How long should sprained ankle be treated by physio before referral to a surgeon?

Sprained ankle 5 weeks ago, now seeing a physio (ulyrasound; joint manipulation and adhesion release) and icing, exercising at home. No fracture seen on early x-rays. Both sides of ankle still red/swollen. Can still not put weight on foot and walking almost imposible. Takimg anti- infatory tablets and applying anti-inflam gel.