Wear brace for few days till you seek opinion of some knee surgeon to prevent further damage and your surgeon shall decide after MRI or arthroscopy whether reconstruction of ligaments is possible, to my mind it is possible using graft from own body tissues(ilio tibial band,or some muscle tendon) or by By a procedure called LARS(ligament augmented reconstruction surgery) in which carbon filament is sewed on damaged ligament bridging the gap and which makes healthy tissue grow to fill the gap,patient is mo bile as early as 6 weeks after LARS and conventional body graft takes as long as 3- to 6 months for mobility. Meniscal injury can be assessed on MRI or arthroscopy and dealt with during ligament surgery itself, if still viable with some intact blood supply,can be repaired otherwise can be excised.