A randomized control trial where subjects following an anterior cruciate ligament reconstruction will be randomized to either a control group who will receive the normal rehabilitation or an experimental group who will perform a 2-week gait rehabilitation using the anti-gravity treadmill in addition to the normal rehabilitation. The intervention will be added to the existing care received at Linkoping University Hospital 2 weeks post-surgery, while the evaluation will be performed in week 5 and 12 post-surgery using: a 3D-gait analysis (with the Qualisys software), self-reported function questionnaires and a clinical examination.