Frequency (%), incidence per squad season* for type and location of time-loss injuries
| Age groups | ||||||||||||||||||||||
| U-9 | U-10 | U-11 | U-12 | U-13 | U-14 | U-15 | U-16 | U-17 | U-18 | U-19 | ||||||||||||
| n=96 | n=103 | n=114 | n=111 | n=98 | n=112 | n=115 | n=112 | n=106 | n=108 | n=17 | ||||||||||||
| Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | Frequency (% of total) | Incidence per squad* /season | |
| Type of injuries | ||||||||||||||||||||||
| Concussion | - | - | - | - | - | - | - | - | 1 (0.9) | 0.3 | - | - | 2 (0.9) | 0.4 | 3 (1.1) | 0.7 | 4 (2.0) | 0.9 | - | - | - | - |
| Lesion of meniscus and cartilage | - | - | - | - | - | - | - | - | - | - | 2 (1.1) | 0.4 | 1 (0.5) | 0.2 | 5 (1.9) | 1.1 | 5 (2.5) | 1.2 | 5 (2.7) | 1.2 | 1 (4.0) | 1.5 |
| Contusion/bruise/hematoma | 7 (35.0) | 1.8 | 20 (69.0) | 4.9 | 22 (45.8) | 4.8 | 23 (48.9) | 5.2 | 32 (28.8) | 8.2 | 38 (21.3) | 8.5 | 50 (23.4) | 10.9 | 77 (29.2) | 17.2 | 41 (20.1) | 9.7 | 26 (14.3) | 6 | 1 (4.0) | 1.5 |
| Fracture (non physeal) | 2 (10.0) | 0.5 | - | - | 1 (2.1) | 0.2 | 2 (4.3) | 0.5 | 1 (0.9) | 0.3 | 10 (5.6) | 2.2 | 9 (4.2) | 2 | 1 (0.4) | 0.2 | 2 (1.0) | 0.5 | 9 (4.9) | 2.1 | - | - |
| Muscle strain/rupture | - | - | - | - | - | - | 1 (2.1) | 0.2 | 7 (6.3) | 1.8 | 12 (6.7) | 2.7 | 22 (10.3) | 4.8 | 22 (8.3) | 4.9 | 25 (12.3) | 5.9 | 31 (17.0) | 7.2 | 6 (24.0) | 8.8 |
| Abrasion/laceration | - | - | - | - | - | - | - | - | - | - | 2 (1.1) | 0.4 | 1 (0.5) | 0.2 | 1 (0.4) | 0.2 | - | - | - | - | - | - |
| Other bone injury | 1 (5.0) | 0.3 | - | - | - | - | - | - | 1 (0.9) | 0.3 | 1 (0.6) | 0.2 | 2 (0.9) | 0.4 | 7 (2.7) | 1.6 | 2 (1.0) | 0.5 | 8 (4.4) | 1.9 | 7 (28.0) | 10.3 |
| Tendinopathy | - | - | 1 (3.4) | 0.2 | - | - | - | - | 1 (0.9) | 0.3 | 1 (0.6) | 0.2 | 1 (0.5) | 0.2 | 1 (0.4) | 0.2 | 2 (1.0) | 0.5 | 3 (1.6) | 0.7 | - | - |
| Dislocation/subluxation | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 (1.0) | 0.5 | 1 (0.5) | 0.2 | - | - |
| Synovitis/effusion | 1 (5.0) | 0.3 | - | - | - | - | - | - | - | - | 1 (0.6) | 0.2 | 1 (0.5) | 0.2 | 4 (1.5) | 0.9 | 1 (0.5) | 0.2 | 1 (0.5) | 0.2 | - | - |
| Overuse unspecific | - | - | 1 (3.4) | 0.2 | 2 (4.2) | 0.4 | 2 (4.3) | 0.5 | 4 (3.6) | 1 | 11 (6.2) | 2.5 | 8 (3.7) | 1.7 | 16 (6.1) | 3.6 | 11 (5.4) | 2.6 | 11 (6.0) | 2.5 | 1 (4.0) | 1.5 |
| Other injury | 2 (10.0) | 0.5 | - | - | 3 (6.3) | 0.7 | - | - | - | - | 3 (1.7) | 0.7 | 4 (1.9) | 0.9 | 2 (0.8) | 0.4 | 5 (2.5) | 1.2 | 2 (1.1) | 0.5 | - | - |
| Functional muscle disorder | - | - | - | - | 3 (6.3) | 0.7 | 5 (10.6) | 1.1 | 14 (12.6) | 3.6 | 35 (19.7) | 7.8 | 41 (19.2) | 8.9 | 38 (14.4) | 8.5 | 29 (14.2) | 6.8 | 21 (11.5) | 4.9 | 4 (16.0) | 5.9 |
| Growth related condition | 1 (5.0) | 0.3 | 4 (13.8) | 1 | 12 (25.0) | 2.6 | 12 (25.5) | 2.7 | 25 (22.5) | 6.4 | 44 (24.7) | 9.8 | 32 (15.0) | 7 | 35 (13.3) | 7.8 | 28 (13.7) | 6.6 | 13 (7.1) | 3 | 2 (8.0) | 2.9 |
| Physeal fracture | - | - | 1 (3.4) | 0.2 | 1 (2.1) | 0.2 | 2 (4.3) | 0.5 | 8 (7.2) | 2 | 4 (2.2) | 0.9 | 7 (3.3) | 1.5 | 10 (3.8) | 2.2 | 3 (1.5) | 0.7 | 1 (0.5) | 0.2 | - | - |
| Sprain/ligament injury | 6 (30.0) | 1.6 | 2 (6.9) | 0.5 | 4 (8.3) | 0.9 | - | - | 17 (15.3) | 4.3 | 14 (7.9) | 3.1 | 33 (15.4) | 7.2 | 42 (15.9) | 9.4 | 44 (21.6) | 10.4 | 50 (27.5) | 11.6 | 3 (12.0) | 4.4 |
| Locations | ||||||||||||||||||||||
| Head/face | - | - | - | - | - | - | - | - | 1 (0.9) | 0.3 | 2 (1.1) | 0.4 | 4 (1.9) | 0.9 | 4 (1.5) | 0.9 | 4 (2.0) | 0.9 | - | - | - | - |
| Neck/cervical spine | - | - | - | - | - | - | - | - | - | - | 1 (0.6) | 0.2 | 3 (1.4) | 0.7 | 1 (0.4) | 0.2 | - | - | - | - | - | - |
| Shoulder/clavicula | 2 (10.0) | 0.5 | - | - | 1 (2.1) | 0.2 | - | - | - | - | 2 (1.1) | 0.4 | 4 (1.9) | 0.9 | - | - | 1 (0.5) | 0.2 | 3 (1.6) | 0.7 | - | - |
| Upper arm | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Elbow | - | - | 1 (3.4) | 0.2 | - | - | - | - | - | - | 1 (0.6) | 0.2 | - | - | 1 (0.4) | 0.2 | 1 (0.5) | 0.2 | 1 (0.5) | 0.2 | - | - |
| Forearm/wrist | - | - | - | - | 2 (4.2) | 0.4 | 4 (8.5) | 0.9 | 3 (2.7) | 0.8 | 3 (1.7) | 0.7 | 4 (1.9) | 0.9 | 2 (0.8) | 0.4 | 4 (2.0) | 0.9 | 2 (1.1) | 0.5 | - | - |
| Hand/fingers | 1 (5.0) | 0.3 | 2 (6.9) | 0.5 | - | - | 1 (2.1) | 0.2 | 10 (9.0) | 2.6 | 5 (2.8) | 1.1 | 5 (2.3) | 1.1 | 3 (1.1) | 0.7 | 2 (1.0) | 0.5 | 6 (3.3) | 1.4 | - | - |
| Ribs/thoracic spine | - | - | - | - | 1 (2.1) | 0.2 | 1 (2.1) | 0.2 | - | - | 1 (0.6) | 0.2 | 2 (0.9) | 0.4 | 1 (0.4) | 0.2 | 1 (0.5) | 0.2 | 2 (1.1) | 0.5 | 1 (4.0) | 1.5 |
| Abdomen/lumbar spine | - | - | - | - | - | - | 2 (4.3) | 0.5 | 6 (5.4) | 1.5 | 8 (4.5) | 1.8 | 16 (7.5) | 3.5 | 16 (6.1) | 3.6 | 5 (2.5) | 1.2 | 5 (2.7) | 1.2 | - | - |
| Pelvis/hip/groin | - | - | - | - | 3 (6.3) | 0.7 | 4 (8.5) | 0.9 | 7 (6.3) | 1.8 | 29 (16.3) | 6.5 | 32 (15.0) | 7 | 37 (14.0) | 8.3 | 37 (18.1) | 8.7 | 18 (9.9) | 4.2 | 4 (16.0) | 5.9 |
| Thigh | - | - | - | - | - | - | - | - | 1 (0.9) | 0.3 | - | - | - | - | 3 (1.1) | 0.7 | 3 (1.5) | 0.7 | 2 (1.1) | 0.5 | 1 (4.0) | 1.5 |
| Quadriceps | - | - | 2 (6.9) | 0.5 | 3 (6.3) | 0.7 | 4 (8.5) | 0.9 | 11 (9.9) | 2.8 | 13 (7.3) | 2.9 | 19 (8.9) | 4.1 | 24 (9.1) | 5.4 | 22 (10.8) | 5.2 | 22 (12.1) | 5.1 | 1 (4.0) | 1.5 |
| Hamstring | - | - | 1 (3.4) | 0.2 | 2 (4.2) | 0.4 | 4 (8.5) | 0.9 | 5 (4.5) | 1.3 | 20 (11.2) | 4.5 | 20 (9.3) | 4.3 | 25 (9.5) | 5.6 | 22 (10.8) | 5.2 | 22 (12.1) | 5.1 | 5 (20.0) | 7.4 |
| Adductor | - | - | 1 (3.4) | 0.2 | - | - | 1 (2.1) | 0.2 | 6 (5.4) | 1.5 | 13 (7.3) | 2.9 | 12 (5.6) | 2.6 | 12 (4.5) | 2.7 | 12 (5.9) | 2.8 | 13 (7.1) | 3 | 2 (8.0) | 2.9 |
| Knee | 4 (20.0) | 1 | 9 (31.0) | 2.2 | 9 (18.8) | 2 | 6 (12.8) | 1.4 | 16 (14.4) | 4.1 | 15 (8.4) | 3.3 | 16 (7.5) | 3.5 | 34 (12.9) | 7.6 | 26 (12.7) | 6.1 | 31 (17.0) | 7.2 | 2 (8.0) | 2.9 |
| Lower leg | 1 (5.0) | 0.3 | 3 (10.3) | 0.7 | 3 (6.3) | 0.7 | 9 (19.1) | 2 | 15 (13.5) | 3.8 | 26 (14.6) | 5.8 | 20 (9.3) | 4.3 | 21 (8.0) | 4.7 | 4 (2.0) | 0.9 | 8 (4.4) | 1.9 | 3 (12.0) | 4.4 |
| Calf/Achilles tendon | 2 (10.0) | 0.5 | 1 (3.4) | 0.2 | 2 (4.2) | 0.4 | 1 (2.1) | 0.2 | 5 (4.5) | 1.3 | 4 (2.2) | 0.9 | 5 (2.3) | 1.1 | 10 (3.8) | 2.2 | 7 (3.4) | 1.7 | 4 (2.2) | 0.9 | 1 (4.0) | 1.5 |
| Ankle | 7 (35.0) | 1.8 | 3 (10.3) | 0.7 | 6 (12.5) | 1.3 | - | - | 15 (13.5) | 3.8 | 15 (8.4) | 3.3 | 37 (17.3) | 8 | 41 (15.5) | 9.2 | 42 (20.6) | 9.9 | 35 (19.2) | 8.1 | 4 (16.0) | 5.9 |
| Foot/toes | 3 (15.0) | 0.8 | 6 (20.7) | 1.5 | 16 (33.3) | 3.5 | 10 (21.3) | 2.3 | 10 (9.0) | 2.6 | 20 (11.2) | 4.5 | 15 (7.0) | 3.3 | 29 (11.0) | 6.5 | 11 (5.4) | 2.6 | 8 (4.4) | 1.9 | 1 (4.0) | 1.5 |
| Total | 20 (100.0) | 5.2 | 29 (100.0) | 7 | 48 (100.0) | 10.5 | 47 (100.0) | 10.6 | 111 (100.0) | 28.3 | 178 (100.0) | 39.7 | 214 (100.0) | 46.5 | 264 (100.0) | 58.9 | 204 (100.0) | 48.1 | 182 (100.0) | 42.1 | 25 (100.0) | 36.8 |
*The incidence per squad per season is established on a squad of 25 players.