Effects of botulinum toxin injections in the upper limbs of children with cerebral palsy: A systematic review of the literature.

[BACKGROUND] Spasticity is a common motor disorder in children with cerebral palsy (CP). Upper limb CP impairment has a significant negative impact on daily activities. Botulinum toxin (BTX-A) injections are widely used to reduce spasticity, but their effectiveness is not well-defined. We performed a systematic review of literature to answer questions about the effectiveness of BTX-A injections in the upper limb in children with CP.

[METHODS] A systematic review of literature was conducted according to PRISMA guidelines. Eligible studies were randomized controlled trials with a high level of evidence on BTX-A upper limb injections in children. The outcomes analyzed included the study population, spasticity, quality of movement, activity limitations, quality of life, pain, appearance and side effects.

[RESULTS] A total of 24 studies were included. The number of patients included was 1358 with a mean age between 3 and 11years. Improvement after BTX-A injection compared to the control group was observed for spasticity (n=10/19 studies), bimanual activities (Assisting Hand Assessment) (n=3/7), activity limitations (n=6/11), pain (n=2/2) and appearance (n=2/2). No study found an improvement in quality of life. Side effects were described in 16 studies and were moderate in all cases.

[CONCLUSION] This review of literature showed that BTX-A injections can improve spasticity and particularly activity limitations when reasonable objectives are established.

[LEVEL OF EVIDENCE] IV, systematic review.