Immersive interactive virtual walking reduces neuropathic pain in spinal cord injury: findings from a preliminary investigation of feasibility and clinical efficacy

A scoping review on the role of virtual walking intervention in enhancing wellness

Virtual walking has the potential to be an adjunct to traditional physical therapy. This scoping review aims to synthesize evidence on the characteristics, effectiveness, feasibility, and neurological mechanism of virtual walking interventions on health-related outcomes. Articles in English were retrieved from twelve databases (January 2014-October 2024). Thirteen interventional studies were included, focusing on three types of virtual walking: passive observing moving (71.4%), arm swing locomotion (21.5%), and foot tracking locomotion (7.1%). Most studies (84.6%) involved individuals with spinal cord injuries, while the remaining studies focused on lower back pain (7.7%) and lower limb pain (7.7%). Over 70% of studies lasted 11-20 min, 1-5 weekly sessions for 10-14 days. Statistically significant findings included pain reduction (84.6%), improved physical function (mobility and muscle strength), and reduced depression. Mild adverse effects (fatigue and dizziness) were transient. Neurological evidence indicates somatosensory cortex activation during virtual walking, possibly linked to neuropathic pain.

Effects of virtual reality on psychological distress in individuals with spinal cord injury: A systematic review

CONTEXT

Psychological distress is common among individuals with spinal cord injury (SCI). Virtual reality (VR) is an innovative technology used in treating patients with neurological disorders.

OBJECTIVES

This systematic review aims to explore the effects of VR on psychological distress in individuals with SCI.

METHODS

A comprehensive search was conducted in "PubMed, PEDro, REHABDATA, MEDLINE, SCOPUS, EMBASE, CINAHL, and Web of Science" databases from inception to November 1, 2024. Studies included individuals with SCI with various levels or completeness of injury, administrated VR intervention independently or in combination with other treatments, compared with passive, active, or no control interventions, and evaluated psychological distress were included. The "Physiotherapy Evidence Database (PEDro)" scale was used to assess the risk of bias in eligible studies.

RESULTS

Eight out of 405 studies were included in this systematic review. A total of 159 individuals with SCI (male 67%, mean age 49.6 years) were included in this systematic review. The results were synthesized using a a descriptive analysis. The included studies showed that administrating multiple sessions of VR independently or in combination with cognitive training or conventional physiotherapy reduces depression, anxiety, and stress in individuals with SCI.

CONCLUSIONS

VR has potential immediate benefits on psychological distress in individuals with SCI. SCI individuals with various severity, level, and duration of injury might benefit from the intervention. However, these findings should be interpreted with caution. Further studies are strongly recommended to understand the long-term effects of VR, determine the most effective treatment protocol, and identify which SCI populations are more likely to benefit from the intervention.

Virtual Reality Interventions and Chronic Pain: Scoping Review

BACKGROUND

Virtual reality (VR) interventions have demonstrated efficacy for more than a decade for mood and anxiety disorders and emerging evidence suggests they can reduce pain symptoms in both acute and chronic pain. More recently, these interventions have abounded within the commercial and academic sectors, immersing participants within a virtual environment to confer health benefits to users. VR immersion can facilitate the delivery of health interventions by isolating participants from distractors and stressors in a therapeutic environment. While recent studies of VR interventions have exploded, they are not uniform in approach or device type, limiting generalizability. Recent scoping reviews on VR and chronic pain have focused on specific diseases or limited inquiries to specific interventions or study types.

OBJECTIVE

We conducted a scoping review to generate new knowledge about the sum total of VR studies on chronic pain with specific emphasis on the methods and results of each study, including (1) the type of interventions, (2) outcomes chosen, (3) samples studied, and (4) data generated.

METHODS

A scoping review was performed on the literature on VR and chronic pain to describe themes associated with the literature to date and identify important gaps and unanswered questions to guide future research. CINAHL [EBSCO] (Cumulative Index to Nursing and Allied Health Literature) and PubMed were queried for the terms "virtual reality" and "pain," providing studies of chronic pain adult participants using VR delivered through headset displays. We included English-language manuscripts that had at least one VR intervention arm with adults with chronic pain. For this analysis, we only included VR interventions that were immersive (ie, using headsets). Non-study reports, studies with no specific chronic pain component, those not involving adults, and those using VR as part of a comprehensive rehabilitation program were excluded. A descriptive analytical method was used to extract data, compare studies, and contextualize the presented outcomes. Articles were categorized into several themes including the type of intervention, outcomes chosen, participant characteristics, degree to which immersion was achieved, and adverse effect monitoring and reporting.

RESULTS

A total of 36 articles were included in our analysis. We summarize the literature using 5 themes: (1) heterogeneity of chronic pain types, (2) highly variable intervention types, (3) highly variable secondary and exploratory outcomes, (4) immersion was highly variable between studies and not systemically explored in many articles, and (5) side effect monitoring was limited.

CONCLUSIONS

The literature on VR in chronic pain is highly variable and lacks theoretical rigor. While there is emerging evidence that supports VR use in a wide variety of health conditions including chronic pain, future research should focus on producing theoretically rigorous work that focuses on mechanisms and that systematically assesses side effects to generate robust generalizable knowledge.

Psychological outcomes of extended reality interventions in spinal cord injury rehabilitation: a systematic scoping review

STUDY DESIGN

Systematic scoping review.

OBJECTIVES

Extended reality (XR) is becoming a recognisable tool for assisting in spinal cord injury (SCI) rehabilitation. While the success of XR mediated interventions is often evaluated based on improvements in physical and functional performance, the present systematic scoping review aimed to identify and synthesize evidence on reported psychological outcomes of XR interventions in SCI rehabilitation. In doing so, we aimed to contribute towards an adaptation of XR that is meaningful for individuals living with SCI.

METHODS

Seven bibliometric databases were systematically searched. Included studies needed to be peer-reviewed, test structured and targeted XR interventions in an adult (≥ 16 years) SCI population, and assess any psychological construct. Individual double-screening against a pre-defined eligibility criteria was performed. Data from the included studies were extracted, tabulated, and analysed.

RESULTS

A total of 964 unique studies were initially identified. 13 studies were included in the analysis. The psychological outcomes most frequently quantified were depression, self-esteem, and anxiety. Among other things, qualitative evidence suggests VR-based interventions provided enjoyment, relaxation, and a source of positive distraction.

CONCLUSION

Immersive XR interventions in SCI rehabilitation have been positively evaluated, both qualitatively and quantitatively, based on the psychological outcomes of participants. While further research is needed, we find immersive XR to be an emerging treatment option with promise for maintaining and improving psychological health during SCI rehabilitation.

Neuropathic Pain Induced by Spinal Cord Injury from the Glia Perspective and Its Treatment

Regional neuropathic pain syndromes above, at, or below the site of spinal damage arise after spinal cord injury (SCI) and are believed to entail distinct pathways; nevertheless, they may share shared defective glial systems. Neuropathic pain after SCI is caused by glial cells, ectopic firing of neurons endings and their intra- and extracellular signaling mechanisms. One such mechanism occurs when stimuli that were previously non-noxious become so after the injury. This will exhibit a symptom of allodynia. Another mechanism is the release of substances by glia, which keeps the sensitivity of dorsal horn neurons even in regions distant from the site of injury. Here, we review, the models and identifications of SCI-induced neuropathic pain (SCI-NP), the mechanisms of SCI-NP related to glia, and the treatments of SCI-NP.

Progress in treatment of pathological neuropathic pain after spinal cord injury

Pathological neuropathic pain is a common complication following spinal cord injury. Due to its high incidence, prolonged duration, tenacity, and limited therapeutic efficacy, it has garnered increasing attention from both basic researchers and clinicians. The pathogenesis of neuropathic pain after spinal cord injury is multifaceted, involving factors such as structural and functional alterations of the central nervous system, pain signal transduction, and inflammatory effects, posing significant challenges to clinical management. Currently, drugs commonly employed in treating spinal cord injury induced neuropathic pain include analgesics, anticonvulsants, antidepressants, and antiepileptics. However, a subset of patients often experiences suboptimal therapeutic responses or severe adverse reactions. Therefore, emerging treatments are emphasizing a combination of pharmacological and non-pharmacological approaches to enhance neuropathic pain management. We provide a comprehensive review of past literature, which aims to aim both the mechanisms and clinical interventions for pathological neuropathic pain following spinal cord injury, offering novel insights for basic science research and clinical practice in spinal cord injury treatment.

Psychological, physical and complementary therapies for the management of neuropathic pain

This chapter aims to explain and evaluate the evidence for psychological, physical and complementary therapies as part of a holistic plan for managing neuropathic pain. Psychological therapies refer to interventions targeting mental health, while physical therapies refer to interventions designed to target movement and functional ability, and complementary therapies are those that attempt to target key mechanisms of change to alter brain and body functioning, or thought processes related to the experience of pain. Each therapeutic modality is discussed to narratively report on the evidence and provide implications for clinicians. Where evidence was unavailable for neuropathic pain populations, evidence from chronic pain populations more broadly was considered. Although promising, there is a lack of high-quality evidence investigating the benefits and safety of psychological, physical and complementary therapies for the management of neuropathic pain. The low certainty evidence and lack of evidence across different neuropathic pain conditions impacts the ability to make recommendations for clinical practice. However, there are several potential areas for future research. Psychological therapies that focus on the underlying mechanisms related to emotion regulation may improve mood and pain, while cognitive and behavioural based approaches may improve psychological comorbidities such as anxiety and depression. Physical therapies involving physical activity and exercise, education, and graded motor imagery may improve functioning and reduce pain. Finally, complementary therapies including electroencephalography neurofeedback, acupuncture, virtual reality, hypnosis and transcutaneous electrical nerve stimulation may provide promising reductions in pain. There is a clear need for further high-quality trials to evaluate the benefits and safety of psychological, physical and complementary therapies to guide the management of neuropathic pain.

Virtual Reality as a Therapeutic Tool in Spinal Cord Injury Rehabilitation: A Comprehensive Evaluation and Systematic Review

Introduction: The spinal rehabilitation process plays a crucial role in SCI patients' lives, and recent developments in VR have the potential to efficiently engage SCI patients in therapeutic activities and promote neuroplasticity. Objective: The primary objective of this study is to assess a complete review of the extended impacts of VR-assisted training on spine rehabilitation in SCI patients. Methods: This systematic review was conducted according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) through a single database search in PubMed/Medline between the dates 1 January 2010 and 1 February 2024. MESH terms and keywords were combined in the following search strategy: (Augmented Reality OR VR OR Virtual Reality) AND (Spine OR Spinal) AND Rehabilitation. Included articles were written in English, involved adults with SCI, included an intervention with VR, AR, or any mixed reality system, and assessed changes in outcomes after the intervention. Results: The search produced 257 articles, and 46 of them were allocated for data extraction to evaluate 652 patients. Both when VR training was analyzed and reviewed separately, and when compared to traditional training, the findings exhibited predominantly promising outcomes, reflecting a favorable trend in the study. VR technologies were used in different settings and customizations, and the medium total time of VR training among the studies was 60.46 h per patient. Conclusions: This auspicious outcome of the study further motivates the intervention of VR and AR in the rehabilitation of SCI patients along with ameliorating their overall holistic well-being.

Exoskeleton Training for Spinal Cord Injury Neuropathic Pain (ExSCIP): Protocol for a Phase 2 Feasibility Randomised Trial

Background

Following Spinal Cord Injury (SCI), 53% of people develop neuropathic pain (NP). NP can be more debilitating than other consequences of SCI, and a persistent health issue. Pharmacotherapies are commonly recommended for NP management in SCI, although severe pain often remains refractory to these treatments in many sufferers. Furthermore, poor medication adherence exists, stemming from unacceptable side-effects and fear of dependency.Sensorimotor stimulation using active walking with robotic assistance has not been well studied in NP after SCI, despite convincing locomotor-based pre-clinical studies, identifying prevention and reversal of NP.Our primary aim is to assess the impact of exoskeleton-based walking on NP intensity and interference after SCI and examine feasibility outcomes for progression to a definitive trial.

Methods

This is a phase 2 single-blinded, randomised feasibility study. It will test the feasibility and acceptability of exoskeleton-based walking 3 times per week for 12 weeks (intervention), as a mechanistic-based intervention for NP after SCI. The comparator will be an equally dosed, blended relaxation programme devoid of motor imagery prompts. 40 participants with moderate-to-severe NP post SCI will be recruited and randomised to intervention and comparator groups.The primary outcomes are feasibility outcomes for progression to definitive trial which include recruitment and retention rates, adverse events and acceptability of the intervention.Secondary outcomes explore changes in NP intensity and interference as measured by the International Spinal Cord Injury Pain Basic Data Set 3.0 (ISCIPBDS) at baseline, post-intervention (week 13) and at 6-month follow-up.

Conclusions

There is a need to explore non-pharmacological management of NP after SCI. The findings of this feasibility trial will inform the development of a future multicentre, international RCT.

Trial Registration

NCT06463418, 08/07/2024, https://clinicaltrials.gov/study/NCT06463418.

Virtual Reality in Acute and Chronic Pain Medicine: An Updated Review

PURPOSE OF REVIEW

This review critically analyzes the recent literature on virtual reality's (VR) use in acute and chronic pain management, offering insights into its efficacy, applications, and limitations.

RECENT FINDINGS

Recent studies, including meta-analyses and randomized controlled trials, have demonstrated VR's effectiveness in reducing pain intensity in various acute pain scenarios, such as procedural/acute pain and in chronic pain conditions. The role of factors such as immersion and presence in enhancing VR's efficacy has been emphasized. Further benefits have been identified in the use of VR for assessment as well as symptom gathering through conversational avatars. However, studies are limited, and strong conclusions will require further investigation. VR is emerging as a promising non-pharmacological intervention in pain management for acute and chronic pain. However, its long-term efficacy, particularly in chronic pain management, remains an area requiring further research. Key findings highlight that VR programs vary in efficacy depending on the specificity of the origin of pain.

Virtual walking therapy in neuropathic spinal cord injury pain: a feasibility study

STUDY DESIGN

A feasibility study.

OBJECTIVES

Chronic neuropathic pain is a prevalent comorbidity in patients with spinal cord injury (SCI), and current medical treatments remain unsatisfactory. New developments as virtual walking are emerging which has been established and further developed at our centre. This study aims to investigate the feasibility of our virtual walking setup in a small group of SCI patients.

SETTING

The study was conducted at the Swiss Paraplegic Centre in Nottwil, Switzerland.

METHODS

Four patients aged 22 to 60 years were observed during and after therapy. Three had complete paraplegia (levels Th4-Th8) with neuropathic at- and below-level pain, while one had incomplete paraplegia (Th10) with at-level pain. The primary outcome measured was satisfaction with acceptance of and adherence to virtual walking therapy, alongside suggestions for therapy improvements. Additionally, patients kept a pain diary and pain drawings to measure the extent of pain distribution and intensity before and after therapy. Therapy schedules included either two sessions per week for five weeks or five sessions per week for two weeks.

RESULTS

There was a sound satisfaction and good acceptance amongst participants. Support, duration, and number of sessions were perceived well and acceptable. Pain as a secondary outcome did not change during or after therapy in all but one patient which improved in pain intensity, pain quality as well as pain distribution.

CONCLUSION

Results suggest that our virtual walking setting is a feasible tool that should be further studied in patients with SCI-related chronic neuropathic pain.

Telehealth and Virtual Reality Technologies in Chronic Pain Management: A Narrative Review

PURPOSE OF REVIEW

This review provides medical practitioners with an overview of the present and emergent roles of telehealth and associated virtual reality (VR) applications in chronic pain (CP) management, particularly in the post-COVID-19 healthcare landscape.

RECENT FINDINGS

Accumulated evidence points to the efficacy of now well-established telehealth modalities, such as videoconferencing, short messaging service (SMS), and mobile health (mHealth) applications in complementing remote CP care. More recently, and although still in early phases of clinical implementation, a wide range of VR-based interventions have demonstrated potential for improving the asynchronous remote management of CP. Additionally, VR-associated technologies at the leading edge of science and engineering, such as VR-assisted biofeedback, haptic technology, high-definition three-dimensional (HD3D) conferencing, VR-enabled interactions in a Metaverse, and the use of wearable monitoring devices, herald a new era for remote, synchronous patient-physician interactions. These advancements hold the potential to facilitate remote physical examinations, personalized remote care, and innovative interventions such as ultra-realistic biofeedback. Despite the promise of VR-associated technologies, several limitations remain, including the paucity of robust long-term effectiveness data, heterogeneity of reported pain-related outcomes, challenges with scalability and insurance coverage, and demographic-specific barriers to patient acceptability. Future research efforts should be directed toward mitigating these limitations to facilitate the integration of telehealth-associated VR into the conventional management of CP. Despite ongoing barriers to widespread adoption, recent evidence suggests that VR-based interventions hold an increasing potential to complement and enhance the remote delivery of CP care.

Central neuropathic pain

Central neuropathic pain arises from a lesion or disease of the central somatosensory nervous system such as brain injury, spinal cord injury, stroke, multiple sclerosis or related neuroinflammatory conditions. The incidence of central neuropathic pain differs based on its underlying cause. Individuals with spinal cord injury are at the highest risk; however, central post-stroke pain is the most prevalent form of central neuropathic pain worldwide. The mechanisms that underlie central neuropathic pain are not fully understood, but the pathophysiology likely involves intricate interactions and maladaptive plasticity within spinal circuits and brain circuits associated with nociception and antinociception coupled with neuronal hyperexcitability. Modulation of neuronal activity, neuron-glia and neuro-immune interactions and targeting pain-related alterations in brain connectivity, represent potential therapeutic approaches. Current evidence-based pharmacological treatments include antidepressants and gabapentinoids as first-line options. Non-pharmacological pain management options include self-management strategies, exercise and neuromodulation. A comprehensive pain history and clinical examination form the foundation of central neuropathic pain classification, identification of potential risk factors and stratification of patients for clinical trials. Advanced neurophysiological and neuroimaging techniques hold promise to improve the understanding of mechanisms that underlie central neuropathic pain and as predictive biomarkers of treatment outcome.

Cortical Mechanisms Underlying Immersive Interactive Virtual Walking Treatment for Amelioration of Neuropathic Pain after Spinal Cord Injury: Findings from a Preliminary Investigation of Thalamic Inhibitory Function

BACKGROUND

Neuropathic pain following spinal cord injury (SCI) affects approximately 60% of individuals with SCI. Effective pharmacological and non-pharmacological treatments remain elusive. We recently demonstrated that our immersive virtual reality walking intervention (VRWalk) may be effective for SCI NP. Additionally, we found that SCI NP may result from a decrease in thalamic γ-aminobutyric-acid (GABA), which disturbs central sensorimotor processing.

OBJECTIVE

While we identified GABAergic changes associated with SCI NP, a critical outstanding question is whether a decrease in SCI NP generated by our VRWalk intervention causes GABA content to rise.

METHOD

A subset of participants (n = 7) of our VRWalk trial underwent magnetic resonance spectroscopy pre- and post-VRWalk intervention to determine if the decrease in SCI NP is associated with an increase in thalamic GABA.

RESULTS

The findings revealed a significant increase in thalamic GABA content from pre- to post-VRWalk treatment.

CONCLUSION

While the current findings are preliminary and should be interpreted with caution, pre- to post-VRWalk reductions in SCI NP may be mediated by pre- to post-treatment increases in thalamic GABA by targeting and normalizing maladaptive sensorimotor cortex reorganization. Understanding the underlying mechanisms of pain recovery can serve to validate the efficacy of home-based VR walking treatment as a means of managing pain following SCI. Neuromodulatory interventions aimed at increasing thalamic inhibitory function may provide more effective pain relief than currently available treatments.

Potential novel therapeutic strategies for neuropathic pain

Purpose

To explore the potential therapeutic strategies of different types of neuropathic pain (NP) and to summarize the cutting-edge novel approaches for NP treatment based on the clinical trials registered on ClinicalTrials.gov.

Methods

The relevant clinical trials were searched using ClinicalTrials.gov Dec 08, 2022. NP is defined as a painful condition caused by neurological lesions or diseases. All data were obtained and reviewed by the investigators to confirm whether they were related to the current topic.

Results

A total of 914 trials were included in this study. They were divided into painful diabetic neuropathy (PDN), postherpetic neuralgia (PHN), sciatica (SC), peripheral nerve injury-related NP (PNI), trigeminal neuralgia (TN), chemotherapy-induced NP (CINP), general peripheral NP (GPNP) and spinal cord injury NP (SCI-NP). Potential novel therapeutic strategies, such as novel drug targets and physical means, were discussed for each type of NP.

Conclusion

NP treatment is mainly dominated by drug therapy, and physical means have become increasingly popular. It is worth noting that novel drug targets, new implications of conventional medicine, and novel physical means can serve as promising strategies for the treatment of NP. However, more attention needs to be paid to the challenges of translating research findings into clinical practice.

Use and efficacy of virtual, augmented, or mixed reality technology for chronic pain: a systematic review

Aim: Characterize use and efficacy/effectiveness of virtual, augmented, or mixed reality (VR/AR/MR) technology as non-pharmacological therapy for chronic pain. Methods: Systematic search of 12 databases to identify empirical studies, of individuals who experience chronic pain or illness involving chronic pain, published between 1990 and 2021. JBI Critical Appraisal Checklists assessed study bias and a narrative synthesis was provided. Results: 46 studies, investigating a total of 1456 participants and including 19 randomized controlled trials (RCT), were reviewed. VR/AR/MR was associated with improved pain-related outcomes in 78% of the RCTs. Conclusion: While most studies showed effects immediately or up to one month post treatment, RCTs are needed to further evaluate VR/AR/MR, establish long-term benefits, and assess accessibility, especially among individuals who experience pain management disparities.

Effects of Virtual Reality-Based Aerobic Exercise on Perceptions of Pain and Fatigue in Individuals with Spinal Cord Injury

Virtual reality (VR) has become an effective alternative to promote exercise. However, limited studies have investigated the effect of VR on pain and fatigue in individuals with spinal cord injury (SCI). Objective: The purpose of this study was to investigate the effects of using VR during exercise on pain and fatigue in individuals with SCI. This study employed a concurrent nested mixed-methods design. Materials and Methods: Eleven individuals with SCI completed a 6-minute exercise test using arm ergometry with and without VR. Pain and fatigue questionnaire data were collected using Pain Self Efficacy Questionnaire, the Fatigue Severity Scale, and the Fatigue Assessment Scale. Qualitative data were collected after the VR session. Results: Participants experienced less pain and fatigue during VR exercise than during non-VR exercise. Qualitative data were consistent with the questionnaire results. Conclusion: Clinicians should consider the use of VR in reducing pain and fatigue.