CNS Changes Following Upper Limb Loss

University of Zurich (UZH)

Status: Enrolling

Conditions: Amputation, Congenital; Upper Limb; Amelia

Treatments: Diagnostic Test: MRI

Study type: Observational

Funder types: Other

Identifiers

NCT06043518

2018-00937 - Upper Limb Loss

Details and patient eligibility

About

The objective of this study is to better understand the structural and functional changes that the central nervous system (CNS) undergoes following congenital upper limb loss. The focus is on the brain's sensory processing and how neuronal changes may relate to clinical measures. By doing so, the hope is to gain insight into the contribution of critical periods to the plasticity of the sensorimotor processing stream. Both macroscopic and microscopic changes of the brain will be examined in individuals with upper limb amelia and compared to healthy controls. fMRI will be combined with behavioural testing to understand which clinical and behavioural determinants drive somatosensory representations along the entire somatosensory processing stream. Using advanced imaging techniques, the aim is to investigate the contribution of brainstem reorganisation to plasticity observed at the cortical level and, by doing so, gain a better understanding of the mechanistic underpinnings of functional reorganisation. Overall, the hope is to provide the first mechanistic insight into whether early life experiences are crucial for the development of the relay nuclei in the central nervous system and how these changes relate to clinical measures such as adaptive behaviours or pain.

Enrollment: 70 estimated patients

Sex: All

Ages: 18 to 75 years old

Volunteers: Accepts Healthy Volunteers

Inclusion and exclusion criteria

Inclusion Criteria - Patients:

• Age 18-75
• Upper-limb congenital amputees with complete absence of a hand
• Signed informed consent

Exclusion Criteria - Patients:

• Contraindications to magnetic resonance imaging
• Neurological impairment of body function impairments not induced by spinal cord injury
• BMI > 40
• Pregnancy
• Claustrophobia

Inclusion Criteria - Healthy subjects:

• Age 18-75
• Signed Informed consent

Exclusion Criteria - Healthy subjects:

• Contraindications to magnetic resonance imaging
• Pregnancy
• Neurological illness
• Impairment of body function induced by a congenital upper-limb amputation
• Claustrophobia
• BMI > 40

Trial design

70 participants in 2 patient groups

Patients with congenital amputation

Treatment:

Diagnostic Test: MRI

Diagnostic Test: MRI

Healthy subjects

Treatment:

Diagnostic Test: MRI

Diagnostic Test: MRI