Hi
From the above mentioned information about the child. Further assessment should be done for effective intervention:
- Check if the child has Pattela Alta, because this will reduce the effectiveness of Quadriceps pull so, the child will never be able to do full knee extension actively.
- Check if the child suffers from any femoral or Tibial torsion
- Check both ankles in open and closed chain.

I would like to suggest the following:
- Facilitate extension postural pattern of movement
- Use Kay reverse posture walker, this will facilitate the upright posture.
- if possible refer the child for Botulinum Toxin A Injection in the spastic muscles particularly hips Adductors.
- I agree with Fateema regarding using Bobath approach and not using elictrical stimulation.
Best regards