The Archives of Physical Medicine and Rehabilitation has published research on comparing the benefits of botox injections versus soft tissue surgery to the hip adductors.   One hundred ninety four children with cerebral palsy were studied - 69 children received no treatment, 60 children had surgery and 65 has botox injections.   The improvements in hip migration did not differ significantly between the botox and surgery group.   Improvements were greater in younger children and higher functioning children.  Children with high degrees of subluxation experienced advancing hip dislocation whether they received any of the treatments.  The researchers concluded that botox injections could be used in place of soft tissue surgery to prevent hip dislocation. 

Reference:  Comparison of Botulinum Toxin Type A Injection and Soft-Tissue Surgery to Treat Hip Subluxation in Children With Cerebral Palsy Eun Joo Yang, Dong-wook Rha, Hyun Woo Kim, Eun Sook Park Archives of Physical Medicine and Rehabilitation - November 2008 (Vol. 89, Issue 11, Pages 2108-2113, DOI: 10.1016/j.apmr.2008.04.019)