Recovery Trajectories of Patients with Mild Traumatic Brain Injury.

Area of Science:

• Neuroscience
• Psychology
• Rehabilitation Medicine

Background:

• Mild traumatic brain injury (mTBI) presents heterogeneous symptom patterns and recovery trajectories.
• The fear-avoidance model (FAM) offers a framework for understanding this heterogeneity in postconcussion symptoms (PCS).

Purpose of the Study:

• To identify distinct longitudinal classes of PCS following mTBI.
• To examine how these classes differ in FAM components and long-term outcomes.
• To compare mTBI trajectories with those in an orthopedic injury control group.

Main Methods:

• Longitudinal study involving 185 mTBI patients and 180 orthopedic injury controls.
• Multivariate latent class growth analysis to identify symptom trajectory classes (cognitive, emotion, somatic).
• Assessment of PCS, catastrophizing, activity avoidance, somatic focus, depression, and participation at multiple time points.

Main Results:

• Four distinct symptom trajectory classes were identified in the mTBI group: high maintained symptoms (5.9%), high decreasing symptoms (20.5%), moderate decreasing symptoms (19.5%), and low decreasing symptoms (54%).
• Membership in the high symptom classes (Class 1 and 2) predicted worse outcomes, including increased catastrophizing, activity avoidance, depression, and participation dissatisfaction.
• Two classes were identified in the control group, highlighting universal impacts of behavioral factors.

Conclusions:

• Findings underscore significant heterogeneity in mTBI recovery, with specific symptom trajectories linked to poorer outcomes.
• Person-related behavioral characteristics, such as catastrophizing and avoidance, universally impact recovery across conditions.
• Early identification of individuals with high emotion/somatic symptoms, catastrophizing, and depression at 2 weeks post-injury is crucial for targeted interventions.