Table 1.

Design considerations. Considerations regarding the design of the study and the participants/children

Issue of consideration	Impact on study design
Compliance by patients, families and practitioners for the recommended interdisciplinary interventions	Patients and familiesParents and the local team will receive the gait analysis report where the impairments are outlined and the recommendations are explained.
	PractitionersThe local team will be contacted and given the opportunity to ask questions about the report and recommendations.
Risk of noncompliance with intervention amongst practitioners who are responsible for healthcare for two or more participants.	Physical therapy First randomised patient will undergo randomisation as described. The remaining patients followed by the same physiotherapist will be given the same allocation.
	Orthopaedic surgery, spasticity management, orthotics Relatively few practitioners carry out these interventions; therefore it is not possible to take into account the risk of noncompliance with the intervention amongst practitioners.
Synchronisation of interventions	Gradually, it could be assumed that methods/knowledge/attention introduced by the IGA will influence the control group. This will be evaluated post-hoc via a comparison of interventions used in the control group in the first 6 months of the study with the interventions used in the last 6 months of the study.