Virtual Reality and Dual-Task Training for Cortical Plasticity in Children With Brachial Plexus Injury

Brachial plexus birth injury (BPBI) is characterized by unilateral or bilateral upper extremity motor and sensory impairment resulting from injury to the cervical (C4-C5 to T1-T2) nerve roots and their associated structures during birth. BPBI often leads to limited active movement, muscle weakness, impaired proprioception, and secondary musculoskeletal problems. Beyond these peripheral symptoms, decreased use of the affected limb and chronic motor impairment may influence cognitive processes related to motor planning and execution. Recent literature also highlights the role of central nervous system plasticity in functional recovery; however, evidence remains limited, and long-term cortical adaptation patterns in children with BPBI are not well understood.

This randomized controlled study aims to compare the effects of two rehabilitation approaches-virtual reality (VR)-based exercises and motor-cognitive dual-task exercises-on cortical adaptation, joint range of motion, muscle strength, proprioception, and upper extremity function in children with BPBI. A secondary aim is to examine the relationship between cortical activation and functional performance.

A total of 14 children aged 7-14 years with C5-C6 or C5-C7 involvement, who have not undergone neurosurgery and score ≥26 on the Modified Pediatric Mini Mental Scale, will be included. Participants will be randomly allocated into two groups:

• VR-based exercise + conventional physiotherapy (n = 7),
• Dual-task motor-cognitive exercise + conventional physiotherapy (n = 7).

Interventions will be delivered for 12 weeks, three sessions per week, with each session lasting 1 hour. After the supervised intervention period, participants will continue with a structured home program for 9 months. Evaluations will be conducted at baseline, post-intervention (12 weeks), and at 12 months. Cortical activation will be assessed using functional magnetic resonance imaging (fMRI). Additional outcome measures will include joint range of motion, muscle strength, proprioception, Modified Mallet Classification, and the Brachial Plexus Outcome Measure.

This study is designed to provide novel insights into neuroplastic changes associated with two different rehabilitation approaches and to clarify long-term associations between cortical activation and functional recovery. The findings are expected to contribute to the development of multidisciplinary, neuromodulatory rehabilitation strategies aimed at improving upper extremity function and overall quality of life in children with BPBI.

Inclusion criteria

• Children aged 7-14 years
• Diagnosed with unilateral DBPP
• C5-C6 or C5-C7 involvement (Narakas I, IIa, IIb)
• Modified Pediatric Mini-Mental Scale score ≥26
• Child and parent willing to participate in the study

Exclusion criteria

• Previous nerve surgery for DBPP
• Surgery within the past year or Botulinum Toxin injection within the past 3 months
• Any neurological condition other than DBPP
• Vision or hearing impairments affecting participation
• Contraindications for fMRI
• Fixed contractures in shoulder, elbow, wrist, or finger joints
• Participation in regular physiotherapy or other rehabilitation programs within the past 3 months