The main functions of foot drop foot brace include:

1. Assisting dorsiflexion: Wearing a foot brace can assist foot dorsiflexion when standing and walking, helping patients better control the position of the foot.

2. Controlling foot inversion and varus: The foot brace can help fix the ankle joint and prevent the foot from inversion and varus, thereby protecting the stability of the ankle joint.

3. Improving walking stability: By improving the stability of landing, the risk of falling for patients with foot drop will be reduced, allowing them to walk more safely.

4. The effect of long-term wearing: Long-term wearing of the foot brace can increase the strength of the calf muscles, reduce muscle tension, increase joint mobility, and help patients restore normal walking ability.