Aims. The aim of the study was to determine if there was a direct correlation between the pain and disability experienced by patients and size of their disc prolapse, measured by the disc’s cross-sectional area on T2 axial MRI scans. Methods. Patients were asked to prospectively complete visual analogue scale (VAS) and Oswestry Disability Index (ODI) scores on the day of their MRI scan. All patients with primary disc herniation were included. Exclusion criteria included recurrent disc herniation, cauda equina syndrome, or any other associated spinal pathology. T2 weighted MRI scans were reviewed on picture archiving and communications software. The T2 axial image showing the disc protrusion with the largest cross sectional area was used for measurements. The area of the disc and canal were measured at this level. The size of the disc was measured as a percentage of the cross-sectional area of the spinal canal on the chosen image. The VAS leg pain and ODI scores were each correlated with the size of the disc using the Pearson correlation coefficient (PCC). Intraobserver reliability for MRI measurement was assessed using the interclass correlation coefficient (ICC). We assessed if the position of the disc prolapse (central, lateral recess, or foraminal) altered the symptoms described by the patient. The VAS and ODI scores from central and lateral recess disc prolapses were compared. Results. A total of 56 patients (mean age 41.1 years (22.8 to 70.3)) were included. A high degree of intraobserver reliability was observed for MRI measurement: single measure ICC was 0.99 (95% confidence interval (CI) from 0.97 to 0.99 (p < 0.001)). The PCC comparing VAS leg scores with canal occupancy for herniated disc was 0.056. The PCC comparing ODI for herniated disc was 0.070. We found 13 disc prolapses centrally and 43 lateral recess prolapses. There were no foraminal prolapses in this group. The position of the prolapse was not found to be related to the mean VAS score or ODI experienced by the patients (VAS, p = 0.251; ODI, p = 0.093). Conclusion. The results of the statistical analysis show that there is no direct correlation between the size or position of the disc prolapse and a patient’s symptoms. The symptoms experienced by patients should be the primary concern in deciding to perform discectomy. Cite this article: Bone Joint J 2022;104-B(6):715–720

Aims. To study the associations of lumbar developmental spinal stenosis (DSS) with low back pain (LBP), radicular leg pain, and disability. Methods. This was a cross-sectional study of 2,206 subjects along with L1-S1 axial and sagittal MRI. Clinical and radiological information regarding their demographics, workload, smoking habits, anteroposterior (AP) vertebral canal diameter, spondylolisthesis, and MRI changes were evaluated. Mann-Whitney U tests and chi-squared tests were conducted to search for differences between subjects with and without DSS. Associations of LBP and radicular pain reported within one month (30 days) and one year (365 days) of the MRI, with clinical and radiological information, were also investigated by utilizing univariate and multivariate logistic regressions. Results. Subjects with DSS had higher prevalence of radicular leg pain, more pain-related disability, and lower quality of life (all p < 0.05). Subjects with DSS had 1.5 (95% confidence interval (CI) 1.0 to 2.1; p = 0.027) and 1.8 (95% CI 1.3 to 2.6; p = 0.001) times higher odds of having radicular leg pain in the past month and the past year, respectively. However, DSS was not associated with LBP. Although, subjects with a spondylolisthesis had 1.7 (95% CI 1.1 to 2.5; p = 0.011) and 2.0 (95% CI 1.2 to 3.2; p = 0.008) times greater odds to experience LBP in the past month and the past year, respectively. Conclusion. This large-scale study identified DSS as a risk factor of acute and chronic radicular leg pain. DSS was seen in 6.9% of the study cohort and these patients had narrower spinal canals. Subjects with DSS had earlier onset of symptoms, more severe radicular leg pain, which lasted for longer and were more likely to have worse disability and poorer quality of life. In these patients there is an increased likelihood of nerve root compression due to a pre-existing narrowed canal, which is important when planning surgery as patients are likely to require multi-level decompression surgery. Cite this article: Bone Joint J 2021;103-B(1):131–140

Purpose. Prospectively evaluate the timescale of leg pain resolution after lumbar discectomy and decompression, in the immediate post-operative period and identify possible risk factors for failure/delay in leg pain resolution. Materials and Methods. A prospective observational study of 100 consecutive patients undergoing lumbar discectomy or decompression. Patients recorded their leg and back pain in VAS and disability in ODI preoperatively. Patients rated their leg pain relief just prior to discharge after surgery. Telephone follow-up at 1-2 week and 3-4 week post-op was followed by clinic review at 6 and 12 weeks, to assess the timescale of leg pain resolution and improvement in function (ODI score). Results. Immediately before discharge from hospital 67% patients reported relief of leg pain. 33% reported no relief or were unsure. Of these, 26 (80%) reported pain relief subsequently. At 1-2 weeks, 81 patients reported pain relief. 14 reported persistent pain, but six of them (45%) improved subsequently. By six weeks 91% reported leg pain relief and only two of the unimproved nine patients subsequently experienced relief of leg pain. Failure to improve the leg pain was clearly associated with failure to improve disability by ODI score. But the ODI score did not improve in 11 patients reporting relief of leg pain. Decompression in older age and women had a relatively higher risk of poor result. Conclusion. After lumbar discectomy and decompression, leg pain relief is immediate in 67%, in 81% by one week and in 91% by six weeks. Improvement is unlikely after this period. Non-resolution of leg pain resulted in persistent/worsened disability, but 11% patients did not improve functionally despite experiencing leg pain relief. Decompression, older age and female sex were negative risk factors

Purpose. To establish if the subjective features of both bilateral leg pain and sexual dysfunction are presenting features in cauda equina syndrome (CES). Background. There appears to be conflicting expert opinion ‘red flag’ symptoms in the context of CES with many experts basing clinical decisions on the objective clinical findings only. Bilateral radiculopathy has been suggested as a possible sign of suspected CES, although a consensus statement by BASS and SBNS makes no reference to either this or sexual dysfunction. However, bilateral leg pain is included in the NICE clinical knowledge summary and sexual dysfunction is highlighted within CES guidance by the American Association of Neurological Surgeons. Methods. The clinical documentation of patients undergoing urgent magnetic resonance imaging (MR) due to clinical suspicion of cauda equina syndrome (CES) was reviewed over 12 months. Patients questioned regarding sexual function were included in this retrospective analysis (n=179), along with those with bilateral leg pain (n=294). Patients with confirmed cauda equina compression (CES +ve) were compared to those without (CES -ve). A logistic regression was applied to find the odds ratio. Results. In CES +ve 37.5% had sexual dysfunction, 48% had bilateral leg pain. CES –ve 14% had sexual dysfunction, 27% bilateral leg pain. Both significant to p=0.015 with an odds ratio of 3.6 and 2.5 respectively. Conclusions. Both sexual dysfunction and bilateral leg pain do appear to be ‘red flags’ for CES and should therefore be asked in the ED to aid clinical reasoning when suspecting this diagnosis. No conflicts of interest. No funding obtained

Background. Medication prescribing patterns for patients with neuropathic low back-related leg pain (LBLP) in primary care are unknown. Purpose. To estimate the proportion of patients prescribed pain medications, describe baseline characteristics of patients prescribed neuropathic pain (NP) medication and estimate the proportion of LBLP patients with refractory NP. Methods. General practice electronic medical and prescribing records of a large (n=609), prospective, primary-care cohort of LBLP patients were analysed. Cases of NP were identified using the self-report version of the NP scale, Leeds Assessment for Neurological Symptoms and Signs (score of ≥12 indicates possible NP) (n=293). Patients with leg pain intensity ≥ 5 (mean of three 0–10 NRSs) or <30% reduction in disability (RMDQ 0–23) at 4-months compared to baseline and who were prescribed ≥ 2 NP medications were considered to have refractory NP. Results. 82% (223/273) of patients with NP were prescribed at least one pain medication; 29% (80/273) of patients were prescribed one first-line NP medication (for example Amitriptyline). Patients who were prescribed NP medication(s) had higher leg pain intensity and disability. There was evidence that patients improved with (61%, 41/67) and without (75%, 76/102) having been prescribed NP medication. Few patients (4%, 7/169) met the criteria for refractory NP suggesting that the scale of the problem in primary care is limited. Conclusion. Patients with NP were commonly prescribed pain medication, under a third were prescribed NP medication and many patients improved without such medication. Future research is needed to determine the effectiveness of NP medication. No conflicts of interest. Sources of funding: Sarah Harrisson is a Clinical Doctoral Fellow funded through a National Institute for Health Research (NIHR) Research Professorship awarded to Nadine Foster (NIHR-RP-011-015). Nadine Foster is a NIHR Senior Investigator. Kika Konstantinou is supported by a Higher Education Funding Council for England/ National Institute for Health Research Senior Clinical Lectureship. The views expressed in this publication are those of the author(s), not necessarily those of the NHS, NIHR or the Department of Health and Social Care. This work relates to an Education and Continued Professional Development (level 2) award by the Musculoskeletal Association of Chartered Physiotherapists to Sarah Harrisson (June 2016)

Background. Pain with radiation to the leg is a common presentation in back pain patients. Radiating leg pain is either referred pain or radicular, commonly described as sciatica. Clinically distinguishing between these types of leg pain is recognized as difficult but important for management purposes. The aim of this study was to investigate inter-therapist agreement when diagnosing referred or radicular pain. Methods. Thirty-six primary care consulters with low back-related leg pain were assessed and diagnosed as referred or radicular leg pain by one of six trained experienced musculoskeletal physiotherapists. Assessments were videoed, excluding any diagnosis discourse, and viewed by a second physiotherapist who made an independent diagnosis. Therapists rated their confidence with diagnosis and reasons for their decision. Data was summarized using percentage agreements and kappa (K) coefficients with two sided 95% confidence intervals (CI). Results. The therapists assessing and therapists watching the video both diagnosed radicular pain in 25 of the 36 patients. Agreement was 72% with fair inter-rater reliability (K = 0.35, 95% CI 0.07, 0.63, p<0.05). Mean confidence in diagnosis was 87% for radicular pain and 83% for referred pain. In the subgroup of patients where therapists' confidence in diagnosis was ≥ 80% (n=28), agreement was 86% with substantial reliability (K = 0.65, 95% CI 0.37, 0.93 p<0.001). Conclusion. Reliability was fair among therapists when diagnosing back-related leg pain. This concurs with current opinion that differentiating between types of back-related leg pain can be difficult. However, when confidence in clinical diagnosis is high, levels of agreement and reliability indices improve substantially

Background. Leg pain frequently accompanies low back pain and is associated with increased levels of disability and higher health costs than simple low back pain. Distinguishing between different types of low back- related leg pain (LBLP) is important for clinical management and research applications. The aim of this systematic review was to identify, describe and appraise papers that classify or subgroup populations with LBLP. Methods. The search strategy involved nine electronic databases including Medline and Embase, reference lists of eligible studies and relevant reviews. Selected papers were quality appraised independently by two reviewers using a standardised scoring tool. Results. Of 13,337 potential eligible citations, 49 relevant papers were identified that reported on 20 classification systems. Papers were grouped according to purpose and criteria of the classification systems. Five themes emerged: (i) pathoanatomical sources of pain (ii) clinical features, (iii) pain mechanisms, (iv) treatment based approach and (v) screening tools and prediction rules. Four of the twenty systems focused specifically on LBLP populations. Pain mechanisms and treatment based approach systems scored highest following quality appraisal as authors generally included statistical methods to develop their classifications and supporting work had been published on the systems' validity, reliability and generalizability. Conclusion. Numerous classification systems exist that include patients with leg pain, a minority of them focus specifically on distinguishing between different presentations of leg pain. Further work is needed to identify clinically meaningful subgroups of LBLP patients, ideally based on large primary care cohort populations and using stringent methods for classification system development. This abstract has not been previously published in whole or substantial part nor has it been presented previously at a national meeting. Conflicts of interest: No conflicts of interest. S Stynes is supported by an NIHR/HEE Clinical Doctoral Research Fellowship. Dr Konstantinou is supported by an HEFCE/NIHR Senior Clinical Lectureship. Professor Dunn is supported by the Wellcome Trust (083572)

Background. Low back-related leg pain (LBLP) is clinically diagnosed as referred leg pain or sciatica. Within the spectrum of LBLP there may be unrecognised subgroups of patients. This study aimed to identify and describe clusters of LBLP patients using latent class analysis (LCA). Methods. The study population were 609 LBLP primary care consulters. Variables from clinical assessment were included in the LCA. Characteristics of the statistically identified clusters were described and compared to the clinically defined groups of LBLP patients. Results. A five cluster solution was optimal. Cluster one (n=104) had mild leg pain severity, no clinical signs suggestive of sciatica and more anxiety. Cluster two (n=122), three (n=188) and four (n=69) represented mild, moderate and severe sciatica in terms of response to clinical assessment items, pain severity and impact on function. Cluster five (n=126) was more difficult to define based on response to clinical assessment items (below knee pain and possible neural tension) and had a similar severe profile to cluster four in terms of high pain, disability, psychosocial factors, work impact and risk of poor outcome; but had longer duration pain and more comorbidities. Cluster three consistently mirrored the profile of the overall group of patients with a clinical diagnosis of sciatica. Cluster one mirrored the referred leg pain group. Conclusion. This is the first study that used LCA to classify LBLP patients, including sciatica. These clusters could represent more homogenous groups that may require different treatment approaches. Further work will describe the clinical course and longer term outcomes of these clusters. No conflicts of interest. S Stynes is supported by an NIHR/CNO Clinical Doctoral Research Fellowship (CDRF-2010-055). Dr Konstantinou is supported by a HEFCE/NIHR Senior Clinical Lectureship. Professor Hay is a NIHR Senior Investigator

Purpose of study and background. Neuropathic pain is a challenging pain syndrome to manage. Low back-related leg pain (LBLP) is clinically diagnosed as either sciatica or referred leg pain and sciatica is often assumed to be neuropathic. Our aim was to describe the prevalence and characteristics of neuropathic pain in LBLP patients. Methods. Analysis of cross-sectional data from a prospective, primary care cohort of 609 LBLP patients. Patients completed questionnaires, and received clinical assessment including MRI. Neuropathic characteristics (NC) were measured using the self-report version of the Leeds Assessment of Neuropathic Symptoms and Signs scale (SLANSS; score of ≥12 indicates pain with NC). Results. 52% of the patients diagnosed with sciatica and 39% of those diagnosed with referred leg pain presented with pain with NC. Irrespective of LBLP diagnosis, patients with NC reported significantly worse leg pain (mean 5.8 vs 4.7), back pain intensity (0.0 vs 0.0), disability (RMDQ 15.2 vs 12.4), high risk of persistent disabling pain (47.5% vs 31.5%), depression (HADS 7.3 vs 5.4) and anxiety (8.9 vs 6.7), compared to patients without NC. Sciatica patients with NC presented with higher leg pain (6.0 vs 4.8) and disability but less anxiety (8.6 vs 10.2) and depression compared to patients with referred pain with NC. Conclusion. LBLP patients with NC present with more severe pain, disability and psychological morbidity, but these characteristics differ according to clinical diagnosis, suggesting potential subgroups. The data will inform future research on the clinical course and prognosis of these patients. No conflicts of interest. Sources of funding: Support for SA Harrisson, a National Institute for Health Research (NIHR) Clinical Doctoral Fellow and NE Foster, an NIHR Senior Investigator, was provided by an NIHR Research Professorship awarded to NE Foster (NIHR-RP-011-015). K Konstantinou is supported by a Higher Education Funding Council for England/ NIHR Senior Clinical Lectureship. The views expressed in this publication are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health

Background: Radicular pain has been reported even in the absence of a compressive lesion. It has been postulated that annular tears provide a conduit for pro-inflammatory substances, which can leak around the nerve root causing radiculitis. A link between the side of back pain and the side of the annular tear has been reported. Objective: To establish whether the side of the annular tear may influence the side of the leg in a non-compressive setting. Methods and patients: We identified 121 patients from the patients referred to our unit with back and radicular leg pain. The mean age of the cohort was 50 yrs and 49% were male. All these patients were investigated with an MRI scan that demonstrated no compression of the nerve root. We used strict exclusion criteria to exclude the patients with any neural compression, previous lumbar operation, degenerative deformity or an associated pathology such as peripheral neuropathy. Results: The annular pathology was described as annular tears (47 patients) and non compressive disc bulges (106 patients). The odds ratio for the concurrence of an annular tear causing ipsilateral leg pain is 1.05 and for a non-compressive disc bulge causing ipsilateral leg pain is 2.14. Conclusion: A non-compressive disc bulge is more likey to cause radicular symptoms than an annular tear. Though, both these annular lesions can cause ipsilateral nerve root symptoms

Background. Persistent low back and leg pain is a common and highly disabling musculoskeletal condition. Many patients seek the opinion of a neurosurgeon with a view to surgical intervention. Few data are available which document the experiences of patients at these consultations. Aims. To investigate the experiences of patients seeking a neurosurgical opinion for back and leg pain. Methods. 15 patients (Males 9 Females 6) were consented and recruited into this study and participated in an in-depth semi-structured interview about their experiences of the consultation. Interviews were recorded and transcribed. Transcribed data were read independently by two researchers and analysed using grounded theory. Results. Three subgroups of patients were identified from the interviews. Group 1: Patients that were offered surgery and described a positive experience. Group 2: Patients that were not offered surgery and described a positive experience. Group 3: Patients that were not offered surgery and described a negative experience. Analysis revealed a number of different themes pertaining to the experiences of each group. However, two overarching themes of i) meeting patients' expectations and ii) the factor of hope, emerged as significant contributors to their experience and were evident in all three subgroups. Conclusion. Findings identified the need to manage patient expectations in the consultation in order to provide a positive experience. Providing patients with hope who are not undergoing surgery, but who have an expectation for it, is likely to provide a more positive experience and therefore increased satisfaction with care. No conflicts of interest. Part funded by North East London Foundation Trust

Objective scoring techniques for back pain are increasingly being used both in the pre-operative selection of patients and as a post-operative outcome measure. Our aim was to determine the strength of correlation between three main scoring techniques used to quantify the severity of the back or leg pain on presentation to a chronic back pain clinic. The Oswestry Disability Index (ODI), the Medical Outcomes Study 36 item Short Form Health Survey (SF36), and the Visual Analogue Scale (VAS) were competed by 130 patients between July and December 1999. There were 65 males and 65 females with the mean age of 49 years. The patients were divided into three groups: with back pain only, sciatic leg pain only, and those with both. The correlation was analysed using the Pearson correlation test. There was a good correlation between the Oswestry Disability Index and Visual Analogue Scale for patients with back pain (r=0.641, p< 0.001) and with sciatic leg pain (r=0.469, p< .001). The physical component of the SF36 strongly correlates with the VAS in back pain (r=0.364) and sciatic leg pain (r=1). However there is a poor correlation between the ODI and VAS and all other components of the SF36

Purpose: To evaluate whether the presence of leg pain influences healthcare use and work disability in patients with low back pain (LBP). Methods: Prospective cohort study of primary care consulters with LBP in North Staffordshire and Cheshire. Patients completed questionnaires at baseline and 12 months, collecting data on back pain, work and healthcare utilisation. At baseline, patients were classified as reporting. LBP only,. LBP + leg pain above knee only or. LBP + leg pain extending below the knee. Results: 456 patients had complete data and were included in this analysis. At baseline, 191 (42%) reported LBP only, 116 (25%) leg pain above the knee and 149 (33%) leg pain below the knee. In comparison to those with LBP only, patients reporting leg pain below knee were more likely to be referred to secondary care (46% vs 17%, p< 0.01), to re-consult their GP (68% vs 43%, p< 0.01) and to receive physiotherapy (40% vs 21%, p< 0.01) in the 12 months after baseline. At 12 months, those with leg pain below knee were less likely to be employed (67% vs 81%, p=0.01) than patients with LBP alone, more likely to have time off work (55% vs 31%, p< 0.01) or be on reduced work duties. Conclusions: Self-reported leg pain is common. These patients access significantly more healthcare and are more likely to be off work over 12 months. This highlights the need for early identification of patients with concurrent leg pain and appropriate targeting of interventions to reduce work disability. Conflicts of Interest: None. Funding source: Arthritis Research Campaign

Background. 60% of back pain patients report pain radiation in the leg(s), which is associated with worse symptoms and poorer recovery. The majority are treated in primary care, but detailed information about them is scarce. The objective of this study is to describe the characteristics of patients with back and leg pain-seeking treatment in primary care. Methods. Adult patients consulting their GP with back and leg pain were invited to the study. Participants completed questionnaires including sociodemographic, physical and psychosocial measures. They also underwent standardised clinical assessments by physiotherapists, and received an MRI scan. Results. 609 patients participated with 67.5% reporting pain below the knee. 62.6% were female, sample mean (SD) age 50.2 (13.9). 367 (60.7%) were in paid employment with 39.7% reporting time off work. Mean disability (RMDQ) was 12.7 (5.7) and mean pain intensity was 5.6 (2.2) and 5.2 (2.4) for back and leg respectively. Mean sciatica bothersomeness index (SBI) score was 14.9 (5.1). 74.2% (452/609) were clinically diagnosed as having sciatica. Patients in the sciatica group reported significantly higher levels of leg pain and SBI scores, leg pain worse than back pain and pain below the knee. Neuropathic pain was more prevalent in patients with referred leg pain. Conclusion. This primary care cohort reported high levels of disability and pain. Three quarters were diagnosed with sciatica. Follow-up of this cohort will investigate the prognostic value of their baseline characteristics. This abstract summarises independent research funded by the National Institute for Health Research (NIHR) under its Programme Grants for Applied Research Programme (Grant Reference Number RP-PG-0707-10131). The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health. This abstract has not been previously published in whole or substantial part nor has it been presented previously at a national meeting. Conflicts of interest: No conflicts of interest. K. Konstantinou is supported by a HEFCE/NIHR Senior Clinical Lectureship. KM Dunn is supported by the Wellcome Trust (083572)

Increasing attention has focused on the spinal muscles with respect to stability and low back pain (LBP) with suggestions of a de-conditioning syndrome. What is less clear is the extent of this degeneration and whether it is a long term of short term consequence of LBP. This study sought to explore the cross section area (CSA) and muscle quality of the spinal extensor group in a subset of LBP patients. MRI scans of 100 spinal clinic patients were retrospectively reviewed; sagittal and transverse (from levels L3-5) images were annoymised and archived along with details of age, gender and presenting symptoms. An image analysis package was used to determine CSA of the extensor muscle groups, and levels of fat infiltration were calculated using a pseudocolouring technique. 46 patients had spinal stenosis (28 males, 18 females, mean age 66±14.2 years) and 54 had a disc prolapse (28 males, 26 females, mean age 50±12.9 years). CSA was significantly smaller in the stenotics at both L3/4 and L4/5. Patients presenting with leg pain and a disc herniation had a significantly smaller CSA (p< 0.01) at L3/4 and L4/5 levels. A left right CSA asymmetry was noted but this was not specific to diagnosis, or presenting symptoms. Fat infiltration was present in both groups but was significantly greater in the stenotic group (p< 0.01) and was present at a similar degree at all spinal levels. Multiple regression analysis confirmed that reduced CSA was linked to leg pain (p< 0.01) and age was linked with fat infiltration (0< 0.01). Conflict of Interest: None. Source of Funding: None

Background. There is a paucity of prognosis research in patients with neuropathic low back-related leg pain (LBLP) in primary care. Purpose. To investigate the clinical course and prognostic factors in primary care LBLP patients consulting with neuropathic pain (NP). Methods. LBLP patients in a primary-care cohort study (n=606) completed the self-report version of Leeds Assessment for Neurological Symptoms and Signs (s-LANSS, score of ≥12 indicates possible NP) at baseline and 4-months. Mixed effects models compared pain-intensity (highest of mean leg or mean back pain - 0–10 NRS at baseline, 4-months, 12-months and 3-years) between those with persistent NP (s-LANSS ≥12 at baseline and 4-months) and those without (s-LANSS ≥12 at baseline and <12 at 4-months). Univariable and multivariable binary logistic regression examined association between potential prognostic factors (chosen from baseline self-report questionnaires, clinical examination, MRI scan findings) and persistent NP. Multiple imputation was used to account for missing data. Results. 44% (72/164) of patients with NP at baseline had persistent NP at 4-months. Mean pain intensity of patients with persistent NP was higher at 4-months, 12-months and 3-years compared to those without. In univariable analysis, only pain self-efficacy was significantly associated with persistent NP (OR 0.98, 95% CI 0.96 to 0.998). In multivariable analysis, none of the 7 investigated factors were significantly associated with persistent NP. Conclusion. Patients with persistent NP were consistently worse-off up to 3-years follow-up compared to those without. It was difficult to identify those patients with NP at baseline who would have persistent NP at 4-months. No conflicts of interest. Sources of funding: Sarah Harrisson is a Clinical Doctoral Fellow funded through a National Institute for Health Research (NIHR) Research Professorship for Nadine Foster (NIHR-RP-011-015). Nadine Foster is a NIHR Senior Investigator. Kika Konstantinou is supported by a Higher Education Funding Council for England/ National Institute for Health Research Senior Clinical Lectureship. The views expressed in this publication are those of the author(s), not necessarily those of the NHS, NIHR or the Department of Health and Social Care. This work relates to an Education and Continued Professional Development (level 2) award by the Musculoskeletal Association of Chartered Physiotherapists to Sarah Harrisson (June 2016)

Introduction: Recombinant human bone morphogenic protein-2 (rhBMP-2) eliminates the need for iliac crest bone graft and has superior fusion rates in anterior interbody fusion1. Post-operative neck swelling has precluded its use in cervical fusion2. Peri-rhBMP-2 oedema is a proposed cause of neuropathic leg pain in posterolateral lumbar fusion. We aimed to compare the incidence of leg pain in a rhBMP-2 treated cohort with a control group following posterolateral lumbar fusion and to determine radiological evidence of a mechanical cause for leg pain in either group. Methods and Results: A single surgeon, multi-centre elective practice was retrospectively reviewed over a four-year period. All rhBMP-2 treated patients were included. Control patients included all primary instrumented lumbar fusions. Endpoints included single observer recorded leg pain. There were 64 and 40 patients in the rhBMP-2 treated and control group respectively. Pre-operative demographics and diagnoses were similar. Inter-body cages were used equally. Three patients had non-mechanical leg pain in the control group versus eleven in the rhBMP-2 group of which 6 were revision surgeries. None of the control group had previous lumbar fusion (p< 0.05). Within the rhBMP-2 group, cage use was similar for leg pain (31%) and non-leg pain (29%). Conclusion: In primary lumbar fusion surgery, there is no significant difference in post-operative MRI-identifiable mechanical leg pain between rhBMP-2 treated and non-treated groups. RhBMP-2 loaded cages do not increase the risk of leg pain. Recombinant hBMP-2 is safe to use in posterolateral lumbar surgery. Conflicts of Interest: None. Source of Funding: None

Background:. Identification of nerve root involvement (NRI) in patients with low back-related leg pain (LBLP) can be challenging. Diagnostic models have mainly been developed in secondary care with conflicting reference standards and predictor selection. This study aims to ascertain which cluster of items from clinical assessment best identify NRI in primary care consulters with LBLP. Methods:. Cross-sectional data on 395 LBLP consulters were analysed. Potential NRI indicators were seven clinical assessment items. Two definitions of NRI formed the reference standards: (i) high confidence (≥80%) NRI clinical diagnosis (ii) high confidence (≥80%) NRI clinical diagnosis with confirmatory magnetic resonance imaging (MRI) findings. Multivariable logistic regression models were constructed and compared for both reference standards. Model performances were summarised using the Hosmer-Lemeshow statistic and area under the curve (AUC). Bootstrapping assessed internal validity. Results:. NRI clinical diagnosis model retained five items. The model with MRI in the reference standard retained six items. Four items remained in both models: below knee pain, leg pain worse than back pain, positive neural tension tests, neurological deficit (myotome, reflex or sensory). NRI clinical diagnosis model was well calibrated (p=0.17) and discrimination was AUC 0.96 (95%CI: 0.93, 0.98). Performance measures for clinical diagnosis plus confirmatory MRI model showed good discrimination (AUC 0.83, 95% CI: 0.78, 0.86) but poor calibration (p=0.01). Bootstrapping revealed minimal overfitting in both models. Conclusion:. A cluster of items identified NRI in LBLP consulters. These criteria could be used clinically and in research to improve accuracy of identification and homogeneity of this subgroup of low back pain patients

Background. Patients with low back-related leg pain (LBLP) can present with neuropathic pain; it is not known but is often assumed that neuropathic pain persists over time. This research aimed to identify cases with neuropathic pain that persisted at short, intermediate and longer-term time points, in LBLP patients consulting in primary care. Methods. LBLP patients in a primary care cohort study (n=606) completed the self-report version of Leeds Assessment for Neurological Symptoms and Signs (s-LANSS, score of ≥12 indicates possible neuropathic pain) at baseline, 4-months, 12-months and 3-years. S-LANSS scores and percentages of patients with score of ≥12 are described at each time-point. Multiple imputation was used to account for missing data. Results. At baseline, 48.3% (293/606) of patients presented with neuropathic pain, 25.0% (94/376) at 4-months, 22.6% (79/349) at 12-months and 21.6% (58/268) at 3-years. A small proportion (6.6%) scored ≥ 12 at all four time-points. Those who scored ≥ 12 at baseline and 4-months reported higher disability (RMDQ (0–23) 15.2) and depression scores (HADS (0–21) 8.6), and lower pain self-efficacy (PSEQ (0–60) 27.2), compared to those with neuropathic pain at one other time-point at most. Conclusion. Few LBLP patients in primary care present with long-term persistent neuropathic pain. Patients with neuropathic pain at baseline and short-term follow-up present with greater morbidity in terms of disability, depression and lower confidence to manage their pain. This is important because these patients may benefit the most from early intervention using neuropathic pain medication. These findings will inform research investigating potential prognostic indicators of persistent neuropathic pain. Conflicts of interest: None. Sources of funding: Support for SA Harrisson, a National Institute for Health Research (NIHR) Clinical Doctoral Fellow and NE Foster, an NIHR Senior Investigator, was provided by an NIHR Research Professorship awarded to NE Foster (NIHR-RP-011-015). K Konstantinou is supported by a Higher Education Funding Council for England/ NIHR Senior Clinical Lectureship. The views expressed in this publication are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health

Background. Criticisms about overuse of MRI in low back pain are well documented. Yet, with the exception of suspicion of serious pathology, little is known about factors that influence clinicians' preference for MRI. We investigated the factors associated with physiotherapists' preference for MRI for patients consulting with benign low back and leg pain (LBLP) including sciatica. Methods. Data were collected from 607 primary care patients consulting with LBLP and assessed by 7 physiotherapists, in the ATLAS cohort study. Following clinical assessment, physiotherapists documented whether he/she wanted the patient to have an MRI. Factors potentially associated with clinicians' preference for imaging were selected a priori, from patient characteristics and clinical assessment findings. A mixed-effect logistic regression model examined the associations between these factors and physiotherapists' preference for MRI. Results. Physiotherapists expressed a preference for MRI in 32% (196/607) of patients, of whom 22 did not have a clinical diagnosis of sciatica (radiculopathy). Factors associated with preference for MRI included; clinical diagnosis of sciatica (OR 4.23: 95% CI 2.29,7.81), greater than 3 months pain duration (OR 2.61: 95% CI 1.58,4.30), high pain intensity (OR 1.24: 95%CI 1.11,1.37), patient's low expectation of improvement (OR 2.40: 95% 1.50,3.83), physiotherapist's confidence in the diagnosis (OR 1.19: 95% CI 1.07,1.33) with greater confidence associated with higher probability of preference for MRI. Conclusion. A clinical diagnosis of sciatica and longer symptom duration were most strongly associated with physiotherapists' preference for MRI. Given current best practice guidelines, these appear to be justifiable reasons for wanting patients to have an MRI. Conflicts of interest: None. Funding. SE was supported through an NIHR internship linked to an NIHR Research Professorship awarded to NEF (RP-01-015). NEF is an NIHR Senior Investigator. KK is supported through a HEFCE Senior Clinical Lecturer award. The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the NIHR, NHS or the Department of Health