Epidural Injection Research Articles

Effects of dexamethasone combined with vitamin B12 on percutaneous endoscopic interlaminar discectomy early outcomes: a randomized controlled trial

BackgroundResidual low back and leg pain can occur after percutaneous endoscopic interlaminar discectomy (PEID) and compromise early surgical outcomes. This study aimed to determine the efficacy of combining dexamethasone with vitamin B12 (VB12) via epidural injection in improving the symptoms of low back and leg pain after PEID, and the underlying mechanism of action.MethodsPatients who underwent PEID for lumbar disc herniation (LDH) were enrolled and randomly assigned to the single surgery (SS) group, where disc removal was performed via PEID alone, or the combined treatment (CT) group, which received epidural injections of dexamethasone and VB12 alongside surgery. The outcome measures were the Visual Analog Scale (VAS), Japanese Orthopaedic Association (JOA) score, Oswestry Disability Index (ODI), serum inflammatory factor expression, adverse surgical events, duration of postoperative hospitalization, and modified MacNab criteria.ResultsCompared with the SS group, the CT group exhibited lower VAS scores for low back and leg pain at 1, 3, and 7 days post-surgery (P < 0.05). JOA and ODI scores were significantly improved in the CT group than in the SS group 7 days post-surgery (P < 0.05); however, no significant differences were observed at other time points. Serum inflammatory factors were lower in the CT group than in the SS group 3 days post-surgery (P < 0.05). The duration of postoperative hospitalization was shorter in the CT group (P < 0.05). Both groups had similar good outcomes (89.3% vs. 92.2%, P = 0.945).ConclusionsEpidural injection of dexamethasone and VB12 effectively reduces early postoperative low back and leg pain, lowers postoperative inflammatory factor expression, and improves early PEID outcomes. Its clinical adoption merits consideration.Trial registrationThis trial was registered with the China Clinical Trial Registration Center (Identifier: ChiCTR2400088854).

Why are local epidural glucocorticoid injections associated with fractures? Drug, disease, or both?

Why are local epidural glucocorticoid injections associated with fractures? Drug, disease, or both?

Effectiveness of Transforaminal Epidural Steroid Injection and Lumbar Traction in Lumbar Radiculopathy Due to Intervertebral Disc Herniation: A Comparative Study

Background: Lumbar radiculopathy, commonly caused by intervertebral disc herniation, leads to severe pain and disability. Various non-surgical treatments, including Transforaminal Epidural Steroid Injection (TESI) and lumbar traction, are employed to alleviate pain and improve functionality. Objective: The study aimed to compare the effectiveness of TESI and lumbar traction in managing lumbar radiculopathy. Methods: This study was designed as a prospective, randomized, comparative trial conducted over 12 months at a tertiary care center, involving 100 patients diagnosed with lumbar radiculopathy due to intervertebral disc herniation (IDH). Eligible patients, aged 18 to 65 years with MRI-confirmed disc herniation causing radiculopathy, were randomly assigned to either the TESI group (n=50) or the lumbar traction group (n=50). Exclusion criteria included patients with prior lumbar surgery, spinal infections, or tumors. The TESI group received a single transforaminal epidural steroid injection under fluoroscopic guidance, while the lumbar traction group underwent mechanical traction therapy for 30 minutes per session, three times a week for six weeks. Outcome measures included pain intensity, assessed using the Visual Analog Scale (VAS) at baseline, two weeks, and six months post-intervention, functional outcome using the Oswestry Disability Index (ODI) at the same time points, and patient satisfaction using a five-point Likert scale at six months. Statistical analyses were conducted using SPSS software, with significance set at p-values &lt;0.05. Results: The results of this study demonstrated that both the TESI and lumbar traction groups experienced significant improvements in pain and functional outcomes; however, the TESI group showed more pronounced results. In terms of pain reduction, the TESI group’s mean VAS score decreased from 7.5 at baseline to 3.2 at two weeks and 2.8 at six months, while the lumbar traction group saw a decrease from 7.6 to 5.1 at two ........

Diagnosis and management of infections related to spinal pain interventions

Although relatively rare, infections related to spinal pain interventions pose significant risks with an increase in the frequency of these procedures. This review investigates the incidence, risk factors, and management of infections following spinal pain interventions, such as epidural steroid injections, nucleoplasty, and facet joint injections. Most of the existing literature comprises case reports and retrospective studies with limited prospective research, owing to the nature of these infections. Our analysis revealed that while the overall infection rate is low, potential complications, such as epidural abscesses and spondylodiscitis, can be severe and life-threatening. The risk factors include advanced age, diabetes, immunosuppression, and multiple spinal procedures. Early diagnosis and timely intervention are critical to prevent long-term morbidity. These findings emphasize the importance of developing standardized diagnostic algorithms and treatment guidelines to support clinicians in managing these infections effectively. Future research should focus on large-scale studies to understand the impact of these infections better and refine clinical management strategies.

Erector Spinae Plane Block for Chronic Lumbosacral Pain: A Case Report

Chronic low back pain is a prevalent and debilitating condition that often resists traditional management strategies such as physical therapy, pharmacotherapy, and interventional procedures. The erector spinae plane (ESP) block, a relatively new regional anesthesia technique, has shown promise in managing various types of pain, including chronic conditions. This case report details the use of the ESP block in a male patient in his late 60’s with chronic low back pain unresponsive to conventional treatments, including acetaminophen, muscle relaxants, gabapentin, epidural steroid injections, diagnostic medial branch blocks, and sacroiliac joint injections. Given the refractory nature of his pain, a right-sided lumbar ESP block was performed under fluoroscopic guidance. This case highlights the potential of the ESP block as an effective treatment for chronic lumbar pain, particularly in patients who have not responded to other interventional modalities. The safety profile of the ESP block, coupled with its efficacy in this case, supports its consideration as a viable option in chronic pain management. Further studies and clinical experience will be essential in defining its role and establishing standardized protocols for its use in chronic pain settings.

Increased Risk of Osteoporotic Vertebral Compression Fractures Following Epidural Steroid Injections in Patients with Lumbar Degenerative Disease: A Retrospective Cohort Study

Increased Risk of Osteoporotic Vertebral Compression Fractures Following Epidural Steroid Injections in Patients with Lumbar Degenerative Disease: A Retrospective Cohort Study

Clinical Evaluation of Transforaminal Epidural Steroid Injection and Facet Block in Managing Degenerative Chronic Low Back Pain in Orthopaedic Patient

Clinical Evaluation of Transforaminal Epidural Steroid Injection and Facet Block in Managing Degenerative Chronic Low Back Pain in Orthopaedic Patient

Effectiveness of Lumbar Transforaminal Epidural Steroid Injection in Patients with Radiculopathy - A Prospective Observational Study

Background: Lumbar radiculopathy is a common condition characterized by pain radiating from the lower back to the lower limb, with high prevalence rates in the Indian population. Objectives: To evaluate the effectiveness of lumbar transforaminal epidural steroid injections in patients with radiculopathy. Materials and Method: The present study included 31 patients with intervertebral disc prolapse and radiculopathy confirmed by MRI. Patients received lumbar transforaminal epidural steroid injection and were assessed at baseline, immediately after, and at 6, 12, and 24 weeks using Numerical Rating Scale (NRS), Oswestry Disability Index (ODI), and Patient Satisfaction Questionnaire-18 (PSQ-18). A statistically analysis was carried using the Friedman test and Post-hoc Wilcoxon signed rank test with p&lt;0.005 as significant value. Results: Numerical Rating Scale (NRS) scores decreased substantially from 6.81 to 3.45 immediately after the procedure and remained low at 6-12 weeks (3.42-3.74), with a slight increase at 24 weeks (4.23). Similarly, Oswestry Disability Index (ODI) scores improved notably from 44.19 to 29.16 immediately after the procedure and remained improved at 6-24 weeks (30.00-33.48). Patient Satisfaction Questionnaire-18 (PSQ-18), showed a brief improvement post-procedure (4.09) but returned to near baseline levels (3.97-4.01) over the long-term follow-up period. These findings were statistically significant, with p-values of 0.000 for NRS, ODI, and PSQ-18 scores over follow-ups. Conclusion: Transforaminal epidural steroid injection is a safe and effective treatment for lumbar radiculopathy, providing short-term pain relief and functional improvement. However, long-term efficacy remains unclear, highlighting the need for further large-scale, long-term research to optimize treatment outcomes.

Factfinders for patient safety: Epidural steroid injection in patients with lumbar spinal stenosis

This FactFinder presents a brief summary of the evidence suggesting that epidural steroid injections can be safely performed even in the setting of severe, multilevel lumbar spinal stenosis.

Epidural injection of hydromorphone for postoperative pain after episiotomy: a randomized controlled trial.

Perineal incision resulting in post-partum pain and impact on puerperal life was the focus of our study. We recruited postpartum mothers who had undergone vaginal delivery to receive labor analgesia and episiotomy with an epidural injection of 0.5mg hydromorphone to assess the therapeutic effects of postpartum analgesia. The participants were randomly allocated into two groups: the control group (Group NS) received an epidural injection of an equal amount of saline, while the study group (Group HY) received an epidural injection of 0.5mg hydromorphone. We collected relevant data from electronic medical records to compare the differences between the two groups. The intervention group demonstrated lower pain scores at 4, 8, 12, 16, and 24h compared to the control group (p < 0.001). Additionally, a higher number of patients in the control group required pain medication (7 (15.9%) compared to 2 (4.7%)). The time to first analgesia request in group NS was earlier than that in group HY (8.94 ± 1.27h compared to 16.96 ± 3.38h). The study group experienced higher rates of vomiting (P = 0.002) and itching (P < 0.001). However, there were no differences between the two groups in terms of urinary retention, dyskinesia, respiratory depression, dizziness, or neonatal feeding. The epidural injection of 0.5mg hydromorphone proved to be effective in alleviating pain caused by maternal episiotomy and did not negatively affect neonatal feeding.Clinical trial registration: http://www.chictr.org.cn/usercenter.aspx identifier: ChiCTR2200064687.

Comparable Overall Risk of Neurologic Adverse Events Following Cervicothoracic Interlaminar and Transforaminal Epidural Injections: An Analysis of 1.29 Million Patients.

Retrospective cohort study. To characterize the incidence and odds of neurologic adverse events following interlaminar (IL) and transforaminal (TF) cervicothoracic epidural spinal injections (CESI). CESI may be considered in the management of various cervical pathology. Adverse events, although rare, can be devastating and have been reported following both IL and TF injections. The literature is mixed with regard to the risk-profile of these two types of CESI, but is largely limited to case reports, single centered studies, and literature reviews, which may incompletely characterize the relative risk of these injections at a national level. All adult patients undergoing IL and TF-CESI were identified from a large, national, multi-insurance database. The incidence of any post-injection neurologic complication was reported per 1,000 patients. The odds of specific neurologic adverse events occurring within 48-hours following TF-CESI, relative to IL-CESI, were compared by multivariable logistic regression controlling for age, sex, and Elixhauser comorbidity index (ECI). A total of 1,073,215 IL-CESI patients and 220,597 TF-CESI patients were identified. The overall incidence of any neurologic complication following IL and TF-CESI occurred at a rate of 4.15 and 4.56 per 1,000 patients, respectively (P=0.889). TF-CESI was associated with higher odds ratio (OR) of nerve root injury (OR 1.69, P<0.001), but lower odds of epidural hematoma (OR 0.60, P=0.040), relative to IL-CESI. Conversely, no other neurologic adverse events were statistically different between approaches (P>0.05 for all). Following IL and TF-CESI, adverse events are relatively rare but not absent. Although the odds of the majority of individual neurologic adverse events were found to be similar, both approaches were independently associated with specific complications. Providers should therefore recognize that, at the national level, one CESI approach may not be universally associated with a lower risk of complications.

COMPARING THE CLINICAL OUTCOMES OF LUMBAR TRANSFORAMINAL VS INTERLAMINAR EPIDURAL STEROID INJECTIONS IN A REGISTRY COHORT

Epidural steroid injections are a safe and effective treatment for acute low back pain associated with radicular pain. Objective: The main objective of the study is to find the clinical outcomes of lumbar transforaminal vs interlaminar epidural steroid injections in a registry cohort. Methods: This prospective cohort study was carried out at Ghurki Trust Teaching Hospital, Lahore, over one year, from June 2023 to June 2024. A total of 185 patients were included in the study. Patients aged &gt;18 years and presented with symptoms of lumbar radiculopathy due to lumbar disc herniation, spinal stenosis, or degenerative disc disease were included in the study. Results: The mean age of the TFESI group was 45.6 ± 10.3 years, while the ILESI group had a mean age of 46.2 ± 9.8 years (p = 0.67). The gender distribution was also comparable, with 55 males and 37 females in the TFESI group, and 58 males and 35 females in the ILESI group (p = 0.78). Baseline pain intensity (VAS score) and disability (ODI score) were similar between the two groups, with no significant differences in VAS (7.6 ± 1.1 vs. 7.5 ± 1.2, p = 0.58) or ODI (52.4 ± 10.2 vs. 51.9 ± 9.9, p = 0.71). In the TFESI group, 52.2% of patients had lumbar disc herniation, compared to 49.5% in the ILESI group (p = 0.69). Lumbar spinal stenosis was diagnosed in 32.6% of patients in the TFESI group and 34.4% in the ILESI group (p = 0.81). Conclusion: It is concluded that both lumbar transforaminal epidural steroid injections (TFESI) and interlaminar epidural steroid injections (ILESI) are effective in the management of lumbar radiculopathy, leading to significant reductions in pain and improvements in functional outcomes.

Duration, Cost, and Escalation of Care Events for Physical Therapy Management of Low Back Pain in Service Members With Limb Loss.

Physical therapy (PT) is recommended as a primary treatment for low back pain (LBP), a common and impactful musculoskeletal condition after limb loss. The purpose of this brief report is to report the duration and cost of PT care, and subsequent escalation of care events, for LBP in service members with and without limb loss. This was a retrospective cohort, descriptive study. Service members with and without limb loss (matched) who received PT for LBP at a military treatment facility from 2015 to 2017 were included. Duration of PT care, number of PT visits, and escalation of care events 1 year after PT were extracted from medical records. Escalation of care events was identified as epidural steroid injections, referrals to specialists (e.g., orthopedists, spine surgeons, and pain management), and LBP-related hospitalizations.LBP-related PT encounters were queried; duration of care, number of visits, and cost of care were quantified. Escalation of care events, including opioid prescription, epidural steroid injections, specialty referrals, and hospitalizations, were identified up to 1 year after PT care. The average course of PT care for LBP was 12.9 more visits, 48.7 days longer, and $764.50 more expensive in service members with limb loss (n = 16) vs. those without limb loss (n = 48). Higher rates of opioid prescriptions and specialty referrals were observed in service members with limb loss. This study suggests that service members with limb loss and LBP received higher quantities and longer durations of PT than those without limb loss, yielding a nearly 4 times higher cost of PT.

8. Herpes zoster and post herpetic neuralgia.

Patients suffering from postherpetic neuralgia (PHN) report unilateral chronic pain in one or more dermatomes after an acute herpes zoster (HZ) infection. The incidence of acute HZ ranges between three and five patients per 1000 person-years. In one out of four patients, acute HZ-related pain will transition into PHN. PHN can be very disabling for patients and reduce quality of life. Additionally, the treatment of PHN is characterized by high failure rates. The aim of this review is to give an update on the previous practical guideline published in 2011 and revised in 2015 (published in 2019) and to provide an overview of current interventional treatment options for HZ infection and PHN. The literature on the diagnosis and treatment of HZ and PHN was systematically reviewed and summarized. The most important treatment for acute HZ-related pain is antiviral therapy within 72 h of symptom onset. Additional symptomatic treatment options are analgesic drugs according to the WHO pain ladder, tricyclic antidepressants (eg, nortriptyline), and antiepileptic drugs (eg, gabapentin). If pain is not sufficiently reduced, interventional treatment such as an epidural injection with local anesthetics and corticosteroids or pulsed radiofrequency of the dorsal root ganglion (DRG) are options. Treatment for PHN is preferably transdermal capsaicin, lidocaine, or oral drugs such as antidepressants or antiepileptics. Treatment of acute HZ-related pain especially PHN is challenging. Besides the conventional treatment for PHN, interventional management is considered a new treatment option. PRF of DRG seems to be the most promising interventional management.

Correlation of perfusion index change and analgesic efficacy in transforaminal steroid injection for lumbosacral pain, a prospective observational study

Background and Aims: Low back pain is a common problem and a major burden to society. Transforaminal epidural steroid injection is one of the most effective treatment modalities for back pain. We aim to objectively quantify pain relief of lumbosacral radicular pain post transforaminal steroid injection by correlating perfusion index (PI), reflecting real-time peripheral blood flow change at the site of monitoring, controlled by sympathetic system with Numerical rate score (NRS) and SLRT improvement. Material and Methods: A prospective observational study, conducted at K.S Hegde Medical Academy, Mangaluru, from June 2021 to June 2022 as a time-bound study. After IEC clearance (IEC certificate number) for the procedure and study, patients undergoing transforaminal epidural steroid injection for lumbosacral radicular pain were enrolled, excluding those meeting the exclusion criteria. PI change and NRS score improvement were noted at 0, 5, 10, 15, and 30 minutes along with pre and post-procedure SLRT. Results were analyzed. Results: A total of 40 patients were analyzed. PI change at 30 minutes was 2.113 from a baseline of 0.217. Median NRS of 5, improved to 0 and the mean SLRT of 45.17 to 61.45 at the end of 30 minutes. All changes are statistically significant with P (&lt;0.01). correlation between the PI change with NRS is mild (-0.312). Conclusion: PI change ratio shows an overall improvement in pain levels objectively, in a non-invasive, easy, and reliable way. Simultaneous improvement in both NRS and SLRT is clinically significant but cannot predict a correlated quantitative measure of pain relief.

Comparison of the Results of Combined Epidural Steroid Injection with Other Approaches in Lumbar Disc Herniation: A Retrospective Study

Background: Epidural steroid injection (ESI) is a minimally invasive treatment for lumbar disc herniation (LDH). It can be applied using a transforaminal (TFESI), interlaminar (ILESI), caudal (CESI), or combined (TFESI + CESI) approach. Aim: To compare the effectiveness of the three ESI approaches and the combined ESI application in reducing pain in patients with single or multi-level LDH. Methods: In this retrospective study, we included 239 patients diagnosed with LDH (who complained of low back pain for at least 3 months, had no neurological deficit or history of lumbar surgery, and were not contraindicated for ESI application) who received ESI and were followed up clinically for 2 years. Demographic (age, sex, body mass index (BMI)) and clinical data (duration of low back pain, visual analog scale (VAS) scores before and after ESI, and procedure-related information) were obtained from medical records. The VAS scores noted before treatment and at 3 months, 1 year, and 2 years after ESI were compared. Results: The post-treatment VAS scores of the combined ESI (TFESI + CESI) group were significantly lower than those of other approaches applied alone (P &lt; 0.05). Furthermore, VAS scores of the ILESI and CESI groups were significantly lower than those of the TFESI group at all three post-treatment time points (P &lt; 0.05). The patient’s age and BMI were weakly correlated with the post-treatment VAS scores. Conclusion: Combined ESI is more effective than any single-approach ESI in LDH and should be considered in suitable patients to increase treatment effectiveness.

Comparison of Clinical Effects and Physical Examination of Transforaminal and Caudal Steroid Injection With Targeted Catheter in Lumbar Radiculopathy: A Single-Blind Randomized Clinical Trial.

Transforaminal and caudal epidural injections are two methods of steroid injection in lumbar radiculopathy. Using a targeted catheter with the possibility of accessing the involved spinal roots and steroid administration selectively next to them during the caudal procedure may achieve the benefits of both transforaminal and caudal procedures. The aim of this study was to investigate the clinical effects and physical examinations of transforaminal steroid injection compared to caudal through a targeted catheter in lumbar radiculopathy. Fifty patients with lumbar radiculopathy candidates for epidural steroid injection were divided into transforaminal (T) and caudal (C) groups. Steroid injection under fluoroscopic guidance was performed in group T with the transforaminal method and in group C with the caudal method using a targeted catheter for each involved spinal nerve root. Pain intensity visual analog scale (VAS), Oswestry Disability Index (ODI), daily analgesic consumption, and physical examinations on four follow-ups (before injection, second week, first and third month) were evaluated. Pain score (VAS) and functional disability index (ODI) were similar in both groups, and there was no significant difference between the two groups (p>0.05). The positive Lasègue test was significantly higher in the caudal group than in the transforaminal group only in the third month (p<0.05). Other physical examinations in both groups did not have significant differences in all the follow-ups. Moreover, there was no difference in the amount of analgesic consumption in the two groups. No complications were observed in both groups. This study showed that transforaminal and caudal steroid injection (with a targeted catheter) in patients with lumbar radiculopathy had similar effects in controlling pain and improving functional disability of patients in the short term. Cases of recurrence of positive Lasègue test in physical examinations in the long term (third month) in the caudal group may indicate the preference of the transforaminal approach. Iranian Registry of Clinical Trials (IRCT) number: IRCT20111102007984N31.

ID: 307376 Comparing Efficacy and Safety of Dexamethasone, Methylprednisolone and Betamethasone in Lumbar Transforaminal Epidural Steroid Injections

ID: 307376 Comparing Efficacy and Safety of Dexamethasone, Methylprednisolone and Betamethasone in Lumbar Transforaminal Epidural Steroid Injections

Epidural Steroid Injections and Fracture Incidence Among Older Individuals with Radiculopathy.

Epidural steroid injections (ESIs) are a common and often effective treatment for radicular back pain. While oral glucocorticoids increase fracture incidence, little is known regarding fracture risk after ESI. This study investigated the incidence of fractures among individuals who received ESI and those who did not. We hypothesized that ESI exposure would be associated with an increased incidence of osteoporotic fracture and specifically vertebral fractures. Using 2005-2018 5% Medicare data, individuals with radicular pain who had ≥1 ESI and those who did not (non-ESI) were matched 1:10 by age, sex, and month of radicular pain diagnosis using exposure density sampling (EDS). Using a high-dimensional propensity score (HDPS) calculated based on the top 500 covariates across multiple data dimensions, ESI and non-ESI individuals were matched 1:1. Fractures were identified using validated ICD-9/10 diagnosis codes. Fracture incidence rate (IR) was calculated by group, and hazard ratios (HR) compared using Cox regression. 25 062 ESI patients and 221 735 non-ESI patients who met eligibility criteria were identified using EDS. Mean age was 76years (74% female). Among ESI-treated individuals, there were 2296 fractures, IR 49.1 (95% CI: 47.2-51.2) per 1000 person years. For non-ESI individuals, there were 11 917 fractures, IR 35.2 (95% CI: 34.5-35.8). Individuals who received ESI had a greater hazard of fracture at typical osteoporotic sites, HR 1.39 (95% CI 1.33-1.46) by EDS and 1.32 (1.12-1.54) by HDPS, and greater hazard of vertebral fracture, 1.54 (1.45-1.64) by EDS and 1.69 (1.38-2.07) by HDPS. Patients who received greater cumulative ESI doses (≥3 in 1year) had a higher risk of fractures within the first six months of follow-up. ESI exposure in older individuals is associated with an increased risk of fracture, suggesting there may be lasting detrimental skeletal effects of ESI. Further research into strategies to reduce fracture risk in this population is warranted.

External validation of the smartphone-based 6-minute walking test in patients with degenerative lumbar disorders undergoing epidural steroid injection

BackgroundThe 6-minute walking test (6WT) has previously shown to be reliable and valid outcome measure in patients undergoing surgery for degenerative lumbar disorders (DLD). A role of 6WT in conservatively treated patients undergoing epidural steroid injection (ESI) remains unclear. MethodsAbout 50 patients with DLD, scheduled for ESI were assessed by the smartphone-based 6WT and common paper-based patient-reported outcome measures (PROMs), including the Core Outcome Measures Index [COMI] back, Oswestry Disability Index (ODI) and Short Form Survey (SF-12). Pearson correlation coefficient (PCC) was used to define the relationship between 6WT and PROMs. Reliability of the 6WT was determined by intraclass correlation coefficient (ICC). Age- and sex-adjusted objective functional impairment (OFI) z-scores were calculated for each patient. ResultsA total of 50 patients (mean age 52 years, SD 13; 25% female), including 35 patients (70%) with lumbar disc herniation and 15 patients (30%) with lumbar spinal stenosis were included. The mean 6-minute walking distance (6WD) was 454.1 m (SD 89.1); the age- and sex-adjusted mean OFI z-score was −2.1 (SD 4.0). A total of 17 (34%) patients had mild, 8 (16%) moderate, and 4 (8%) severe OFI, while 21 (42%) had 6WT results within the normal population range (no OFI). The PCCs between the 6WD and VAS back pain were r=−0.30, ODI r=−0.43, COMI back r=−0.36, and PCS-12 r=0.51 (all p<.05). The ICC of the 6WT was β=0.92. ConclusionsThis external validation in a patient cohort with DLD, which was managed conservatively, confirms the reliability and content validity of the 6WT with similar PCCs with PROMs compared to the original surgical cohort. The results confirm the 6WT as a valid and useful tool for assessing OFI in patients with DLD and a broad range of functional restrictions in an outpatient setting.