Effects of botulinum toxin on pain control mechanisms, muscle structure and cortical reorganization, a mini-review

Abstract

Spasticity often results in significant disability, which complicates rehabilitation and daily activities. This review explores the role of botulinum toxin type A (BoNT-A) in the treatment of spasticity, focusing on its effects on muscle structure and activity, function, cortical reorganization, and pain. Our findings indicate that BoNT-A injections improve motor function and gait, particularly in stroke patients, by reducing abnormal muscle activity and enhancing postural control. However, BoNT-A may also induce unwanted biomechanical changes, such as muscle atrophy and alterations in contractile elements, which could impact long-term muscle function. Regarding pain management in spasticity, BoNT-A has shown promise by reducing both peripheral and central sensitization mechanisms. Additionally, BoNT-A influences the central nervous system (CNS) by inducing cortical reorganization, which may further contribute to clinical improvements. Lastly, BoNT-A treatment requires careful consideration of individual patient characteristics to optimize outcomes and minimize side effects. A multidisciplinary approach that combines BoNT-A with physical therapy is essential to maximize functional recovery and improve the quality of life in patients with spasticity.

Keywords: Botulinum toxin; Cortical reorganization; Muscle; Pain; Spasticity.