Table 1 Inclusion and exclusion criteria for patients after ACL-IB, patients after ACL-R, and controls

Inclusion criteria

2 years since surgery

No previous injury of lower extremity, menisci, or ligament apparatus of the knee

ACL repair and InternalBrace™-augmentation for proximal ACL ruptures (Sherman Classification Types I and II [45]) operated within 5 weeks after index injury

ACL reconstruction with autologous hamstring (semitendinosus, and if needed gracilis) tendon operated the latest 8 months after index injury

Exclusion criteria

Concomitant rupture of posterior cruciate ligament or complete rupture of both collateral ligaments

Previous injury or surgical treatment of the injured leg within the past 6 months

Previous surgical treatment of the contralateral leg