Epidural steroids for lumbosacral radicular syndrome compared to usual care: quality of life and cost utility in general practice.

OBJECTIVE: To investigate the effect of adding segmental epidural steroid injections (SESIs) to usual care compared with usual care alone on quality of life and cost utility in lumbosacral radicular syndrome (LRS) in general practice. DESIGN: A pragmatic randomized controlled trial. Results were analyzed using mixed models. SETTING: Primary care. PARTICIPANTS: Patients (N=50) in the acute phase of LRS. INTERVENTIONS: One epidural injection containing 80mg of triamcinolone in normal saline. MAIN OUTCOME MEASURE: Back pain at 4 weeks after the start of the treatment. RESULTS: Both groups experienced a significant increase in quality of life in (especially) the physical domains of the Medical Outcomes Study 36-Item Short-Form Health Survey. The intervention group scored significantly better than the control group at certain time points in the physical domain. The differences were small. The cost-utility analysis showed that with a negligible loss of utility (3d in perfect health), societal costs (193,354 euros per quality-adjusted life year lost) would be saved because of more productivity in the intervention group. CONCLUSIONS: Although the beneficial effects of SESIs are small and the natural course of LRS is predominantly favorable, we think decision makers can consider implementing SESIs in daily practice with the purpose of saving resources. Caution must be taken, and further research should be directed at identifying patient subgroups who might benefit from SESIs, with additional focus on (costs of) complications and adverse effects.

Radiating low back pain in general practice: incidence, prevalence, diagnosis, and long-term clinical course of illness.

OBJECTIVE: The aim of this study was to calculate the incidence and prevalence of radiating low back pain, to explore the long-term clinical course of radiating low back pain including the influence of radiculopathy (in a subsample of the study population) and non-radiating low back pain thereon, and to describe general practitioners' (GPs') treatment strategies for radiating low back pain. DESIGN: A historic prospective cohort study. SETTING: Dutch general practice. SUBJECTS: Patients over 18 years of age with a first episode of radiating low back pain, registered by the ICPC code L86. MAIN OUTCOME MEASURES: Incidence and prevalence, clinical course of illness, initial diagnoses established by the GPs, and treatment strategies. RESULTS: Mean incidence was 9.4 and mean prevalence was 17.2 per 1000 person years. In total, 390 patients had 1193 contacts with their GPs; 50% had only one contact with their GP. Consultation rates were higher in patients with a history of non-radiating low back pain and in patients with a diagnosis of radiculopathy in the first five years. In this study's subsample of 103 patients, L86 episodes represented radiculopathy in 50% of cases. Medication was prescribed to 64% of patients, mostly NSAIDs. Some 53% of patients were referred, mainly to physiotherapists and neurologists; 9% of patients underwent surgery. CONCLUSION: Watchful waiting seems to be sufficient general practice care in most cases of radiating low back pain. Further research should be focused on clarifying the relationship between radicular radiating low back pain, non-radicular radiating low back pain, and non-radiating low back pain.

Do analgesics improve functioning in patients with chronic low back pain? An explorative triple-blinded RCT.

PURPOSE: TREATMENT of patients with chronic low back pain (CLBP) aims to reduce disability, improve functional capacity, and participation. Time contingent prescription of analgesics is a treatment modality in CLBP. The impact of analgesics on functional capacity is unknown. Aim of the study was to explore the effect of analgesics on functioning measured by functional capacity evaluation, and self-reported disability in patients with CLBP. METHODS: Explorative Randomized Placebo-Controlled Clinical Trial was performed in an outpatient pain rehabilitation setting on patients waiting for rehabilitation. Included patients had low back pain lasting >3 months, visual analogue scale worst pain ≥4.0 cm, and age >18 years. Outcome measures before (T0) and after treatment (T1): functional capacity, pain intensity, Roland Morris Disability Questionnaire. T1: global perceived pain relief. Patient characteristics and psychological questionnaires were assessed. Fifty patients were included in this study and were randomly assigned to 2 weeks treatment or placebo. TREATMENT: acetaminophen/tramadol 325 mg/37.5 mg per capsule. Dose: maximum acetaminophen 1,950 mg and tramadol 225 mg per day; treatment and placebo titrated identically. Compliance and side-effects were monitored. TREATMENT effects between groups over time were compared. RESULTS: One patient (treatment group) was lost to follow-up. Forty-nine patients remained in the study. TREATMENT effects in primary outcomes did not differ significantly between groups. A subgroup of 10 (42%) patients (treatment group) reported global pain relief (responders) who reduced self-reported disability (p < 0.05). Responders had significantly lower catastrophizing scores. CONCLUSION: Overall treatment effects were small and non-significant. A subgroup, however, reported improved functioning as a result of treatment. Responders had lower catastrophizing scores.

Steroid injections added to the usual treatment of lumbar radicular syndrome: a pragmatic randomized controlled trial in general practice.

BACKGROUND: Lumbosacral radicular syndrome (LRS) is a self-limiting, benign, painful and impairing condition caused by lumbar disc herniation and inflammatory processes around the nerve root. Segmental epidural steroid injections (SESIs) are helpful to reduce radicular pain on a short-term basis. It is unknown whether SESIs are an effective addition to usual pain treatment of LRS in general practice. In our study, we assessed the effectiveness of SESIs on pain and disability as an addition to usual care for acute LRS in general practice. METHODS: A pragmatic, single-blinded, randomized controlled trial in Dutch general practice was conducted. Circumstances of daily practice were closely followed. Care as usual (CAU) was compared to care as usual combined with an additional SESI in 63 patients in the acute phase of LRS. To detect a minimal clinically important difference of 1.2 points on a numerical rating scale for back pain and a common within-group standard deviation of 1.7 with a two-tailed alpha of 0.05 and a power of 0.80, we needed 33 subjects in each group. Statistical analysis was carried out using mixed models. RESULTS: A small significant effect in favour of the intervention, corrected for age, sex and baseline values, was found for back pain, impairment and Roland-Morris disability score. The differences, though statistically significant, were too small to be considered clinically relevant. Patients from the intervention group were significantly more satisfied with the received treatment than patients from the control group. CONCLUSION: We found a small, statistically significant, but not clinically relevant positive effect of SESIs on back pain, impairment and disability in acute LRS. We do not recommend implementing SESIs as an additional regular treatment option in general practice.

Heart rate variability parameters do not correlate with pain intensity in healthy volunteers.

OBJECTIVE: When patients cannot indicate pain, physiological parameters may be useful. We tested whether heart rate variability (HRV) parameters, as reflection of sympathetic and vagal tone, can be used to quantify pain intensity. DESIGN: Prospective study. SUBJECTS AND SETTING: A standardized heat stimulus was applied to the forearm in 75 healthy volunteers during three study periods of 2 minutes. METHODS: Before and after each application, pain intensity was measured by a visual analog scale (VAS) and inter beat interval (IBI) was recorded. Standard deviation of normal to normal beat intervals (SDNN) of the IBI, the power of the low (LF, 0.07-0.14 Hz) and high frequency (HF, 0.15-0.50 Hz) band, and LF/HF ratio were calculated. Log transformation resulted in normal distribution. Correlation between HRV parameters and pain intensity was assessed by Pearson's correlation coefficient. RESULTS: Data from 73 volunteers (44 women) could be analyzed. The mean age was 30 ± 11 years. Compared with baseline, during all heat periods, pain intensity measured by VAS increased from 2 ± 3 mm, 3 ± 5 mm, and 2 ± 4 mm, to 40 ± 20 mm, 42 ± 21 mm, and 44 ± 22 mm, respectively. Log transformed SDNN (lnSDNN) and LF (lnLF) decreased; lnSDNN from 4.0 ± 0.4 to 3.9 ± 0.5, P = 0.002; 4.0 ± 0.4 to 3.9 ± 0.5, P = 0.016; and 4.1 ± 0.4 to 3.9 ± 0.4, P = 0.004, respectively; lnLF from 6.3 ± 1.0 to 6.1 ± 1.2, P = 0.001; 6.4 ± 1.0 to 6.2 ± 1.1, P = 0.019; and 6.5 ± 1.0 to 6.2 ± 1.1, P = 0.020, respectively. No correlation of any HRV parameter with VAS score was found. CONCLUSION: HRV parameters may detect responses to heat pain, but are not suitable to assess pain intensity.

A randomized clinical trial of living donor nephrectomy: a plea for a differentiated appraisal of mini-open muscle splitting incision and hand-assisted laparoscopic donor nephrectomy.

A randomized controlled trial was designed to compare various outcome variables of the retroperitoneal mini-open muscle splitting incision (MSI) technique and the transperitoneal hand-assisted laparoscopic technique (HAL) in performing living donor nephrectomies. Fifty living kidney donors were randomized to MSI or HAL. Primary endpoint was pain experience scored on a visual analogue scale (VAS). After MSI living donors indicated lower median (range) VAS scores at rest than HAL living donors on postoperative day 2.5 [10 (0-44) vs. 15 (0-70), P = 0.043] and day 3 [7 (0-28) vs. 10 (0-91), P = 0.023] and lower VAS scores while coughing on postoperative day 3 [20 (0-73) vs. 42 (6-86), P = 0.001], day 7 [8 (0-66) vs. 33 (3-76), P < 0.001] and day 14 [2 (0-17) vs. 12 (0-51), P = 0.009]. The MSI technique also resulted in reduced morphine requirement, better scores on three domains of the RAND-36, reduced costs and reduced CRP and IL-6 levels. The HAL technique was superior in operating time and postoperative decrease of hemoglobin level. The MSI technique is superior to the HAL technique in performing living donor nephrectomies with regard to postoperative pain experience. This study reopens the discussion of the way to go in performing the living donor nephrectomy.

Quantifying allodynia in patients suffering from unilateral neuropathic pain using von frey monofilaments.

OBJECTIVES: The aim of this study is to investigate whether quantitative sensory testing with Von Frey monofilaments (VFMs) can be used for the quantification of allodynia in patients with chronic neuropathic pain, and how the pain threshold of affected skin differs from healthy skin. METHODS: Using VFMs, we aimed to determine the pain threshold in 22 patients suffering from allodynia as a consequence of a chronic unilateral neuropathic pain syndrome. We performed quantitative sensory testing according to the Method of Limits protocol. We used the patient's own contralateral side and 5 healthy control participants to obtain reference values. RESULTS: On the affected side, we found in 20 out of 22 patients that the pain threshold could be determined with the monofilaments. On average, these 20 patients indicated pain upon the application of monofilament with logarithmic nr. 4.56, whereas no pain threshold could be determined on the contralateral, unaffected side, and in the healthy control participants for any monofilament. DISCUSSION: We showed that although etiology and pathophysiology of allodynia vary individually, with VFMs the clinical symptom allodynia can be quantified in a simple and practical fashion in almost all patients.

Patients' use of the Internet for pain-related medical information.

OBJECTIVE: Patients increasingly use the Internet for medical information. For doctor-patient communication it is important to gain insight into the use and impact of medical Internet searches of patients. This study aims to evaluate patients' use of the Internet for information about their pain problem. METHODS: A self-administered survey on pain-related Internet use was sent to 200 new patients attending a university pain center. The response rate was 61%. RESULTS: Half of all respondents used the Internet for medical information and a smaller percentage (39%) searched for specific information about pain. Patients found information on the Internet to be of good quality and quite easy to find and understand. In general, Respondents did not learn anything new. The on-line medical information confirmed what they already knew. Less than half of the respondents discussed information from the Internet with their physician. CONCLUSION: Half of all patients used the Internet for medical information. Patients are reasonably certain that the information is accurate and reliable, while this may not always be the case. PRACTICE IMPLICATIONS: Physicians should inquire about patients' use of various sources of information (such as the Internet) and offer to clarify any questions or concerns that arise from that use.

Barriers integrating dedicated software for quality management in pain centres.

OBJECTIVES: Explore the feasibility of integrating a dedicated pain centre information system as part of a quality management network with a number of different Hospital Information Systems. MATERIAL & METHODS: A systematic approach integrating and implementing the system in 15 selected hospital organisations (a nationwide 15% non-random sample). RESULTS: Hospitals have widely varying policies on integration and implementation of additional clinically required 3rd party software. Financial and organisational constraints are considerable. Partial data integration could be realised in one third of the hospital organisations within the project timeframe. Linking with various types of Hospital Information Systems from the same or different vendors caused no technical difficulties. The total effort required, however, varies considerably; different versions of a HIS of the same vendor require substantial additional effort. IT departments hardly use standard rules to accept this type of systems, causing substantial increases in completion time for installation. CONCLUSIONS: Although it is feasible to integrate a local departmental system as required (download of general patient, provider and referrer data basically, and also upload of certain data) the workload of scaling to the national level is considered far beyond what is reasonable for a national quality management network for pain. Alternatives for recording and capturing data (which comply with the requirements of the national system) are currently being explored.

Perioperative mortality: Analysis of 3 years of operative data across 7 general surgical projects of Médecins Sans Frontières in Democratic Republic of Congo, Central African Republic, and South Sudan.

BACKGROUND: The African continent has the greatest burden of surgical disability-adjusted life years, yet the least is known about operative care here. This analysis describes the surgical patients admitted to 7 hospitals supported by the Médécins Sans Frontières (MSF) over 3 years in 3 conflict-affected countries-Eastern Democratic Republic of Congo, Central African Republic, and South Sudan. METHODS: A standardized operative data collection tool was used for routine collection of operative inpatient data between 2011 and 2013 at 7 MSF surgical facilities. Surgical records of 14,482 patients were analyzed to describe surgical epidemiology, major procedures, and perioperative mortality. The perioperative mortality rate (POMR) was calculated within 2 days of admission (POMR2) and within 30 days from admission (POMR30). The POMR is used as a marker of quality of operative care. RESULTS: Caesarean delivery was the most common major procedure performed and had a POMR30 of 5.28 per 1,000 admissions. The overall inpatient mortality was 19.67 per 1,000 admissions. Children had greater POMR than adults for the same procedure types (47.97 vs 15.89 deaths per 1,000 admissions, P < .001); 85.1% of all major procedures were emergency procedures and between 3 and 30% of admissions were related to violence. After adjustment, perioperative death was associated with emergency surgery, violence, and age younger than 15 years. CONCLUSION: POMRs varied by age group and type of major procedure performed. Collecting surgical data is achievable and can inform future planning and support for national surgical programs. More information is needed on operative outcomes in adults and children in low-resource settings to improve quality and access to care.

Costs and cost-effectiveness of epidural steroids for acute lumbosacral radicular syndrome in general practice: an economic evaluation alongside a pragmatic randomized control trial.

STUDY DESIGN: A pragmatic, randomized, controlled, single-blinded trial in Dutch general practice. OBJECTIVE: Assessing the costs and cost-effectiveness of adding segmental epidural steroid injections to care as usual in radiculopathy in general practice. SUMMARY OF BACKGROUND DATA: Lumbosacral radicular syndrome (radiculopathy) is a benign, generally self-limiting but painful condition caused by a herniated lumbar intervertebral disc, which results in an inflammatory process around the nerve root. Segmental epidural steroid injections could lessen pain. Low back pain and sciatica form a large financial burden on national health care systems. Improving pain treatment could lower costs to society by diminishing loss of productivity. METHODS: Patients with acute radiculopathy were included by general practitioners. All patients received usual care. Patients in the intervention group received one segmental epidural steroid injection containing 80 mg of triamcinolone as well. Follow-up was performed using postal questionnaires at 2, 4, 6, 13, 26, and 52 weeks. Main outcomes were pain, disability and costs. Economic evaluation was performed from a societal perspective with a time horizon of 1 year. RESULTS: Sixty-three patients were included in the analysis. Mean total costs were €4414 or $5985 in the intervention group and €5121 or $6943 in the control group. This difference was mostly due to loss of productivity. The point estimate for the incremental cost-effectiveness ratio was -€730 or -$990 (1-point diminishment on the numerical rating scale back pain score in 1 patient in the course of 1 yr would save €730 or $990). Bootstrapping showed a 95% confidence interval of -€4476 to €951 or -$6068 to $1289. The cost-effectiveness acceptability curve showed that without additional investment the probability that epidural steroids are cost-effective is more than 80%. CONCLUSION: The effect on pain and disability of epidural steroids in lumbosacral radicular syndrome is small but significant, and at lower costs with no reported complications or adverse effects. Segmental epidural steroid injections could be considered by policy makers as an additional treatment option.

A novel magnetic stimulator increases experimental pain tolerance in healthy volunteers - a double-blind sham-controlled crossover study.

UNLABELLED: The 'complex neural pulse'(TM) (CNP) is a neuromodulation protocol employing weak pulsed electromagnetic fields (PEMF). A pioneering paper reported an analgesic effect in healthy humans after 30 minutes of CNP-stimulation using three nested whole head coils. We aimed to devise and validate a stimulator with a novel design entailing a multitude of small coils at known anatomical positions on a head cap, to improve applicability. The main hypothesis was that CNP delivery with this novel device would also increase heat pain thresholds. Twenty healthy volunteers were enrolled in this double-blind, sham-controlled, crossover study. Thirty minutes of PEMF (CNP) or sham was applied to the head. After one week the other treatment was given. Before and after each treatment, primary and secondary outcomes were measured. Primary outcome was heat pain threshold (HPT) measured with thermal quantitative sensory testing. Other outcomes were warmth detection threshold, and aspects of cognition, emotion and motor performance. As hypothesized heat pain threshold was significantly increased after the PEMF stimulation. All other outcomes were unaltered by the PEMF but there was a trend level reduction of cognitive performance after PEMF stimulation as measured by the digit-symbol substitution task. Results from this pilot study suggest that our device is able to stimulate the brain and to modulate its function. This is in agreement with previous studies that used similar magnetic field strengths to stimulate the brain. Specifically, pain control may be achieved with PEMF and for this analgesic effect, coil design does not appear to play a dominant role. In addition, the flexible configuration with small coils on a head cap improves clinical applicability. TRIAL REGISTRATION: Dutch Cochrane Centre NTR1093.

Bilateral sensory abnormalities in patients with unilateral neuropathic pain; a quantitative sensory testing (QST) study.

In patients who experience unilateral chronic pain, abnormal sensory perception at the non-painful side has been reported. Contralateral sensory changes in these patients have been given little attention, possibly because they are regarded as clinically irrelevant. Still, bilateral sensory changes in these patients could become clinically relevant if they challenge the correct identification of their sensory dysfunction in terms of hyperalgesia and allodynia. Therefore, we have used the standardized quantitative sensory testing (QST) protocol of the German Research Network on Neuropathic Pain (DFNS) to investigate somatosensory function at the painful side and the corresponding non-painful side in unilateral neuropathic pain patients using gender- and age-matched healthy volunteers as a reference cohort. Sensory abnormalities were observed across all QST parameters at the painful side, but also, to a lesser extent, at the contralateral, non-painful side. Similar relative distributions regarding sensory loss/gain for non-nociceptive and nociceptive stimuli were found for both sides. Once a sensory abnormality for a QST parameter at the affected side was observed, the prevalence of an abnormality for the same parameter at the non-affected side was as high as 57% (for Pressure Pain Threshold). Our results show that bilateral sensory dysfunction in patients with unilateral neuropathic pain is more rule than exception. Therefore, this phenomenon should be taken into account for appropriate diagnostic evaluation in clinical practice. This is particularly true for mechanical stimuli where the 95% Confidence Interval for the prevalence of sensory abnormalities at the non-painful side ranges between 33% and 50%.

Somatosensory profiles but not numbers of somatosensory abnormalities of neuropathic pain patients correspond with neuropathic pain grading.

Due to the lack of a specific diagnostic tool for neuropathic pain, a grading system to categorize pain as 'definite', 'probable', 'possible' and 'unlikely' neuropathic was proposed. Somatosensory abnormalities are common in neuropathic pain and it has been suggested that a greater number of abnormalities would be present in patients with 'probable' and 'definite' grades. To test this hypothesis, we investigated the presence of somatosensory abnormalities by means of Quantitative Sensory Testing (QST) in patients with a clinical diagnosis of neuropathic pain and correlated the number of sensory abnormalities and sensory profiles to the different grades. Of patients who were clinically diagnosed with neuropathic pain, only 60% were graded as 'definite' or 'probable', while 40% were graded as 'possible' or 'unlikely' neuropathic pain. Apparently, there is a mismatch between a clinical neuropathic pain diagnosis and neuropathic pain grading. Contrary to the expectation, patients with 'probable' and 'definite' grades did not have a greater number of abnormalities. Instead, similar numbers of somatosensory abnormalities were identified for each grade. The profiles of sensory signs in 'definite' and 'probable' neuropathic pain were not significantly different, but different from the 'unlikely' grade. This latter difference could be attributed to differences in the prevalence of patients with a mixture of sensory gain and loss and with sensory loss only. The grading system allows a separation of neuropathic and non-neuropathic pain based on profiles but not on the total number of sensory abnormalities. Our findings indicate that patient selection based on grading of neuropathic pain may provide advantages in selecting homogenous groups for clinical research.

Fear of movement in pre-operative patients with a lumbar stenosis and or herniated disc: factor structure of the Tampa scale for kinesiophobia.

The presence of fear of movement is related to higher disability rates in several patient groups. The purpose of this study was first to analyze fear of movement and the relation with pain and disability in pre-operative patients with low back pain and radiculopathy and secondly to analyze the factor structure of the Dutch version of the Tampa Scale for Kinesiophobia (TSK). The TSK and Pain Disability Index (PDI) were assessed in 128 patients. An explorative factor analysis (EFA) and a confirmatory factor analysis (CFA) of the TSK were performed using Structural Equation Models (SEMs). Fear of movement was significantly related to leg-pain and pain disability. A four-factor model had an explained variance of 49%. After further analyses a solution with three factors (harm, somatic focus, activity avoidance) and nine items (1, 3, 6, 7, 9, 11, 14, 15, 17) had the best fit. Based on the content of this study clinically a factor structure with three subscales with nine items is favorable for usage in pre-operative patients with low back pain and radiculopathy.

Chronic pain and severe disuse syndrome: long-term outcome of an inpatient multidisciplinary cognitive behavioural programme.

OBJECTIVE: Patients with chronic pain and severe disuse syndrome have pain with physiological, psychological and social adaptations. The duration and severity of complaints, combined with previously failed treatments, makes them unsuitable for treatment in primary care. DESIGN: A prospective waiting list controlled study. PATIENTS: A total of 32 patients with chronic pain for at least one year and severe disuse syndrome were included in an inpatient multidisciplinary cognitive behavioural treatment. METHODS: Patients were assessed before the waiting list period, before the clinical phase, after the clinical phase and after follow-ups of 6 months and one year. The visual analogue scale for pain and fatigue were assessed. Muscle strength of the arms and legs, arm endurance and a 6-minute walking test were used to assess physical outcome. The Symptom Checklist-90, RAND-36, pain cognition list and the Tampa scale for kinesiophobia were used to assess psychological outcome. RESULTS: Long-term significant (p < 0.001) improvements were found for pain, fatigue, walking distance, muscle strength, anxiety, depression, somatization, negative self-efficacy, and catastrophizing in the intervention period. CONCLUSION: An inpatient multidisciplinary cognitive behavioural programme is beneficial for patients with chronic pain and a severe disuse syndrome.

Illness perceptions in patients with fibromyalgia and their relationship to quality of life and catastrophizing.

OBJECTIVE: In the last decade, illness perceptions have been identified as important in the treatment of fibromyalgia (FM). The aim of the present study was to examine illness perceptions and use of the revised Illness Perception Questionnaire in patients with FM (IPQ-R-FM) and their relationship to quality of life and catastrophizing. METHODS: A domain with specific causal attributions related to FM was added to the IPQ-R-FM. The psychometric properties of the IPQ-R-FM dimensions and attribution scales were examined. The causal domain, in which patients describe the most important perceived causes for their FM, was analyzed. To analyze the relationship with quality of life and catastrophizing, the Fibromyalgia Impact Questionnaire and the Pain Catastrophizing Scale were used. RESULTS: Fifty-one outpatients completed the questionnaires on 2 occasions, 3 weeks apart. FM was considered to be chronic and to have serious consequences; patients perceived little personal control and did not expect medical treatment to be effective. The psychometric properties of the IPQ-R-FM were found to be adequate. Patients most frequently attributed the causes of FM to an external somatic source (58%). Quality of life was related to experiencing more consequences attributable to FM. Catastrophizing was related to a limited understanding of the symptoms of FM, the more cyclical nature of FM, and an emotional representation. CONCLUSION: The IPQ-R-FM is a useful tool to assess illness perceptions in patients with FM. Illness perceptions are related to quality of life and catastrophizing; therefore, it seems important to assess and integrate illness perceptions into the management of patients with FM.

Quantitative sensory testing with Von Frey monofilaments in patients with allodynia: what are we quantifying?

The International Association for the Study of Pain defines allodynia as pain due to a stimulus that does not normally provoke pain and hyperalgesia as an increased response to a stimulus, which is normally painful. However, does "normally painful" mean "any stimulation of nociceptors" or "the subjective pain response?" We argue that "normally painful" should not mean "any stimulation of nociceptors," as Von Frey monofilaments may evoke a pricking sensation--which implies the involvement of nociceptors--without necessarily leading to a subjective pain perception. In this paper, we propose that the diagnosis of either allodynia or hyperalgesia should be based on the patient's report, that is, painful versus not painful, rather than on the (sub) type of afferent fiber involved.