Ankle ligament repair needed what happens during the surgery?

Depends: This depends on what the surgeon has planned based on your case. This could be simple re-opposition of the torn or lax structures or it could be as complex as rerouting one of your native tendons for recreation of the ligamentous structure or use of a donor tendon/ligament/tissue to recreate them. Talk to your surgeon for more detailed and specific info to your case.

Different options: Most ankle ligament surgery involves either tightening up existing ligaments if they are in satisfactory condition (modified brostrum) or using a portion of a tendon to replace the deficient ligaments (anatomic free tendon reconstruction). "non anatomic reconstructions" have fallen out of favor.