Gross morphology of menisci showed tears and synovial swelling at 24hr post-impaction. Gross morphology of menisci immediately after dissection in (A) control knee and (B) impacted left knee resulting in ACL tear. Dashed lines highlight tears in the posterior region of both menisci. Synovial swelling after 24 hrs incubation was generally greater for (D) impacted knees compared to (C) control limbs. L = lateral, M = medial.