1 Background
Wilbert (Bill) Fordyce was a pioneer in the field of the treatment for chronic pain. He was the first to conceptualize and use behavioral theory as a basis for a treatment program for chronic pain and other symptoms. This idea and how to conceptualize it in a practical manner were published in 1976 in a landmark book “Behavioral Methods in Chronic Pain and Illness” which has recently been re-issued by the International Association for the Study of Pain Press with comments for each chapter by leading psychologists and physicians in the field of pain research and treatment, many of whom worked with or otherwise knew Bill. The treatment that he established with an inter-disciplinary team at the University of Washington in the 70s–90s became the model for the world [1, 2].
Much of what I learned from Bill Fordyce that struck a positive chord was his presentation of his ideas expressed as aphorisms which were a compendium of simple rules about pain, pain behavior and pain treatment. They are very useful in describing patients and the chronic pain state. They come to mind repeatedly when I encounter difficult patients and the aphorisms help to explain to patients and therapists why some treatments they might think inappropriate can actually help significantly.
2 “Those with something better to do, don’t hurt so much.”
Demographic data show that there is a strong association between empty lives and chronic pain. The landmark articles of Eriksen [3] analyzing information from the Danish Health Registry showed that females with low education, poor economy, living alone were highly represented in the group endorsing chronic pain. Since, there has been much data to support these observations. One could argue that this is a chicken and egg situation that has not yet been fully explained. Is it the chronic pain that has changed their lives or is it their lives that have made them more susceptible to disability and more suffering? Looking at professional athletes in contact sports exemplifies Bill’s idea from a positive position. These high paid athletes generally continue playing with acute and chronic pain conditions that would make many of us stop most activity including work. Think of taking a “hit” from a football or ice hockey player when standing at a bus stop. How would you react? The athletes ignore these painful experiences and continue with the game. The influence of chronic pain is therefore greater when there are fewer distractions in one’s life i.e. an interesting job, children, social and home responsibilities. This is how the nervous system works. The descending inhibition to the spinal cord is much stronger with greater input at all levels and those with empty lives do not have a high level of descending inhibition driven by a focus on a more interesting or demanding environment. See Section 12: “One violin plays and that patient hears the whole string section”.
3 “It’s only pain.”
This is the basis for Acceptance and Commitment Therapy (ACT) [4] and Bill was using this long before ACT was proposed and became a popular treatment. Bill would say this to patients, usually when they had begun a pain rehabilitation program or after completing it when they complained that they still had pain. The program had discussed chronic pain as an aberration in the sensory system that was not the same as the protective process in acute pain. All possible avenues of treatment for the “bio” aspect of the problem had been tried without success before the patients began pain rehabilitation. Tuning out pain was possible if the meaning and importance were put into perspective. Activity was one way of activating the pain inhibition system to decrease the conscious experience of pain. See also Section 4: “Hurt and harm are not synonyms”. The response to “It’s only pain” was variable – shock, sometimes anger but often the patients would suddenly recognize how true it was. The background pain signals were only noise and they could continue with their lives as the background noise varied but it didn’t necessarily affect their daily activities very much, especially when those activities were a part of a quota driven system in the pain rehabilitation program [1].
4 “Hurt and harm are not synonyms.”
Or, to state it differently, “hurt does not equal harm” as Bill would also paraphrase it. In the behaviorally based pain rehabilitation program, patients were taught the difference between pain as a warning signal as in acute injury and the changes that can occur after injury (or appear spontaneously) in the somatosensory system to produce chronic pain that is not a signal for “impending or actual tissue damage” (IASP pain definition [5]). The interpretation that chronic pain is a warning signal creates concern for patients and inhibits their activities through fear that they are actually aggravating some ongoing injury to a vital part of their body. This is explained in part by the changes in connectivity of the Default Mode Network where the mind in neutral changes to focus on the pain matrix instead of other areas [6]. Many patients we encountered with low back or neck pain expressed the idea that too much activity/too much pain would lead to their being paralyzed with permanent damage to their spinal cords! Typical catastrophizing [7]. Unfortunately, this idea had been reinforced by previous professional contacts they had because of their pain. Too many patients are told “If it hurts, don’t do it!” See Section 18: “Superstitious over-guarding”.
5 “All chronic pain has a behavioral component.”
Bill Fordyce was the first to use behavioral methods to treat pain and illness behavior in patients with chronic pain [1]. Based on the theories and research of Skinner [8], we are all influenced by our immediate environment and there are positive and negative reinforcers in the environment that shape our behavior, including the response to pain. Think of young children and their reaction after falling in the playground. If their parents seem concerned and solicitous, there is a lot of crying and pain behavior. If their parents just smile, blow on or kiss the hand or knee that was hurt and say everything is fine, the children also smile and go on playing. The parents’ responses can be the positive or negative reinforcers that shape the children’s behavior in response to a minor injury. We respond to pain signals based on past experience and learning. Often, this process is counterproductive and misinterpreting the signals can lead to unnecessary disability.
6 “The complaint of pain is merely social commentary the meaning of which is yet to be determined.”
“I hurt” is pain behavior and is not a good indication in chronic pain of what is actually happening in the body. It is, however, a signal that the individual is suffering. We have a lot of information from animal research on various pain states, almost all acute pain models, explaining neural and biochemical reactions in the somatosensory system in response to various injuries or pain stimuli but applying this information to the human condition in chronic pain is difficult. NRS or VAS scores are also pain behavior and are a better indication of suffering than of nociception [9]. Therefore, when a person says “I hurt”, we need to be careful how we interpret the statement and in the case of chronic pain, it is often very difficult to identify a significant pathological explanation.
7 “Pain is transdermal. It depends on events inside and outside the body.”
Bill started saying this shortly after transdermal fentanyl patches came on the market. It is similar to his statement that “All pain has a behavioral component”.The pain experience results from the interpretation of signals from the somatosensory system based on past experience and what is going on in the person’s immediate environment. Modulation of the incoming information at a spinal level can either increase or decrease the signal. This modulation also occurs at various central nervous system sites up to and including the cerebral cortex [10]. Again, think of the difference between being knocked down during a football match as a player and having the same contact and falling while walking on the street.
8 “Young men have too many hormones to have chronic pain.”
Bill’s meaning was that young men are programmed to be active, to be forming relationships, establishing a career, using their bodies. One can speculate that this is in the male genes which have evolved in a highly specialized way in hunter/gatherer societies. Testosterone may be protective against pain [11]. Looking a bit more closely and taking Bill’s aphorism literally, there is a significant literature around testosterone and pain and the fact that high testosterone levels influence top down control over nociceptive input at the spinal level [12]. From the opiate/pain literature, there is also data to show there is an association between low testosterone levels and pain, depression and anxiety, all improved by administration of testosterone [13].
9 “Patients will present with the symptoms to satisfy any new diagnosis that doctors come up with.”
The medical system needs diagnoses and these are often the basis for a specific treatment. Medical training has made not finding a diagnosis an indication of failure on the doctor’s (physiotherapist’s, occupational therapist’s, nurse’s, etc.) part. Therefore, new diagnoses for various pain problems come regularly but often these are discarded or are modified or fall into disuse. Examples are “railway spine” in 19th century England [14], repetitive strain syndrome as a major cause of work loss in Australia in the 1980s and then in England in the 1990s [15]. Since patients also want a biological diagnosis to explain their symptoms, they are quick to attach themselves to new ideas that can validate their suffering. The internet makes sure that this will continue, possibly with both positive and negative effects. Thinking about this aphorism strengthens the admonition to “treat the patient, not the diagnosis”.
10 “Use it or lose it.”
This obviously is not a Bill Fordyce original but he used this with almost all the patients coming into the pain rehabilitation program. Bill took his clues from first Bortz [16] and then later, Corcoran [17]. Trying to explain succinctly the behavioral aspects was not an idea that was easily accepted by some patients but using this training motto to explain why the exercise program was important was very successful. This principle is based on the longstanding evidence that not using any function of the body or mind will lead to a decrease in that function. The body is economical and will reduce resources in areas where they are not needed. This is not only true of musculoskeletal function but also cardiovascular, respiratory, memory, vision, hearing, sexual function and many others. See Section 11: “You are more disabled than the medical evidence would suggest.”
11 “You are more disabled than the medical evidence would suggest.”
Bill used this with patients during the team feedback with them and a family member. Coming with a family member, also interviewed by psychology was routinely a part of the multidisciplinary evaluation. Feedback was given by the team and the medical (bio) aspects were covered first. Along with “Use it or lose it” [16], “You are more disabled than the medical evidence would suggest” was a simple explanation that the pain rehabilitation program was designed to treat the disability that had occurred in most of the patients while they waited for “healing” after surgery or an injury or for appropriate medical treatment for their chronic pain. It was often difficult for the patient to grasp until they had been in the rehabilitation program for a time but their “significant other” often understood directly. The family member had witnessed the physical (and sometimes mental) decline that had occurred along with the chronic pain and often found it alarming. Patients often believed that just removing the pain would allow them to return to full activity despite the deconditioning secondary to them being stuck in a “find it and fix it” mentality.
12 “One violin plays and that patient hears the whole string section.”
This is an excellent description of the effects of central sensitization [18]. There are many other terms for this process in the literature including “symptom preoccupation”, “symptom amplification”. It is as if the gain in the sensory system has been increased if we think of the pain system as similar to an audio system. It supports the idea that descending inhibition is not functioning well. We do have information from studies in various chronic pain states that conditioned pain modulation (CPM), previously known as diffuse noxious inhibitory controls (DNIC) is weak or absent. This can explain a part of the “symptom preoccupation”. Sensory input at the spinal level and above is not modulated in a normal manner and this results in more attention to these aberrant sensations. Also, data on the research into the function of the Default Mode Network centrally helps to explain this [6].
13 “That patient listens to their body too much.”
Many pain patients are so concerned about pain as a warning signal that they focus abnormally on any symptoms that might indicate worsening or are proof of cancer or something equally dangerous that might be causing the pain. See also Section 12: “One violin plays and that patient hears the whole string section.”
14 “If you want to make a silk purse from a sow’s ear, you need to start with a silk sow.”
There is an English aphorism that says “You can’t make a silk purse out of a sow’s ear!“ This implies that if you want to improve a situation, a state or condition, there has to be some possibility or potential for improvement. Bill wasn’t as pessimistic about the possibilities of helping difficult patients as some. If he saw a glimmer of hope (a silk sow) then he was willing to try. One point Bill made using this idea was that patients, after the multidisciplinary evaluation, needed to have realistic goals for what they would do if they had less pain. They must also be willing to try a different non-“bio” approach to their problems. The corollary of this aphorism is that you can’t help everybody and you need to choose those patients for treatment that best match your capabilities. You will be overwhelmed if you try to help everybody.
15 “Information is to behavior change as spaghetti is to bricks.”
When Bill would say this to those involved with chronic pain treatment, everyone would look confused. His point was that spaghetti and bricks are very dissimilar. Trying to judge behavior change by asking the patient how they are doing can be misleading. If you ask patients if they are exercising more or taking fewer tablets they usually will say “yes” since they know that this is the answer you want to hear. In the pain rehabilitation program we, Bill included, routinely went to the gym to watch the patients exercise. They were also observed by the therapists, directly under supervision or indirectly. At daily rounds, all the staff would report on the patients’ activities so we had good information about behavior change. The patients were also required to graph their activities and thus they and we had a visual proof of positive change. The therapists and the other patients were quick to note if these graphs were accurate or not. For most patients in the rehabilitation program, the reporting was accurate but human nature being what it is, some would try to look better than their actual performance. If not observed, the discrepancies could very well be much larger.
16 “That patient goes around holding their umbilical cord looking for a kind doctor to plug it in to.”
This is a perfect description of the needy patient that feels they must have constant contact with a therapist for their emotional (and often social) support [19]. They have “learned helplessness” and are very dependent [20]. The contact they crave can be with anyone in the pain team but those patients will take up as much time as possible when they have found a sympathetic therapist. They can never be better since that would mean losing their support system. One must be careful with these patients since they demand so much time and often don’t improve significantly – one step forward, one step back is the rule. Limited, scheduled contact is necessary and a weaning process is needed so that they don’t spend their lives with their umbilical cord attached to the pain clinic. If progress halts it is time to say “Sorry but I can’t help you any more”. This usually leads to progress in the right environment so that the patient can maintain contact with the support system and this desire can be used to advantage. As Bill would say, positive reinforcement if they improve, negative reinforcement i.e. less contact or no contact if they don’t improve, can shape this behavior in a way to make the umbilical cord contact unnecessary.
17 “That man needs to go back and be born to different parents.”
Bill would often say this about a patient he hadn’t seen. He insisted that all patients for a multidisciplinary evaluation complete the Minnesota Multiphasic Personality Inventory (MMPI) questionnaire that was originally designed to detect psychopathology. Processing the questionnaire resulted in a graph [21]. Bill had been trained in his PhD studies on the MMPI and was an expert at interpretation. He would hold up the graph and usually have an accurate description of the patient’s psychological makeup without seeing them. In this case, it often meant someone with lasting psychopathology related to their upbringing. It was usually a warning about maladaptive psychosocial mechanisms that had a strong influence on their chronic pain. It was not a deterrent to treatment, however, just a caution [22].
18 “That patient displays superstitious over-guarding.”
This was Bill’s description of “fear avoidance”, “fear of movement”, “kinesiophobia” [23]. He identified this as a major problem for many patients and devised a scheme for extinguishing it. One was his “speed walk”. Many pain patients have strange walking gaits that are supposedly pain relieving but may actually cause new problems because of faulty body mechanics. Why should someone with neck pain need a cane and walk strangely? Bill reasoned that if you try to walk fast, it is impossible to limp. The speed walk was how to change unusual walking habits. Patients began at whatever speed level they could manage but the goal was to cover 50 m in 25 s by the end of the treatment program. Most of the patients loved this exercise and it became a competition which encouraged better participation. It resulted in spectators (the other patients) cheering on each speed walker. This effectively extinguished strange walking patterns. Johan Vlaeyen was a student with Bill for six months and then developed the fear-avoidance model from that experience using Bill’s “superstitious over-guarding” as the basis for his theory and later extensive research that is still ongoing [24].
19 “A person cannot manifest two incompatible behaviors at the same time”
That is the basis for the “speed walk” as above. Fast walking and limping can’t be done at the same time. This can be applied to other forms of exercise as well to extinguish strange motor behaviors that are part of pain behavior but have no real pain relieving value. Proper sitting, standing use of tools, etc. can be modified and changed by practicing normal body mechanics and this usually leads to decreased pain and increased productivity.
20 “All pain patients have learned the metric system”
When patients came to the pain rehabilitation program we needed a starting point for setting up quotas for their physical activities. They were instructed in the core activities and told to exercise “until pain, weakness or fatigue make you want to stop”. If the activity involved counting repetitions, they invariably stopped with the number of repetitions ending in a 5 or a 0. It was obvious that this was not maximal effort and made us sure that by starting their quota at 75% of their baseline efforts we were not beginning at too high a level for their capabilities.
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Conflict of interest: None declared.
Acknowledgments
Many thanks to John Loeser, Judy Turner, Joan Romano and Mark Jensen for helpful comments and also for contributing to my education about chronic pain and its treatment.
References
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© 2017 Scandinavian Association for the Study of Pain
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- Scandinavian Journal of Pain
- Editorial comment
- Glucocorticoids – Efficient analgesics against postherpetic neuralgia?
- Original experimental
- Effect of intrathecal glucocorticoids on the central glucocorticoid receptor in a rat nerve ligation model
- Editorial comment
- Important new insight in pain and pain treatment induced changes in functional connectivity between the Pain Matrix and the Salience, Central Executive, and Sensorimotor networks
- Original experimental
- Salience, central executive, and sensorimotor network functional connectivity alterations in failed back surgery syndrome
- Editorial comment
- Education and support strategies improve assessment and management of pain by nurses
- Clinical pain research
- Using education and support strategies to improve the way nurses assess regular and transient pain – A quality improvement study of three hospitals
- Editorial comment
- The interference of pain with task performance: Increasing ecological validity in research
- Original experimental
- The disruptive effects of pain on multitasking in a virtual errands task
- Editorial comment
- Analyzing transition from acute back pain to chronic pain with linear mixed models reveals a continuous chronification of acute back pain
- Observational study
- From acute to chronic back pain: Using linear mixed models to explore changes in pain intensity, disability, and depression
- Editorial comment
- NSAIDs relieve osteoarthritis (OA) pain, but cardiovascular safety in question even for diclofenac, ibuprofen, naproxen, and celecoxib: what are the alternatives?
- Clinical pain research
- Efficacy and safety of diclofenac in osteoarthritis: Results of a network meta-analysis of unpublished legacy studies
- Editorial comment
- Editorial comment on Nina Kreddig’s and Monika Hasenbring’s study on pain anxiety and fear of (re) injury in patients with chronic back pain: Sex as a moderator
- Clinical pain research
- Pain anxiety and fear of (re) injury in patients with chronic back pain: Sex as a moderator
- Editorial comment
- Intraoral QST – Mission impossible or not?
- Clinical pain research
- Multifactorial assessment of measurement errors affecting intraoral quantitative sensory testing reliability
- Editorial comment
- Objective measurement of subjective pain-experience: Real nociceptive stimuli versus pain expectation
- Clinical pain research
- Cerebral oxygenation for pain monitoring in adults is ineffective: A sequence-randomized, sham controlled study in volunteers
- Editorial comment
- Association between adolescent and parental use of analgesics
- Observational study
- The association between adolescent and parental use of non-prescription analgesics for headache and other somatic pain – A cross-sectional study
- Editorial comment
- Cancer-pain intractable to high-doses systemic opioids can be relieved by intraspinal local anaesthetic plus an opioid and an alfa2-adrenoceptor agonist
- Clinical pain research
- Spinal analgesia for severe cancer pain: A retrospective analysis of 60 patients
- Editorial comment
- Specific symptoms and signs of unstable back segments and curative surgery?
- Clinical pain research
- Symptoms and signs possibly indicating segmental, discogenic pain. A fusion study with 18 years of follow-up
- Editorial comment
- Local anaesthesia methods for analgesia after total hip replacement: Problems of anatomy, methodology and interpretation?
- Clinical pain research
- Local infiltration analgesia or femoral nerve block for postoperative pain management in patients undergoing total hip arthroplasty. A randomized, double-blind study
- Editorial
- Scientific presentations at the 2017 annual meeting of the Scandinavian Association for the Study of Pain (SASP)
- Abstracts
- Correlation between quality of pain and depression: A post-operative assessment of pain after caesarian section among women in Ghana
- Abstracts
- Dynamic and static mechanical pain sensitivity is associated in women with migraine
- Abstracts
- The number of active trigger points is associated with sensory and emotional aspects of health-related quality of life in tension type headache
- Abstracts
- Chronic neuropathic pain following oxaliplatin and docetaxel: A 5-year follow-up questionnaire study
- Abstracts
- Expression of α1 adrenergic receptor subtypes by afferent fibers that innervate rat masseter muscle
- Abstracts
- Buprenorphine alleviation of pain does not compromise the rat monoarthritic pain model
- Abstracts
- Association between pain, disability, widespread pressure pain hypersensitivity and trigger points in subjects with neck pain
- Abstracts
- Association between widespread pressure pain hypersensitivity, health history, and trigger points in subjects with neck pain
- Abstracts
- Neuromas in patients with peripheral nerve injury and amputation - An ongoing study
- Abstracts
- The link between chronic musculoskeletal pain and sperm quality in overweight orthopedic patients
- Abstracts
- Several days of muscle hyperalgesia facilitates cortical somatosensory excitability
- Abstracts
- Social stress, epigenetic changes and pain
- Abstracts
- Characterization of released exosomes from satellite glial cells under normal and inflammatory conditions
- Abstracts
- Cell-based platform for studying trigeminal satellite glial cells under normal and inflammatory conditions
- Abstracts
- Tramadol in postoperative pain – 1 mg/ml IV gave no pain reduction but more side effects in third molar surgery
- Abstracts
- Tempo-spatial discrimination to non-noxious stimuli is better than for noxious stimuli
- Abstracts
- The encoding of the thermal grill illusion in the human spinal cord
- Abstracts
- Effect of cocoa on endorphin levels and craniofacial muscle sensitivity in healthy individuals
- Abstracts
- The impact of naloxegol treatment on gastrointestinal transit and colonic volume
- Abstracts
- Preoperative downregulation of long-noncoding RNA Meg3 in serum of patients with chronic postoperative pain after total knee replacement
- Abstracts
- Painful diabetic polyneuropathy and quality of life in Danish type 2 diabetic patients
- Abstracts
- “What about me?”: A qualitative explorative study on perspectives of spouses living with complex chronic pain patients
- Abstracts
- Increased postural stiffness in patients with knee osteoarthritis who are highly sensitized
- Abstracts
- Efficacy of dry needling on latent myofascial trigger points in male subjects with neck/shoulders musculoskeletal pain. A case series
- Abstracts
- Identification of pre-operative of risk factors associated with persistent post-operative pain by self-reporting tools in lower limb amputee patients – A feasibility study
- Abstracts
- Renal function estimations and dose recommendations for Gabapentin, Ibuprofen and Morphine in acute hip fracture patients
- Abstracts
- Evaluating the ability of non-rectangular electrical pulse forms to preferentially activate nociceptive fibers by comparing perception thresholds
- Abstracts
- Detection of systemic inflammation in severely impaired chronic pain patients, and effects of a CBT-ACT-based multi-modal pain rehabilitation program
- Abstracts
- Fixed or adapted conditioning intensity for repeated conditioned pain modulation
- Abstracts
- Combined treatment (Norspan, Gabapentin and Oxynorm) was found superior in pain management after total knee arthroplasty
- Abstracts
- Effects of conditioned pain modulation on the withdrawal pattern to nociceptive stimulation in humans – Preliminary results
- Abstracts
- Application of miR-223 onto the dorsal nerve roots in rats induces hypoexcitability in the pain pathways
- Abstracts
- Acute muscle pain alters corticomotor output of the affected muscle stronger than a synergistic, ipsilateral muscle
- Abstracts
- The subjective sensation induced by various thermal pulse stimulation in healthy volunteers
- Abstracts
- Assessing Offset Analgesia through electrical stimulations in healthy volunteers
- Abstracts
- Metastatic lung cancer in patient with non-malignant neck pain: A case report
- Abstracts
- The size of pain referral patterns from a tonic painful mechanical stimulus is increased in women
- Abstracts
- Oxycodone and macrogol 3350 treatment reduces anal sphincter relaxation compared to combined oxycodone and naloxone tablets
- Abstracts
- The effect of UVB-induced skin inflammation on histaminergic and non-histaminergic evoked itch and pain
- Abstracts
- Topical allyl-isothiocyanate (mustard oil) as a TRPA1-dependent human surrogate model of pain, hyperalgesia, and neurogenic inflammation – A dose response study
- Abstracts
- Dissatisfaction and persistent post-operative pain following total knee replacement – A 5 year follow-up of all patients from a whole region
- Abstracts
- Paradoxical differences in pain ratings of the same stimulus intensity
- Abstracts
- Pain assessment and post-operative pain management in orthopedic patients
- Abstracts
- Combined electric and pressure cuff pain stimuli for assessing conditioning pain modulation (CPM)
- Abstracts
- The effect of facilitated temporal summation of pain, widespread pressure hyperalgesia and pain intensity in patients with knee osteoarthritis on the responds to Non-Steroidal Anti-Inflammatory Drugs – A preliminary analysis
- Abstracts
- How to obtain the biopsychosocial record in multidisciplinary pain clinic? An action research study
- Abstracts
- Experimental neck muscle pain increase pressure pain threshold over cervical facet joints
- Abstracts
- Are we using Placebo effects in specialized Palliative Care?
- Abstracts
- Prevalence and pattern of helmet-induced headache among Danish military personnel
- Abstracts
- Aquaporin 4 expression on trigeminal satellite glial cells under normal and inflammatory conditions
- Abstracts
- Preoperative synovitis in knee osteoarthritis is predictive for pain 1 year after total knee arthroplasty
- Abstracts
- Biomarkers alterations in trapezius muscle after an acute tissue trauma: A human microdialysis study
- Abstracts
- PainData: A clinical pain registry in Denmark
- Abstracts
- A novel method for investigating the importance of visual feedback on somatosensation and bodily-self perception
- Abstracts
- Drugs that can cause respiratory depression with concomitant use of opioids
- Abstracts
- The potential use of a serious game to help patients learn about post-operative pain management – An evaluation study
- Abstracts
- Modelling activity-dependent changes of velocity in C-fibers
- Abstracts
- Choice of rat strain in pre-clinical pain-research – Does it make a difference for translation from animal model to human condition?
- Abstracts
- Omics as a potential tool to identify biomarkers and to clarify the mechanism of chronic pain development
- Abstracts
- Evaluation of the benefits from the introduction meeting for patients with chronic non-malignant pain and their relatives in interdisciplinary pain center
- Observational study
- The changing face of acute pain services
- Observational study
- Chronic pain in multiple sclerosis: A10-year longitudinal study
- Clinical pain research
- Functional disability and depression symptoms in a paediatric persistent pain sample
- Observational study
- Pain provocation following sagittal plane repeated movements in people with chronic low back pain: Associations with pain sensitivity and psychological profiles
- Observational study
- A longitudinal exploration of pain tolerance and participation in contact sports
- Original experimental
- Taking a break in response to pain. An experimental investigation of the effects of interruptions by pain on subsequent activity resumption
- Clinical pain research
- Sex moderates the effects of positive and negative affect on clinical pain in patients with knee osteoarthritis
- Original experimental
- The effects of a brief educational intervention on medical students’ knowledge, attitudes and beliefs towards low back pain
- Observational study
- The association between pain characteristics, pain catastrophizing and health care use – Baseline results from the SWEPAIN cohort
- Topical review
- Couples coping with chronic pain: How do intercouple interactions relate to pain coping?
- Narrative review
- The wit and wisdom of Wilbert (Bill) Fordyce (1923 - 2009)
- Letter to the Editor
- Unjustified extrapolation
- Letter to the Editor
- Response to: “Letter to the Editor entitled: Unjustified extrapolation” [by authors: Supp G., Rosedale R., Werneke M.]