Brief summary, from the abstract
Across 134 video-analysed ACL injuries in professional male footballers, the great majority happened without direct contact to the knee, with indirect-contact injuries just as common as truly non-contact ones, pointing to mechanical perturbation as a key trigger. Knee valgus loading was the dominant injury pattern, usually arising during pressing, being tackled, or kicking.
- Of 148 consecutive ACL injuries over 10 seasons of Italian football, 134 (90%) videos were analysed and biomechanics assessed in 107 cases.
- 88% of injuries involved no direct knee contact: 59 (44%) were non-contact and 59 (44%) were indirect contact, with only 16 (12%) direct contact.
- Knee valgus loading was the dominant pattern in 83 cases (81%); the main situations were pressing and tackling (n=55), being tackled (n=24), regaining balance after kicking (n=19), and landing (n=8).
- 62% of injuries occurred in the first half of matches (p<0.01); this is observational video analysis from a single league, so it describes patterns rather than proving cause.
Clinically assessing this area? See the knee special tests.