Would surgery be required for a mildly displaced trimalleolar fracture? and what is the typical recovery time to walk and then return to sport use?

Surgery likely: Most trimalleolar fractures are unstable, meaning they involve significant ligament injury & the bones will not heal in the correct position without surgery. Make sure you are following up with an ortho surgeon skilled in the management of these fractures. Total recovery time 6-12 months. If I can be of help, then join my care team and virtual practice at www.healthtap.com/dr-ClarkeHolmes