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Treatment success in neck pain: The added predictive value of psychosocial variables in addition to clinical variables

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Published/Copyright: January 1, 2017
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In this issue of the Scandinavian Journal of Pain Ruud Groeneweg and co-workers [1] focus on the influence of treatment outcome expectancies on the treatment effect in patients with neck pain. They also included clinical and psychosocial variables previously documented to be associated with treatment outcome. In a prospective study including 181 patients followed at 7 and 26 weeks after receiving manual therapy or physiotherapy, hierarchical logistic regression analysis documented that expectancies explained slightly less than 10% of the variance in pain and 16–17% of the variance in functioning. In contrast to several previous prospective studies in neck pain, fear avoidance beliefs did not influence outcome significantly in the present study [2,3,4,5].

1 Neck pain, fear and expectancies

Neck pain is common, and often associated with substantially reduced function [6,7]. The course of neck pain may be long lasting [8] and closely associated with psychosocial factors [9,10]. Emotional distress, anxiety and depression are classic psychological factors influencing the prognosis of neck pain [11,12]. However, also beliefs and expectancies are assumed to influence the prognosis of painful conditions [5,13]. Fear avoidance beliefs are documented in numerous studies to act as mediator and moderator of pain [3,4,5]. Yet, another dimension of psychology is expectations and credibility, i.e. thoughts and feelings about treatment and outcome. Although, to some extent explored in relation to placebo and nocebo effects, expectations are, as Ruud Groeneweg et al. [1] point out, seldom included together with the more classical psychosocial factors in the spinal pain literature. Hence, expectancies outweighing fear avoidance beliefs in the present study is an important finding and needs to be pursued in future studies as well.

2 Challenges in expectation research

There are yet several challenges to be resolved within this area of research. One may assume that expectations are individual and heterogeneous. Hence, expectations are likely to be related to a particular population. Socioeconomic background [14], previous health experiences [15], personality and emotional distress [16] may affect expectations. Furthermore, the expectations may be related to the particular complaint or diagnosis, to the subsequent treatment [17] or to the prognosis and outcome [18]. In the present study by Groeneweg et al. [1], the patients consented to participate in a randomized treatment trial which may be an explanation for their high level of expectations. In contrast, Skatteboe et al. [19] found that among a mixed population referred to a specialized outpatient clinic, only one third of the patients expected changes in their condition. In addition, even though the pain level was rather high and two thirds of the patients had multiple pain sites, their disability as evaluated by Neck Disability Index was relatively low in the present study compared to other studies [20,21]. In addition, the way we measure credibility and expectation may influence the results. Using a properly translated and validated instrument like the Credibility Expectancy Questionnaire (CEQ) is a strength in the present study. However the questions in CEQ are closely related to the treatment. Several other measurements exist [22], which may capture different dimensions of expectancies and influence the diverging results. However, the systematic review by Mondloch et al. [13], supports the results by Groeneweg et al. [1], and documents that positive treatment expectations were associated with improved health outcomes in 15 of 16 studies.

3 Clinical utility of expectations

The article by Groeneweg et al. [1], supports the need of better assessment of patients expectations in the clinical setting. However, it is worth to note that unrealistic expectations, whether high or low, are suggested to negatively influence outcomes [23]. Hence, moving to clinical utilizations of expectations, we may need to adjust the expectations to the documented effect of the treatment and prognosis. Health care professionals seem to have the possibility to do so [24] and such adjustments have in itself been shown to improve outcome [25]. In conclusion, the assessment and discussion of expectations in the clinical consultations is a cheap and viable direction to improve communication and care of patients with painful musculoskeletal conditions.


DOI of refers to article: http://dx.doi.org/10.1016/j.sjpain.2016.10.003.



Oslo University Hospital, Department of Physical Medicine and Rehabilitation, Pbox 4950, Nydalen, 0424 Oslo, Norway.

  1. Conflict of interest: None declared.

References

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Published Online: 2017-01-01
Published in Print: 2017-01-01

© 2016 Scandinavian Association for the Study of Pain

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