Canadian Journal of Pain

Phantom Limbs and Phantom Limb Pain: Mechanisms, Clinical Challenges, and Emerging Therapies

Phantom limb phenomena, including painless and painful phantoms, have long intrigued clinicians and scientists, providing a window into the complex interplay between mind and body. Although highly prevalent, and despite decades of research, these experiences remain only partially understood. As one of the most severe, and poorly managed forms of chronic pain, phantom limb pain highlights critical gaps in both our understanding and therapeutic strategies. Treatments for phantom limb pain are recommended on a trial-and-error-basis and often yield little in the way of pain relief. Equally enigmatic are reports of "pain memories" localized to the missing limb and the phenomenon of telescoping — in which the phantom limb is felt to retract or shrink — both of which remain underexplored and poorly characterized in the published literature.

This Article Collection brings together cutting-edge research and clinical insights into the phenomena of phantom limbs and phantom limb pain from across disciplines, including neuroscience, rehabilitation, prosthetics, pain management, and psychology, to better understand these phenomena, to foster novel treatment approaches to PLP, and to improve patient outcomes.

The study of phantom limbs and phantom limb pain has important implications for psychology, neuroscience, pain management, and rehabilitation medicine. Phantom limb phenomena provide a window into the brain’s representation of the body, revealing how sensory and motor systems adapt — or fail to adapt — after limb loss. PLP is often poorly managed and poses a significant clinical challenge, affecting a large proportion of people with limb loss, and frequently leading to prolonged suffering, loneliness, and social isolation. Understanding the mechanisms underlying these experiences not only advances our knowledge of neuroplasticity and pain experience but also drives innovation in prosthetic design, virtual therapies, and neuromodulation techniques. As such, research in this area holds promise for improving quality of life for millions of individuals worldwide and for furthering our understanding of the mind-body connection.

This Article Collection in the Canadian Journal of Pain focuses on phantom limbs and phantom limb pain. Subtopics of interest include:

1. Neuroscience of Phantom Limbs
   • Peripheral and central neural correlates of phantom limb sensations
   • Cortical reorganization, neuroplasticity
2. Mechanisms Underlying Phantom Limbs and Phantom Limb Pain
   • Peripheral vs. central factors
   • Role of neuromas and spinal cord sensitization
   • Influence of psychological and emotional factors
3. Assessment and Diagnosis
   • Clinical tools for evaluating PLP
   • Neuroimaging techniques (fMRI, MEG, EEG)
   • AI and machine learning in PLP prediction and management
   • Patient-reported outcomes and qualitative assessments
4. Therapeutic Interventions
   • Mirror therapy and virtual reality approaches
   • Pharmacological treatments (e.g., NMDA receptor antagonists, opioids, psychedelics, etc.)
   • Neuromodulation techniques (e.g., TMS, DBS, spinal cord stimulation)
5. Prosthetics and Sensory Feedback
   • Advances in neuroprosthetics and brain-machine interfaces
   • Sensory substitution and feedback systems
   • Impact of prosthetic design on PL and PLP experience
6. Psychosocial Considerations
   • Psychological impact of limb loss and PLP
   • Cultural and individual differences in PLP experience
7. Epidemiology and Health Care Utilization
   • Prevalence, incidence, risk factors
   • Access to timely treatment, health care costs

Meet the Guest Advisors

Dr. Joel Katz is a world-recognized leader in the field of pain, known for his pioneering research in phantom limb pain, pre-emptive analgesia, and transitional pain medicine. He is a Distinguished Research Professor of Psychology at York University, Professor in the Department of Anesthesiology & Pain Medicine at the University of Toronto, and Research Lead of the Transitional Pain Service in the Department of Anesthesia and Pain Management at the Toronto General Hospital. He is the Editor-in-Chief of the Canadian Journal of Pain, the official journal of the Canadian Pain Society. Dr. Katz's program of research explores factors responsible for the transition of acute, time-limited pain to chronic, pathological pain after major surgery, including cancer-related procedures and transplant surgeries. He is evaluating interventions, such as specialized yoga programs, clinical hypnosis, and other mind-body treatments to reduce acute post-operative pain and prevent the transition to chronicity.

Dr. Sander Hitzig is the Program Research Director and a Senior Scientist at the St. John’s Rehab Research Program, Sunnybrook Research Institute. He holds the John C. and Sally Horsfall Eaton Chair in Rehabilitation Research, and is an Associate Professor, Affiliated Scientist at the University of Toronto’s Department of Occupational Science and Occupational Therapy (Temerty Faculty of Medicine; TFM), the Rehabilitation Sciences Institute (TFM), and the Dalla Lana School of Public Health. Dr. Hitzig’s program of research examines the long-term outcomes of persons aging with a disability and/or other vulnerabilities, which includes: (1) evaluating the impact of disability on health and quality of life; and (2) identifying factors that promote health and social wellbeing in the community. This includes lines of research on understanding factors that contribute to the maintenance and development of chronic pain in the spinal cord injury and limb loss populations.

Dr. Amanda Mayo is a Physiatrist at Sunnybrook HSC in Toronto, Canada specializing in limb loss rehabilitation, prosthetics and orthotics. Her research focuses on improving the continuum of limb loss care including pain management. She is an Associate Professor in the Department of Medicine at the University of Toronto.

Dr. Lora Appel is an Associate Professor of Health Informatics at York University and Adjunct Researcher at Michael Garron Hospital and Affiliate Scientist at University Health Network. She heads the Prescribing Virtual Reality (VRx) lab which co-designs with patients and caregivers pragmatic clinical trials that introduce and evaluate VR interventions for patients, caregivers and healthcare providers in different settings, ranging from acute-care hospitals, long-term care homes, to community centres and private residences.

Dr. Tim Salomons is an Associate Professor of Psychology at Queen’s University and a Clinical Psychologist. His work aims to understand how the brain and body interact to create the experience of pain, and why some people might be prone to develop pain while others are relatively resilient. He is especially interested in the biological mechanisms that underlie cognitive and affective responses to pain and how this knowledge might help us treat pain.

Disclosure Statement

Dr. Katz declares that they are Research Director of ManagingLife, Inc.