In a Spina Bifida child the ability to walk depends on the overall muscle power at the hip, knee and ankle. Despite a dislocation and a foot deformity the child may still be able to walk. Therefore, clinical assessment and charting of muscle power in all the muscles of the lower limb is important before we can prognosticate on any thing.
The foot deformity can be corrected but the type of surgery can be decided only by assessing the foot clinically.
Similarly at the hip dislocation can be reduced. However, the hip will stay in place only if muscle power around the hip can be balanced. To prevent a re-dislocation some muscle/tendon transfer will be required. This is possible only if there is sufficient power available in the muscles around the hip and they can be transferred to achieve balance of power of muscles. This again is possible only by clinical examination.
The procedures are quite standard and there are no new major innovations. There are individual surgeons/institution based modifications which are expected.
It is difficult to name good hospitals or doctors but I would suggest consult an orthopaedic surgeon in a centre where paediatric orthopaedic surgery is performed routinely. Orthopaedic surgeons dealing adult orthopaedic surgery alone will not suffice.