may help clinicians to tailor the treatment. This retrospective study aimed to evaluate the association between the use of QST/CPM phenotyping on the selection of the treatment for children with chronic pain conditions. We retrospectively analyzed the medical records of 208 female patients (mean age 15 ± 2 years) enrolled in an outpatient interdisciplinary pediatric complex pain center. Pain phenotype information (QST/CPM) of 106 patients was available to the prescribing physician. The records of 102 age- and sex-matched patients without QST/CPM were used as controls. The primary endpoint was the proportion of medications and interventions prescribed. The secondary endpoint was the duration of treatment. The QST/CPM group received less opioids (7% vs. 28%, respectively, p < 0.001), less anticonvulsants (6% vs. 25%, p < 0.001), and less interventional treatments (29% vs. 44%, p = 0.03) than controls. Patients with an optimal CPM result tended to be prescribed fewer antidepressants (2% vs. 18%, p = 0.01), and patients with signs of allodynia and/or temporal summation tended to be prescribed fewer NSAIDs (57% vs. 78%, p = 0.04). There was no difference in the duration of the treatments between the groups. QST/CPM testing appears to provide more targeted therapeutic options resulting in the overall drop in polypharmacy and reduced use of interventional treatments while remaining at least as effective as the standard of care.

Using the Parent Risk Screening Measure (PRISM) to Assess Pain-Related Risk Factors in Parents of Youth Seeking Treatment for Acute Musculoskeletal Pain

OBJECTIVES

The Parent Risk Screening Measure (PRISM) rapidly assesses parent distress, psychosocial function, and behaviors associated with child pain-related dysfunction in parents of youth with chronic pain. Recognizing the importance of parent pain-related cognitions and responses to pain during the acute pain period, the current study examined the utility of the PRISM in screening parents of youth with acute pain.

METHODS

Participants were 175 parent-youth dyads taking part in a larger study examining risk and resilience in youth with acute musculoskeletal pain. Parents completed the PRISM and a battery of measures reporting on their child's pain-related disability and cognitions and behaviors in response to their child's pain. Youth reported on their pain, pain-related disability, pain-related fear, catastrophizing, and pain self-efficacy.

RESULTS

PRISM total scores ( M =2.55, SD=2.77) were correlated with many parent and child report measures (eg, protectiveness, catastrophizing, and pain-related fear), with higher scores associated with greater symptoms. Using published PRISM cutoffs, 86.9% of parents were classified as low and 13.13% as elevated risk. t tests revealed significant differences between elevated and low-risk groups on several measures. Moreover, youth of parents in the elevated risk group were more likely to meet clinical cutoffs on pain catastrophizing and fear avoidance measures.

DISCUSSION

Findings suggest the PRISM is useful in screening for parent distress and behaviors associated with elevated pain symptomatology in a pediatric acute musculoskeletal pain sample. The important next steps are to identify the ideal time for administering the PRISM and to examine the associations among PRISM scores and pain outcomes over time.

Phenotyping Chronic Musculoskeletal Pain in Male and Female Adolescents: Psychosocial Profiles, Somatosensory Profiles and Pain Modulatory Profiles

Purpose

A major limitation in treatment outcomes for chronic pain is the heterogeneity of the population. Therefore, a personalized approach to the assessment and treatment of children and adolescents with chronic pain conditions is needed. The objective of the study was to subgroup pediatric patients with chronic MSK pain that will be phenotypically different from each other based on their psychosocial profile, somatosensory function, and pain modulation.

Patients and Methods

This observational cohort study recruited 302 adolescents (10–18 years) with chronic musculoskeletal pain and 80 age-matched controls. After validated self-report questionnaires on psychosocial factors were completed, quantitative sensory tests (QST) and conditioned pain modulation (CPM) were performed.

Results

Three psychosocial subgroups were identified: adaptive pain (n=125), high pain dysfunctional (n=115), high somatic symptoms (n=62). Based on QST, four somatosensory profiles were observed: normal QST (n=155), thermal hyperalgesia (n=98), mechanical hyperalgesia (n=34) and sensory loss (n=15). Based on CPM and temporal summation of pain (TSP), four distinct groups were formed, dysfunctional central processing group (n=27) had suboptimal CPM and present TSP, dysfunctional inhibition group (n=136) had suboptimal CPM and absent TSP, facilitation group (n=18) had optimal CPM and present TSP, and functional central processing (n=112) had optimal CPM and absent TSP. A significant association between the psychosocial and somatosensory profiles. However, no association was observed between the psychosocial or somatosensory profiles and pain modulatory profiles.

Conclusion

Our results provide evidence that adolescents with chronic musculoskeletal pain are a heterogenous population comprising subgroups that may reflect distinct mechanisms and may benefit from different treatment approaches. The combination of screening self-reported questionnaires, QST, and CPM facilitate subgrouping of adolescents with chronic MSK pain in the clinical context and may ultimately contribute to personalized therapy.

Psychosocial and psychophysical assessment in pediatric patients and young adults with chronic back pain: a cluster analysis

Background

Identifying subgroups with different clinical profiles may inform tailored management and improve outcomes. The objective of this study was to identify psychosocial and psychophysical profiles of children and adolescents with chronic back pain.

Methods

One hundred and ninety‐eight patients with chronic back pain were recruited for the study. Pain assessment was mainly conducted in the form of an interview and with the use of validated pain‐related questionnaires assessing their psychosocial factors and disability. All patients underwent mechanical and thermal quantitative sensory tests assessing detection and pain thresholds, and conditioned pain modulation efficacy.

Results

Hierarchal clustering partitioned our patients into three clusters accounting for 34.73% of the total variation of the data. The adaptive cluster represented 45.5% of the patients and was characterized to display high thermal and pressure pain thresholds. The high somatic symptoms cluster, representing 19.2% of patients, was characterized to use more sensory, affective, evaluative and temporal descriptors of pain, more likely to report their pain as neuropathic of nature, report a more functional disability, report symptoms of anxiety and depression and report poor sleep quality. The pain‐sensitive cluster, representing 35.4% of the cohort, displayed deep tissue sensitivity and thermal hyperalgesia.

Conclusions

This study identified clinical profiles of children and adolescents experiencing chronic back pain based on specific psychophysical and psychosocial characteristics highlighting that chronic pain treatment should address underlying nociceptive and non‐nociceptive mechanisms.

Significance

To our current knowledge, this study is the first to conduct cluster analysis with youth experiencing chronic back pain and displays clinical profiles based on specific physical and psychosocial characteristics. This study highlights that in a clinical context, chronic pain assessment should include multiple elements contributing to pain which can be assessed in a clinical context and addressed when pathoanatomical symptoms are unidentifiable.

The Pediatric Pain Screening Tool (PPST) can Rapidly Identify Elevated Pain and Psychosocial Symptomatology in Treatment-Seeking Youth with Acute Musculoskeletal Pain

This cross-sectional study examines the utility of the Pediatric Pain Screening Tool (PPST) for rapidly assessing pain and psychosocial symptomatology in treatment-seeking youth with acute musculoskeletal pain. Participants were 166 youth (10-18 years, 53.6% female) participating in one of two larger cohort studies of youth with acute musculoskeletal pain. Youth completed the PPST and measures of pain, pain-related fear, pain catastrophizing, pain-related disability, and sleep quality. Participants were categorized into PPST risk groups using published cut-offs. ANOVA and chi-square examined associations between PPST risk groups and self-report measures; receiver operating characteristic (ROC) analyses examined associations among PPST scores and clinical reference cut-offs. The PPST classified 28.3% of youth as high, 23.5% as moderate, and 48.2% as low-risk. Females were more likely to be high-risk. ANOVAs revealed differences in clinical factors by PPST risk group particularly differences among youth labeled high versus low-risk. ROC analyses showed the PPST is effective in discriminating "cases" versus "non-cases" on pain-related disability, pain-fear and catastrophizing. Results reveal the PPST is effective for rapidly screening youth with acute pain for pain and psychosocial symptomatology. An important next step will be to examine the validity of the PPST in predicting recovery outcomes of acute pain samples. PERSPECTIVE: This article presents the Pediatric Pain Screening Tool (PPST) as a measure for rapidly screening youth with acute pain for pain and psychosocial symptomatology. The tool categorizes youth into low, moderate or high-risk groups and discriminates among those with versus without clinically significant levels of disability, pain-related fear and catastrophizing.

Perceived Injustice Is Associated With Pain-related Function and Mood in Youth With Acute Musculoskeletal Pain

OBJECTIVES

Perceived injustice (PI), which is one's appraisal of justice or fairness regarding the pain experience, is an emerging area of interest in pediatric pain research. No previous studies have investigated PI in youth with acute pain. To fill this gap, this study examined (1) associations among PI, pain-related function, and psychological function in treatment-seeking youth with acute musculoskeletal (MSK) pain, and (2) the impact of parent-child PI discordance on children's pain and psychosocial function.

MATERIALS AND METHODS

Participants were youth (aged 11 to 17, 55% male) with acute pain (onset <1 mo) recruited from emergency departments or outpatient clinics and participating parents (102 parent-child dyads). Dyads completed study questionnaires within 1 month of the child's pain onset.

RESULTS

Youth-reported PI was significantly correlated with poorer physical and psychosocial quality of life, higher pain catastrophizing, higher fear of pain, increased pain-related disability, and greater depression and anxiety. Furthermore, PI was significantly associated with the physical quality of life, psychosocial quality of life, and pain-related disability. Moreover, discordance in youth and parent ratings of PI was associated with children's psychological and pain-related function. Specifically, compared with Concordant dyads, youth in the Discordant dyads (youth high PI/parent low PI) reported significantly poorer physical quality of life, psychosocial quality of life, higher pain-related disability, depression, anxiety, and pain catastrophizing.

DISCUSSION

These findings reveal that PI in youth with acute MSK pain is associated with quality of life and pain-related disability. Furthermore, results highlight the importance of discordance between youth and parent reports of PI on pain-related functioning.

National Estimates of Chronic Musculoskeletal Pain and Its Treatment in Children, Adolescents, and Young Adults in the United States: Data From the 2007-2015 National Ambulatory Medical Care Survey

OBJECTIVES

To portray physician office visits by young Americans with chronic musculoskeletal pain; to describe clinical management in this group; and to explore factors associated with prescribed treatments.

STUDY DESIGN

Using nationally representative data of ambulatory physician office visits (2007-2015 United States National Ambulatory Medical Care Survey), we identified and cross-sectionally analyzed visits by persons <25 years of age diagnosed with a chronic musculoskeletal pain condition.

RESULTS

There were 28.6 million visits over the 9-year period for chronic musculoskeletal pain for persons <25 years of age, (average 3.2 million visits/year). There were more visits among older age groups, female persons, non-Hispanic White ethnicity/race, and those with more medical visits in the past year. Nonopioid medications were the most frequent treatments in all age groups (range 38.5%-48.8%). Opioids were rarely prescribed for children and adolescents but were prescribed in 23% of visits among young adults (18-24 years of age). Health education and counseling were consistently prescribed at 20% of visits and physical therapy (range 9.5%-23.7%) and other treatments were less frequently prescribed. Age, sex, payment source, and physician specialty were associated with various treatments.

CONCLUSION

There were over 3 million annual visits for chronic musculoskeletal pain in young Americans; these increased with age. Pharmacologic treatment is used more than nonpharmacologic approaches, and opioid prescribing in the 18- to 24-year-old age group approaches estimates in adults with musculoskeletal pain.

The Role of Sleep in the Transition from Acute to Chronic Musculoskeletal Pain in Youth-A Narrative Review

Musculoskeletal pain is common in the general pediatric population and is a challenge to youth, their parents, and society. The majority of children experiencing musculoskeletal pain will recover; however, a small subgroup of youth develops chronic pain. There is limited understanding of the factors that affect the transition from acute to chronic pain in youth. This review introduces sleep deficiency in the acute to chronic pain transition, exploring the potential mediational or mechanistic role and pathways of sleep in this process, including the interaction with sensory, psychological, and social components of pain and highlighting new avenues for treatment. Biological mechanisms include the increased production of inflammatory mediators and the effect on the hypothalamus-pituitary-adrenal (HPA) axis and on the dopaminergic signaling. Psychological and social components include the effect of sleep on the emotional-affective and behavioral components of pain, the negative impact on daily and social activities and coping strategies and on the reward system, increased pain catastrophizing, fear of pain, pain-related anxiety, hypervigilance, and social isolation. Future longitudinal studies are needed to elucidate these mechanistic pathways of the effect of sleep on the transition from acute to chronic pain, which may lead to the development of new treatment targets to prevent this transition.

Exploring the Prevalence of Pediatric Chronic Pain and School Absenteeism for Therapists Working in Schools: A Systematic Review with Meta-Analysis

AIM

To explore the prevalence of school absenteeism for children with chronic pain and to identify the characteristics of children with chronic pain who report absenteeism.

METHODS

Systematic review with meta-analyses of quantitative studies. Studies were included if they reported mean days absent from school in children with chronic pain aged 5-18 years, attending a full-time school program. Quality of evidence was assessed using the Mixed Methods Appraisal Tool. Participant characteristics of age, gender, pain duration, pain type, and data collection setting were collated.

RESULTS

Eighteen quantitative studies involving 2963 children with chronic were included. Studies had moderate to high quality of evidence. Meta-analysis demonstrated 13.28 mean days were spent absent from school in a 60-day period (95% CI 10.21, 16.34) (p < 0.001). Participants were predominantly females (71.8%) aged 14.1 years (SD 2.32). The most experienced pain type was combined headache or head pain (46.9%) and average duration since pain onset was 32.5 months (SD 36.34).

CONCLUSIONS

Children with chronic pain aged 5-18 years are absent for approximately 22% of school days, in a 60-day period. Early, targeted intervention for absenteeism and poor school functioning is recommended. Future research could evaluate the role of school-based therapists in screening at risk students and improving attendance and outcomes.

Parent Factors are Associated With Pain and Activity Limitations in Youth With Acute Musculoskeletal Pain: A Cohort Study

OBJECTIVES

Biopsychosocial models emphasize the influence of parent/family factors on pediatric chronic pain. Little is known about how parent factors differ across the acute to chronic pain continuum, or contribute to youths' pain experience in the acute pain period. The purpose of the study was to describe parent factors in youth with acute musculoskeletal pain (n=84) compared with youth with chronic pain (n=60) and youth without pain (n=61). Further, within the acute pain sample, we tested parent factors as predictors of child pain characteristics, as well as the moderating role of child sex on associations.

METHODS

Participants were 205 youth (age, 10 to 17) and one biological parent per child. Children reported on their own pain and activity limitations. Parents reported on their own chronic pain, somatization, and protective pain responses.

RESULTS

Parents of youth with acute pain had higher prevalence of chronic pain and greater somatization than parents of youth without pain. Parents of youth with acute and chronic pain did not differ. Linear regressions within the acute pain sample revealed presence of parent chronic pain and protective behavior were associated with child pain. Moreover, parent somatization was associated with child activity limitations. Within the acute pain sample, associations between parent protectiveness and child pain were moderated by child sex, with relationships stronger for female children.

DISCUSSION

Findings highlight the importance of parent factors on pain experiences of youth with acute musculoskeletal pain. Future longitudinal research can elucidate temporal associations that underlie how parent factors may impact transition from acute to chronic pain.

Contextual risk among adolescents receiving opioid prescriptions for acute pain in pediatric ambulatory care settings

Many adults with opioid use disorder (OUD) report that their first exposure to opioids was in the course of routine pain treatment in medical care settings. Adolescents receive opioid prescriptions with frequency, but are susceptible to a constellation of unique risks in the context of pain management. This empirical study presents the first cohort of adolescents recruited from ambulatory medical care within 72 h of their receipt of opioids to treat acute pain. The primary aim was to capture a time-sensitive report of the intersection of prescription opioid receipt and contextual risks for opioid misuse related to pain experience, mental health symptoms, and substance use at the adolescent and parental levels. Data were collected from 70 14-19-year-old adolescents and their accompanying parent. Results reflected that 90% of this sample of adolescents reported 2 or more risks and 35% reported 5 or more risks for future opioid misuse. Pain catastrophizing (46%) and alcohol use (40%) and were the most common adolescent-level risk factors; mother history of chronic pain (32%) and parent anxiety (21%) were the most common parent-level risk factors. Past-week parent pain intensity showed the strongest association with adolescent past-week pain intensity; neither was associated with adolescent OUD symptoms. Adolescent pain catastrophizing most reliably predicted OUD symptoms; parent pain interference was also associated. Seventy-one percent of parents reported keeping opioids at home, a relevant risk factor for future misuse. These findings illuminate the intersection between adolescent and parental risks in the context of pediatric opioid prescribing for acute pain management, and provide initial insight into potential points of prevention early in adolescent pain treatment, including avenues by which to inform and enhance prescriber decision-making regarding factors to be weighed in adolescent candidacy for opioid therapy.

Five-year prognosis and impact of adolescent knee pain: a prospective population-based cohort study of 504 adolescents in Denmark

OBJECTIVES

Investigate the prognosis of adolescent knee pain, and evaluate its impact on health, care-seeking and career choices 5 years later.

DESIGN

Pre-registered, prospective cohort study.

SETTING

Population-based cohort initiated in school setting.

PARTICIPANTS

From a cohort of 2200 adolescents aged 15-19 years in 2011, 504 reported knee pain on at least a monthly basis, and were followed prospectively in this cohort study, together with 252 controls who did not have knee pain in 2011.

MAIN OUTCOME MEASURES

Outcomes included the Pain and Symptoms subscales from the Knee injury and Osteoarthritis Outcome Score (KOOS), pain intensity measured with a Numeric Rating Scale, pain frequency, knee-related and health-related quality of life, sports participation, physical activity level, KOOS subscales: Function and Sport/recreation, quality of sleep, healthcare consultations, treatments received for their knee pain, the use of painkillers and impact on choice of job or career.

RESULTS

At follow-up, 358 (71.0%) from the knee pain group and 182 (72.2%) from the control group responded. Of note, 40.5% (95% CI: 35.4% to 45.6%) from the knee pain group reported knee pain 5 years later which was frequent and intense compared with 13.2% (95% CI: 8.2 to 18.1) of the control group. Those from the knee pain group still suffering from knee pain reported poorer physical health (13 points worse on KOOS Function and 30 points worse on KOOS Sport/recreation), stopped or reduced their sports participation because of knee pain (60%), reported worse sleep quality and worse knee-related and general quality of life. In terms of health behaviours, those still with knee pain reported more healthcare consultations. One-third used pain killers regularly, and 15% (95% CI: 12% to 20%) reported that knee pain influenced their choice of job or career.

CONCLUSION

Four out of every 10 adolescents with knee pain still experienced frequent and intense knee pain 5 years later, severe enough to impact health, health behaviours and career choices.

TRAIL REGISTRATION NUMBER

NCT02873143.

Do incident musculoskeletal complaints influence mortality? The Nord-Trøndelag Health study

Background

Musculoskeletal complaints (MSC) are common in the general population, causing a major disease burden to the individual and society. The association between MSC and mortality is still unclear. To our knowledge, no study has hitherto evaluated the association between MSC onset within the last month (incident MSC) on the one hand, and all-cause and cause-specific mortality on the other.

Methods

This prospective population-based cohort study was done using data from the second Nord-Trøndelag Health Study (HUNT2) linked with data from a comprehensive national registry of cause of death. A total of 25,931 participants at risk for incident MSC were included. Hazard ratios (HR) of mortality were estimated for participants with incident MSC using Cox regression based on a mean of 14.1 years of follow-up.

Results

Participants who reported incident MSC did not have an excess mortality compared to those with no MSC in the analyses of all-cause mortality (HR 0.99, 95% CI 0.89–1.10) and cause specific mortality. This was true also after adjustment for several potential confounding factors. No clear association between the number of MSC body sites and mortality was found.

Conclusion

Incident MSC were not associated with an increased mortality, neither for all-cause mortality, nor cause-specific mortality.

A Model of the Intersection of Pain and Opioid Misuse in Children and Adolescents

Despite being a significant public health concern, the role of opioid prescriptions in potentiating risk of opioid misuse in the context of pediatric pain has been under-investigated. To address this gap, the present review identifies theory-based hypotheses about these associations, reviews the extant literature on opioid prescriptions that supports these hypotheses, and provides routes for future empirical studies. A multi-level model of mechanisms through which opioid prescriptions may impact pain and other negative outcomes in youth, including risk for opioid misuse and related problems, is proposed with particular attention paid to the role that psychologists can play in informing policies and developing preventative interventions in healthcare settings.

Perioperative Pain Assessment in a 14-Year-Old Boy with Lumbar Disc Herniation

This case report illustrates the value of a comprehensive perioperative pain assessment composed of quantitative sensory testing and self-reported measures that highlight the impact of pain experienced by a 14-year-old boy suffering from chronic low back pain and sciatica. Before surgery, the pain assessment revealed inefficient endogenous inhibitory pain control with presence of temporal summation of pain. The severe pain was constant and lasted for 18 months. The patient was in a high-anxiety state, and reported significant functional disability and poor sleep quality. Six months after surgery, the patient was pain free. Quantitative sensory testing showed an improvement in his inhibitory pain control with the absence of temporal summation of pain. The patient was no longer anxious, was back to normal functional abilities, and reported good sleep quality. By including neurophysiology and other pain measures, the clinical application of a comprehensive pain assessment can provide objective measurements of treatment efficacy.

Current methodological approaches in conditioned pain modulation assessment in pediatrics

Conditioned pain modulation (CPM) paradigms have been used in various studies with healthy and non-healthy adult populations in an attempt to elucidate the mechanisms of pain processing. However, only a few studies so far have applied CPM in pediatric populations. Studies finding associations with chronic pain conditions suggest that deficiencies in underlying descending pain pathways may play an important role in the development and persistence of pain early in life. Twelve studies were identified using a PubMed search which examine solely pediatric populations, and these are reviewed with regard to demographics studied, methodological approaches, and conclusions reached. This review aimed to provide both clinicians and researchers with a brief overview of the current state of research regarding the use of CPM in children and adolescents, both healthy and clinical patients. The implications of CPM in experimental and clinical settings and its potential to aid in refining considerations to individualize treatment of pediatric pain syndromes will be discussed.

Temporal daily associations among sleep and pain in treatment-seeking youth with acute musculoskeletal pain

Sleep is an important health risk factor. In the context of pediatric chronic pain, sleep is often impaired and temporal daily associations link sleep deficiency to subsequent increased pain. It is unknown whether similar temporal relationships exist for youth with acute pain. Thus, we characterized sleep in youth with acute musculoskeletal (MSK) pain to examine daily sleep-pain associations. Participants were 67 youth (10-17 years) with acute MSK pain (<1 month duration). Youth underwent eight nights of actigraphic sleep monitoring and completed twice daily pain diaries. Generalized linear models tested nighttime sleep as a predictor of morning pain, and evening pain as a predictor of nighttime sleep. Shorter sleep duration and poorer sleep quality predicted higher morning pain intensity. However, evening pain did not predict nighttime sleep, suggesting the strongest temporal association is in the direction of sleep deficiency impacting next-day pain, as has been found in prior research in youth with chronic pain.

Wilson A, M. Palermo T. Predictors of the transition from acute to persistent musculoskeletal pain in children and adolescents: a prospective study

Strategies directed at the prevention of disabling pain have been suggested as a public health priority, making early identification of youth at risk for poor outcomes critical. At present, limited information is available to predict which youth presenting with acute pain are at risk for persistence. The aims of this prospective longitudinal study were to identify biopsychosocial factors in the acute period that predict the transition to persistent pain in youth with new-onset musculoskeletal (MSK) pain complaints. Participants were 88 children and adolescents (age 10-17 years) presenting to the emergency department (n = 47) or orthopedic clinic (n = 41) for evaluation of a new MSK pain complaint (<1 month duration). Youth presented for 2 study visits (T1≤1 month post pain onset; T2= 4-month follow-up) during which they completed questionnaires (assessing pain characteristics, psychological factors, sleep quality) and participated in a laboratory task assessing conditioned pain modulation. Regression analyses tested T1 predictors of longitudinal pain outcomes (pain persistence, pain-related disability, quality of life [QOL]). Results revealed approximately 35% of youth had persistent pain at 4-month follow-up, with persistent pain predicted by poorer conditioned pain modulation and female sex. Higher depressive symptoms at T1 were associated with higher painrelated disability and poorer QOL at T2. Findings highlight the roles of depressive symptoms and pain modulation in longitudinally predicting pain persistence in treatment-seeking youth with acute MSK pain and suggest potential mechanisms in the transition from acute to chronic MSK pain in children and adolescents.

Predictors of the transition from acute to persistent musculoskeletal pain in children and adolescents: a prospective study

Strategies directed at the prevention of disabling pain have been suggested as a public health priority, making early identification of youth at risk for poor outcomes critical. At present, limited information is available to predict which youth presenting with acute pain are at risk for persistence. The aims of this prospective longitudinal study were to identify biopsychosocial factors in the acute period that predict the transition to persistent pain in youth with new-onset musculoskeletal (MSK) pain complaints. Participants were 88 children and adolescents (age 10-17 years) presenting to the emergency department (n = 47) or orthopedic clinic (n = 41) for evaluation of a new MSK pain complaint (<1 month duration). Youth presented for 2 study visits (T1 ≤1 month post pain onset; T2 = 4-month follow-up) during which they completed questionnaires (assessing pain characteristics, psychological factors, sleep quality) and participated in a laboratory task assessing conditioned pain modulation. Regression analyses tested T1 predictors of longitudinal pain outcomes (pain persistence, pain-related disability, quality of life [QOL]). Results revealed approximately 35% of youth had persistent pain at 4-month follow-up, with persistent pain predicted by poorer conditioned pain modulation and female sex. Higher depressive symptoms at T1 were associated with higher pain-related disability and poorer QOL at T2. Findings highlight the roles of depressive symptoms and pain modulation in longitudinally predicting pain persistence in treatment-seeking youth with acute MSK pain and suggest potential mechanisms in the transition from acute to chronic MSK pain in children and adolescents.