Apophyseal Injuries in Male Youth Academy Footballers: Distal-to-Proximal Progression with Age in 16,024 Player-Seasons (bjsm.bmj.com)

• 603 apophyseal injuries (5.7% of all) in 16,024 player-seasons; 7.1% of total days lost.
• Clear distal-to-proximal progression: ankle/foot (U9-U11) → knee (U12) → hip/groin (U15-U18).
• Highest incidence and burden in U12-U16 groups (0.4/1000h and ~20 days/1000h).
• Median severity increased with age: from 20 days (U9-U11) to 38 days (U15-U16).

"This two-season prospective cohort study from Premier League and Category One Academies analyzed 16,024 player-seasons across U9-U21 male players. Of 10,589 injuries, 603 were apophyseal (5.7%), causing 7.1% of total days lost. Injuries followed a distal-to-proximal progression: ankle/foot in U9-U11, knee in U12, hip/groin in U15-U18. Highest incidence (~0.4/1000h) and burden (~20 days/1000h) occurred in U12-U16. Hip/groin and knee had highest burden overall. Median severity increased with age from 20 to 38 days. Findings emphasize age-specific mitigation strategies."