Reduction of cervical and respiratory muscle strength in patients with chronic nonspecific neck pain and having moderate to severe disability

Purpose: To investigate whether patients with chronic nonspecific neck pain and having moderate to severe disability have a greater cervical motor function impairment and respiratory disturbances compared with patients with chronic nonspecific neck pain having mild disability and asymptomatic subjects; and the association between these outcomes in patients with chronic nonspecific neck pain and healthy controls.

Methods: Cross-sectional study, 44 patients with chronic nonspecific neck pain and 31 healthy subjects participated. The neck disability index was used to divide the patients into 2 groups: 1) mild disability group (scores between 5 and 14 points); and 2) moderate to severe disability group (scores?>14 points). Cervical motor function was measured by cervical range of motion, forward head posture, neck flexor, and extensor muscle strength. Respiratory function and maximum respiratory pressures were also measured.

Results: Statistically differences were found between the patients with chronic nonspecific neck pain having a moderate to severe disability and the asymptomatic subjects for cervical and respiratory muscle strength. Comparisons between chronic nonspecific neck pain and the asymptomatic groups showed differences for all the variables, except for forward head posture. The regression model determined that strength of cervical flexion explained 36.4 and 45.6% of the variance of maximum inspiratory pressures and maximum expiratory pressures, respectively.

Conclusions: Only the chronic nonspecific neck pain group with moderate to severe disability showed differences compared with the healthy subjects. Neck muscle strength could be a good predictor of respiratory muscle function.

• Implications for rehabilitation

• Neck pain severity could be closely associated with decreased respiratory pressure in patients with chronic nonspecific neck pain.

• These findings suggest a new therapeutic approach for patients with moderate to severe disability, such as respiratory muscle training.

• The regression models show that a simple measurement of neck muscle strength could provide a reasonably accurate prediction for the respiratory function of these patients. Hence, this could provide an easy tool to assess respiratory function to physiotherapists without the need for sophisticated instrumentation.

     

The association between cognitive factors,pain and disability in patients with idiopathic chronic neck pain

Purpose.?The aim of this study was to establish the relationship between known cognitive factors and levels of pain and disability in patients with idiopathic chronic neck pain.

Method.?Ninety-four patients referred for physiotherapy because of chronic neck pain completed measures of pain, disability, catastrophising, pain-related fear, pain vigilance and awareness and self-efficacy beliefs. Hierarchical multiple regression analyses were then performed to establish whether the cognitive factors were significant determinants of levels of pain and disability.

Results.?The cognitive measures were significantly related to levels of pain and disability, explaining 23% of the variance in pain intensity and 30% of the variance in disability. Specifically, greater catastrophising (β?=?0.37, p?<?0.05) and lower pain vigilance and awareness (β?=???0.32, p?<?0.05) were associated with greater pain intensity. Moreover, greater catastrophising (β?=?0.26, p?<?0.05) and lower functional self-efficacy beliefs (β?=???0.34, p?<?0.001) were significantly associated with greater levels of disability.

Conclusions.?Cognitive factors were strongly related to levels of pain and disability in patients with chronic neck pain. In view of this, targeting the modification of these cognitive factors should be an integral part of therapy when treating patients with idiopathic chronic neck pain.     

Psychometric properties of the Neck Disability Index and Numeric Pain Rating Scale in patients with mechanical neck pain

Cleland JA, Childs JD, Whitman JM. Psychometric properties of the Neck Disability Index and numeric pain rating scale in patients with mechanical neck pain.

Objective

To examine the psychometric properties including test-retest reliability, construct validity, and minimum levels of detectable and clinically important change for the Neck Disability Index (NDI) and the numeric rating scale (NRS) for pain in a cohort of patients with neck pain.

Design

Single-group repeated-measures design.

Setting

Outpatient physical therapy (PT) clinics.

Participants

Patients (N=137) presenting to PT with a primary report of neck pain.

Interventions

Not applicable.

Main Outcome Measures

All patients completed the NDI and the NRS at the baseline examination and at a follow-up. At the time of the follow-up, all patients also completed the global rating of change, which was used to dichotomize patients as improved or stable. Baseline and follow-up scores were used to determine the test-retest reliability, construct validity, and minimal levels of detectable and clinically important change for both the NDI and NRS.

Results

Test-retest reliability was calculated using an intraclass correlation coefficient (ICC) (NDI ICC=.50; 95% confidence interval [CI], .25-.67; NRS ICC=.76; 95% CI, .51-.87). The area under the curve was .83 (95% CI, .75-.90) for the NDI score and .85 (95% CI, .78-.93) for the NRS score for determining between stable and improved patients. Thresholds for the minimum clinically important difference (MCID) for the NDI were 19-percentage points and 1.3 for the NRS.

Conclusions

Both the NDI and NRS exhibit fair to moderate test-retest reliability in patients with mechanical neck pain. Both instruments also showed adequate responsiveness in this patient population. However, the MCID required to be certain that the change in scores has surpassed a level that could be contributed to measurement error for the NDI was twice that which has previously been reported. Therefore the ongoing analyses of the properties of the NDI in a patient population with neck pain are warranted.     

Neck pain and disability: a cross-sectional survey of the demographic and clinical characteristics of neck pain seen in a rheumatology clinic

This hospital-based cross-sectional cohort study examines the clinical and demographic features of neck pain, disability (using the Northwick Park neck pain questionnaire) and relationships to handicap in employment. Of 173 consecutive referrals to a rheumatology clinic with neck pain, 70% had neck/arm pain without neurological involvement, 13% other conditions, 11% nerve involvement and 5% other spinal pain. 141 patients (mean age 50 years) had mechanical or degenerative neck pain, of which 13% was probably work-related and 13% was trauma-related. 44 had taken sickness absence for an average of 30 weeks. Comorbidities were frequent (lumbar pain 51%). Those in work were significantly less disabled than those not working (p = 0.001) and those off sick (p < 0.01). Those reporting sleep disturbance, tearfulness and crying were significantly more disabled (p = 0.0001) than those who did not. Neck pain in secondary care is complicated by physical and emotional comorbidities. Comprehensive management requires a biopsychosocial model of care.     

An investigation to determine the association between neck pain and upper limb disability for patients with non-specific neck pain: a secondary analysis

This study investigated the relationship between neck pain and upper limb disability in patients with non-specific neck pain (n = 151) recruited from physiotherapy departments in the United Kingdom. Baseline neck pain/disability was measured using the Northwick Park Neck Pain Questionnaire (NPQ). Baseline upper limb disability was measured using the Disabilities of Arm, Shoulder, Hand questionnaire (DASH). A range of baseline psychosocial variables were measured as potential confounding variables. Pairwise analysis revealed a positive correlation between NPQ score and DASH score (Pearsons’ r = 0.799, p < 0.001). After adjusting for potential confounding variables, stepwise linear regression indicated that increasing upper limb disability was predicted by two baseline variables: higher NPQ scores (B = 0.743) and lower pain self efficacy (PSE) scores (B = −0.489) {R² = 0.713; n = 100, p < 0.001}. This study provides preliminary evidence that patients with severe neck pain/disability also report severe upper limb disability. The relationship between neck pain/disability and upper limb disability was mediated by PSE. Clinically, the presence of severe neck pain or low PSE should direct clinicians towards an assessment of upper limb function. In these cases upper limb disability may need to be addressed as part of the neck management process.     

Correlation among physical impairments, pain, disability, and patient satisfaction in patients with chronic neck pain

OBJECTIVE: To investigate the correlations among pain, physical impairments, disability, and patient satisfaction in patients with chronic neck pain. DESIGN: A longitudinal cohort study with 6-month follow-up. SETTING: Institutional practice. PARTICIPANTS: Subjects (N=218) with chronic neck pain. INTERVENTIONS: Subjects were treated with different physiotherapy modalities. MAIN OUTCOME MEASURES: Data were obtained for self-reported disability, verbal numeric pain scale, patient satisfaction, and 2 measures of physical impairments during the initial visit, at 6 weeks, and finally at 6 months. RESULTS: The correlation among 4 sets of measurements varied. Moderate correlation was noted between disability and patient satisfaction ( r range, .50-.65), and between disability and pain ( r range, .55-.63). A fair relationship was found between pain and patient satisfaction ( r range, .43-.48), but only weak relationships were found between physical impairments and pain ( r range, -.08 to -.25). The correlations tended to increase in the follow-up assessments. CONCLUSIONS: No strong correlations were found among disability, patient satisfaction, pain, and physical impairments although the correlations tended to increase in the follow-up assessments. The findings support the suggestion that clinicians should address as many relevant aspects of a presenting clinical entity as possible in the management of chronic neck pain.     

Effect of muscle energy technique and static stretching on pain and functional disability in patients with mechanical neck pain: A randomized controlled trial

BackgroundMechanical neck pain is one of the common musculoskeletal disorders. Muscle energy technique (MET) may be a useful intervention for treating such disorder.ObjectiveThe aim of this study was to compare the effect of MET with passive stretching on pain and functional disability in people with mechanical neck pain.MethodsA randomized controlled trial was undertaken. Sixty patients with mechanical neck pain were randomly allocated to either the MET group or control group. The former group received MET, and the latter group received static stretching. Both groups received conventional therapy. Treatment was given once a day for 6 days. A visual analogue scale (VAS) was used to measure the intensity of pain, and functional disability was assessed using the neck disability index (NDI) was immediately before treatment and again on the 6^th day.ResultsVAS and NDI scores showed a significant improvement in both MET and stretching groups on the 6^th day postintervention (p < 0.05). However, both VAS and NDI scores showed better improvement in the MET group as compared to the stretching group (p < 0.025).ConclusionMuscle energy technique was better than stretching technique in improving pain and functional disability in people with mechanical neck pain.     

Differences in isometric neck muscle strength between healthy controls and women with chronic neck pain: the use of a reliable measurement

Cagnie B, Cools A, De Loose V, Cambier D, Danneels L. Differences in isometric neck muscle strength between healthy controls and women with chronic neck pain: the use of a reliable measurement.

Objectives

To determine the intra- and interrater reliability of the Biodex isokinetic dynamometer to measure the maximal isometric strength of the cervical flexors and extensors, to develop an age- and sex-based normative database in a healthy population, and to evaluate the differences in neck strength between women with chronic neck pain and healthy controls.

Design

Cross-sectional.

Setting

Physical and rehabilitation medicine department.

Participants

Ninety-six healthy volunteers (4 age groups: 20-29, 30-39, 40-49, 50-59y; each consisting of 12 men and 12 women) and 30 women with chronic neck pain.

Interventions

Not applicable.

Main Outcome Measures

Peak isometric strength of the cervical muscles was tested for flexion and extension by using the Biodex isokinetic dynamometer. The intra- and interrater reliability of the protocol was evaluated in 12 volunteers.

Results

The reliability for strength was high for both flexion and extension (intraclass correlation coefficient, .92-.96). The mean peak torque for flexion and extension was significantly higher in men (24Nm, 36.4Nm, respectively) compared with women (16.6Nm, 26.5Nm, respectively) (P<.001). Peak torque production for extension was significantly lower in the patient group (22.3Nm) compared with the healthy female control group (26.5Nm) (P=.003). No significant differences in flexion strength between patient and female control group were found.

Conclusions

Results show a high degree of intra- and interrater reliability in measuring isometric neck muscle strength when using the Biodex isokinetic dynamometer. The use of normative data for neck strength when evaluating patients with neck disorders needs to take sex into account. The current study has shown that women with chronic neck pain have lower neck muscle strength in extension than the healthy female group.     

中文版Oswestry功能障碍指数评定慢性腰痛患者的反应度研究

目的:探讨中文版Oswestry功能障碍指数(ODI)评定慢性腰痛患者的反应度,为临床应用提供客观依据。方法:87例慢性腰痛患者参与了本研究,患者根据自己情况独立完成ODI、视觉模拟评分法(VAS)和日本骨科学会(JOA)下腰痛评分3个量表。每一种量表评定2次,分别在治疗前和治疗后2周。应用配对t检验比较患者治疗前后的ODI总分和各领域评分;应用效应大小(ES)和标准化反应均数(SRM)来比较3个量表的内部反应度;应用Spearman相关系数来检验ODI总分的变化值与患者自我疗效评估得分的相关性,分析ODI的外部反应度。结果:患者治疗前后的ODI总分和各领域评分比较,两者间差异均有显著性意义(P0.01);ODI的ES=1.63,SRM=1.46;ODI总分的变化值与患者自我疗效评估得分的Spearman相关系数为0.68(P0.01)。结论:中文版ODI评定慢性腰痛患者具有良好的反应度。     

Oswestry功能障碍指数评定慢性腰痛患者的效度分析

目的:探讨中文版Oswestry功能障碍指数(CODI)的效度,为临床应用提供客观依据。方法:107例慢性腰痛患者参加测试,患者根据自己情况独立完成CODI、视觉模拟评分法(VAS)和健康状况调查问卷(SF-36)3个量表。应用因子分析对CODI进行分析来检验其结构效度;应用Person相关分析计算CODI每一条目与所属领域和其他领域的相关系数来检验其内容效度和区分效度;比较CODI和VAS、CODI和SF-36的Person相关系数来检验其同期效度。结果:患者对CODI的条目8回答率较低(32.7%),没有纳入统计分析。CODI的9个条目提取出3个公因子,累计方差贡献率为76.3%;每一条目与所属领域的相关系数r=0.78—0.89(P0.05),且每一条目与所属领域的相关系数均高于该条目与其他领域的相关系数;CODI的三大领域得分和VAS评分的相关系数分别为r=0.88,0.81,0.76(P0.05);CODI的三大领域得分与SF-36各项目分值相关性r=-0.36—-0.87(P0.05)。结论:CODI具有良好的结构效度、内容效度、区分效度和同期效度,可用于慢性腰痛患者的临床评定。     

Movement behaviour in patients with chronic neck pain

Background and Purpose. The present study evaluated whether patients with chronic neck pain demonstrate characteristic angular movement deviations during repeated cervical spine movements. Method. Sixteen patients with chronic neck pain and a group of 18 aged‐matched healthy control subjects performed 10 repetitive maximal cervical movement cycles (flexion/extension, rotation, lateral flexion) at a self‐determined velocity. To collect the kinematic data of the cervical spine, a three‐dimensional ultrasonic movement analysis system (Zebris CMS70^©, Germany) was used. To describe the movement variability in the maximum oscillation amplitudies the intra‐subject coefficients of variation (CV %) was calculated. The maximum difference was characterized by the absolute differences between the minimum and maximum oscillation amplitudes of iterated movement cycles. Pain intensity was obtained by visual analogue scales (VAS). Results. The average pain rating of the patients with chronic neck pain indicated moderate neck pain intensity (3.7 (±0.8)). Independent Student's t‐tests revealed a significantly decreased range of movement (ROM) in the chronic neck pain group for all anatomic values (p < 0.05), except for the lateral flexion to the right. The maximum differences and variability parameters showed significantly increased values in the chronic neck pain group in all directions (p < 0.001). Conclusion. Maximal cervical ROM was significantly lower, and movement variability was significantly higher, in patients compared with healthy control subjects. The differences of cervical motion variability point towards increased movement irregularities in patients with chronic neck pain. The present study shows evidence to support the hypothesis that additional information may be gained from the analysis of movement variability. Copyright © 2007 John Wiley & Sons, Ltd.     

Predictors of disability in migraineurs referred to a tertiary clinic: neck pain, headache characteristics, and coping behaviors

OBJECTIVE: The aim of this retrospective study was to determine if neck pain, select headache characteristics, and migraine-related coping response predicted disability in migraineurs referred to a tertiary headache clinic. METHODS: Patients seeking treatment at a neurology-based headache clinic were included if they met diagnostic criteria for migraine with or without aura according to the International Headache Society (1.1, 1.2). Subjects completed a self-report headache history form and a detailed headache and neurologic examination. The headache history form assessed: 1)weekly headache frequency; 2) number of weekly severe headaches; 3) presence of migraine-related neck pain; 4) photophobia; 5) phonophobia; 6) headache duration; 7) vomiting; 8) monthly headache-free days; and 9) behavioral coping style. Disability was assessed using a self-report inventory (HIT-6). RESULTS: Self-reported headache severity, frequency, and headache-free days were strongly associated with disability. The presence of neck pain during migraine and one's coping response to migraine significantly predicted disability independent of headache characteristics. CONCLUSIONS: These data suggest the need for prospective research exploring the causal mechanisms by which neck pain and coping response influence disability and underscores the importance of multidisciplinary approaches to headache management.     

Quantitative sensory measures distinguish office workers with varying levels of neck pain and disability

This study was undertaken to investigate any relationship between sensory features and neck pain in female office workers using quantitative sensory measures to better understand neck pain in this group. Office workers who used a visual display monitor for more than four hours per day with varying levels of neck pain and disability were eligible for inclusion. There were 85 participants categorized according to their scores on the neck disability index (NDI): 33 with no pain (NDI<8); 38 with mild levels of pain and disability (NDI 9-29); 14 with moderate levels of pain (NDI30). A fourth group of women without neck pain (n=22) who did not work formed the control group. Measures included: thermal pain thresholds over the posterior cervical spine; pressure pain thresholds over the posterior neck, trapezius, levator scapulae and tibialis anterior muscles, and the median nerve trunk; sensitivity to vibrotactile stimulus over areas of the hand innervated by the median, ulnar and radial nerves; sympathetic vasoconstrictor response. All tests were conducted bilaterally. ANCOVA models were used to determine group differences between the means for each sensory measure. Office workers with greater self-reported neck pain demonstrated hyperalgesia to thermal stimuli over the neck, hyperalgesia to pressure stimulation over several sites tested; hypoaesthesia to vibration stimulation but no changes in the sympathetic vasoconstrictor response. There is evidence of multiple peripheral nerve dysfunction with widespread sensitivity most likely due to altered central nociceptive processing initiated and sustained by nociceptive input from the periphery.     

The psychometric properties of the cervical nonorganic signs in patients with neck pain: an assessment of pain expression

Purpose: Neck pain is a common cause of disability. This study investigated the psychometric properties of the cervical nonorganic signs (CNOS), a tool for assessing abnormal illness behaviors in patients with neck pain.

Methods: The CNOS was administered on patients with neck pain. Reliability and validity analyses were used to evaluate the psychometric properties. Exploratory factor analysis was used to investigate the dimensionality. Correlations with the Short Form-36 were used to investigate the convergent validity.

Results: The results supported the reliability (inter-rater reliability intra-class correlation: 0.920), validity (correlated with body pain (|ρ|=0.31) and vitality (|ρ|?=0.30), and two-factor dimensionality (χ²=^?5.904, p=?0.66; χ²/df?=?0.738; RMSEAConclusion: The CNOS is a reliable and valid instrument for assessing pain and vitality problems. It helps patients to express severe pain and lack of vitality. The rehabilitation discipline could use the scale to understand pain expression and to design proper rehabilitation programs.

• Implications for Rehabilitation

• The cervical nonorganic signs has two domains (pain and vitality).

• The scale is reliable and valid for patients with neck pain.

• Patients with high scores on the pain domain have severe body pain that may interfere with normal social activities.

• Clinicians should understand their suffering and try to help them to alleviate the pain.

     

Self-rated disability,fear-avoidance beliefs,nonorganic pain behaviors are important mediators of ranges of active motion in chronic whiplash patients

Abstract

Purpose: The influence of self-rated disability and fear-avoidance beliefs on whiplash sufferers in their performance of active ranges of motion has not been studied well. We undertook a cross-sectional study to determine this. Methods: Chronic whiplash subjects completed a standard clinical examination. They completed the Neck Disability Index (NDI), the Tampa Scale for Kinesiophobia (TSK) and pain visual analog scale (VAS). Active ranges of motion (goniometer) and cervical nonorganic simulation signs (C-NOSS) were obtained by the examiner. Univariate and multivariable analyses were conducted on these scores. Results: Sixty-four subjects (37 female) with a mean age of 41.4 (SD 16.1) years completed all scores. NDI, pain VAS and C-NOSS correlated significantly with ROM. In a multivariable model, only the NDI score contributed significantly to the variance of the ROM scores (14%). Conclusion: As chronic whiplash sufferers perform ROM in a clinical examination, these ranges are importantly influenced by their self-perceived disability. Cervical nonorganic simulation signs can be helpful in distinguishing high from very high levels of disability and motion restriction. The lack of correlation with the TSK may present a challenge to the Fear Avoidance Model in whiplash.

• Implications for Rehabilitation

• Self-ratings of disability in chronic whiplash sufferers are influenced by their fear-avoidance beliefs.

• While self-ratings of disability are known to predict chronicity of whiplash, there is less known about how these ratings affect impairment assessment during recovery.

• This study shows that self-ratings of disability influence the presentation of impairment by chronic whiplash sufferers with respect to their ranges of neck motion.

• Signs of nonorganic behavior also influence ranges of motion and self-ratings of disability.

• These findings should be incorporated into the interpretation of impairment findings in chronic whiplash sufferers in order to improve management.

     

Measuring Functioning in People with Fibromyalgia (FM) Based on the International Classification of Functioning,Disability and Health (ICF)—A Psychometric Analysis

Objectives: Instruments to assess functioning in patients with FM vary considerably in their content and are often symptom‐specific. This study aimed to examine whether it is feasible to construct a psychometric‐sound clinical instrument to measure functioning in FM based on the Brief ICF‐Core‐Set for chronic widespread pain (CWP). Methods: Two hundred and fifty six people with FM completed the Brief ICF‐Core‐Set. The Rasch model was used for analysis. Once ordering of response options of ICF categories was ensured, the following properties were studied: fit of the ICF categories to the Rasch model, the targeting between ICF categories and a person’s abilities, unidimensionality, and reliability. Results: Six ICF categories were rescored due to disordered thresholds. Five ICF categories were removed due to high model‐misfit and differential item functioning (DIF) for gender. Scores from 46 participants were excluded due to extreme scores. The ICF categories included display consistency with an underlying unidimensional construct, are free of DIF for age, disease duration and gender, display excellent overall reliability, and cover a range of functioning difficulties. Conclusions: This study illustrates that it is possible to measure functioning as a unidimensional construct based on selected ICF categories from the components body functions, as well as activities and participation of the Brief ICF‐Core‐Set for CWP in patients with FM.     

Self efficacy as a mediator of the relationship between pain intensity, disability and depression in chronic pain patients

To clarify the relationships between physical, and psychosocial components of chronic pain, a path analytic model was tested conceptualizing self efficacy as a mediator of disability. In turn, disability was hypothesized to mediate depression. This model could help explain the circumstances under which disability develops and why so many chronic pain patients become depressed. Questionnaires from 126 chronic pain patients (without prior depression) were reviewed from three pain clinics. Hypothesized and alternate models were tested using separate regression equations to identified models which best fit these data. Regression analysis supported that self efficacy partially mediates the relationship between pain intensity and disability. This model accounted for 47% of the explained variance in disability (P<0.001). Six additional variables that were significantly related to disability in preliminary analysis, added to the explained variance in disability (R²=0.56), with gender and pain location paths remaining significant. In separate regression analyses, disability was found to partially mediate the relationship between pain intensity and depression (b=0.47–0.33). This model accounted for 26% of the explained variance in depression. The addition of self efficacy to this model supported it as a stronger mediator (R²=0.32), and suggested that support for disability as a mediator of depression was a spurious finding. Both pain intensity and self efficacy contribute to the development of disability and depression in patients with chronic pain. Therefore, the lack of belief in ones own ability to manage pain, cope and function despite persistent pain, is a significant predictor of the extent to which individuals with chronic pain become disabled and/or depressed. Nevertheless, these mediators did not eliminate the strong impact that high pain intensity has on disability and depression. Therefore, therapy should target multiple goals, including: pain reduction, functional improvement and the enhancement of self efficacy beliefs.