The goal of this clinical trial is to determine if radial Extracorporeal shockwave therapy (rESWT) reduces spasticity in children with Cerbral Palsy (CP) or traumatic brain injury (TBI). The main questions it aims to answer are: * Is it feasible to implement radial shockwave therapy in conventional physiotherapy plan in children with CP or TBI? * Is it safe and effective to use rESWT for reducing spasticity in children with CP or TBI? Participants will receive a 4 week therapy intervention, as add on to the conventional physio (usual care), including one rESWT session per week for a total of 4 sessions.
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Modified Ashworth Scale
Timeframe: Change from baseline to the end of intervention sessions at week 4
Modified Ashworth Scale
Timeframe: Change from baseline to 3 months follow-up