In patients with ACL injury treated according to clinical practice, to explore: (1) the rate and time from injury to return to pre-injury sport IKDC sports level (RTS), (2) RTS rates to specific sports, and (3) patients' reported knee function. Prospective multicentre cohort study. 270 patients (53% females). Within three years of the injury, 178 patients (66%) had undergone ACL reconstruction (ACLR). Time from injury to RTS. Patient-reported knee function was evaluated with the Single Numeric Assessment Scale (SANE). Overall, 210 (78%) patients RTS. IKDC level-I and level-II patients RTS later (12 [95% CI 10-13] and 10 [95% CI 7-13] vs. 2 [95% CI 2-3] months, p