In recent literature, the potential of guided growth of the proximal femur to modify hip growth in patients with cerebral palsy has been shown. Using medial hemi-epiphysiodesis of the proximal femur (TMH-PF) morphology of hips at risk of symptomatic (sub)luxation in cerebral palsy (CP) can be changed, aiming to reduce further hip migration and the need for more invasive surgical treatment modalities. Further research is necessary to assess if the results of TMH-PF in combination with adductor tenotomies are significantly better than the results of the current standard of care; adductor tenotomies alone.

The investigators objective is to determine whether guided growth of the proximal femur decreases the risk of further hip migration and need for further surgery in cerebral palsy patients.

Inclusion Criteria:

• Spastic CP
• GMFCS level IV-V
• Aged 2-8 years
• At least one hip with an abduction in flexion ≤ 40 degrees
• Migration percentage of 30-50%
• Head shaft angle > 145

Exclusion Criteria:

• Not fit for surgery
• History of bony hip surgery to the affected hip
• Severe acetabular dysplasia defined as a gothic arch, an incongruent joint or an acetabular index > 30 degrees, consistent with A2 and A3 acetabular deformity according to Robin and Graham in an adequately performed radiographs

Individual de-identified participant data that underlie the results from the GUIDANCE study and the study protocol will be shared if requested. Data will be available beginning 12 months and ending 5 years following publication of this paper. Data will be available for researchers who provide a methodologically sound scientific proposal, which has been approved by an ethical committee. Proof of the latter should be provided. Analyses should achieve the aims as reported in the approved proposal. Proposals for data should be directed to the corresponding author.

Data will be available beginning 12 months and ending 5 years following publication of this paper

Data will be available for researchers who provide a methodologically sound scientific proposal, which has been approved by an ethical committee. Proof of the latter should be provided. Analyses should achieve the aims as reported in the approved proposal.