Pain Assessment in Children Undergoing Spine Surgery

Musculoskeletal (MSK) pain is one of the most common types of pain among children and adolescents. Recurring episodes of MSK pain conditions have a major impact on the daily lives. Children and adolescents with neuromuscular diseases are often unable to report the pain the patients experience because of intellectual and/or physical limitations. There is no reason to believe that pain is any less frequent or intense in these patients than in normally developing patients. Because of the elusive nature of pain in non-verbal children, therapeutic decisions are frequently based on vague proxy measures of pain and revert to a series of trials and errors. This project creates a unique opportunity to directly characterize and compare MSK and surgical pain subjectively in two different patient samples (verbal and non-verbal). The ultimate goal is to use this information to offer the highest quality of pain control in children with MSK conditions, and more specifically in children with limited communication skills unable to communicate their distress associated with the surgical procedural.

Improvement in the assessment techniques, to enable better pain management in children with intellectual and developmental disabilities who are unable to describe the intensity of the postsurgical pain, is a cornerstone of our research program. This research project will elucidate the regulation of specific markers of global surgical insult (nociception, inflammation, stress responses) associated to specific physiological mechanisms related to pain in children with and without verbal skills undergoing major orthopaedic surgery. This project creates a unique opportunity to directly characterize and compare MSK and surgical pain subjectively in the two different patient samples (verbal and non-verbal). As molecular events of pathophysiological processes are quantifiable, the investigators will test for associations between the expression of front-running pain biomarkers in physiological fluids (blood and saliva) and the experience of pain in two patient samples (verbal and non-verbal) undergoing major orthopaedic surgery. The identification of biomarkers will provide a deeper understanding of a patient's pain perception alongside self-report or observers' report subjective measurements. Even with standardization of best practice perioperative anesthetic pain management, children undergoing similar surgical procedures experience pain at different intensity. Based on preliminary findings, treatment modalities appear to be ineffective in one out of five patients. Pain experience variability may originate in the lack of rigor in the clinical pain assessment tools. Tools such as numerical rating scales used in the perioperative period are not based on objective patient specific pain thresholds. A personalized mechanism-based approach may be the key to better identify a patient's postsurgical pain outcome and how this assessment could lead to personalized perioperative pain management. The ultimate goal is to use this information to offer the highest quality of pain control in children with MSK conditions, and more specifically in children with limited communication skills unable to communicate their distress associated with the surgical procedures.

Eligibility Criteria:
Inclusion Criteria:

* Aged between 10 and 21 years old
* Scheduled to undergo posterior or anterior spinal fusion surgery for AIS with instrumentation
* Ability to adequately understand and respond to outcome measures
* No previous major orthopedic surgery
* Female or male
* Any ethnic background

Exclusion Criteria:

* Inability of the child to speak English or French
* Diagnosed with developmental delay that would interfere with understanding questions being asked (autism, mental retardation)
* Children with major chronic medical conditions (ASA status III or higher)