Operational definitions
| Training session | Team training that involved physical activity under the supervision of the coaching staff |
| Match | Official or friendly competition against another team |
| Injury | Injury resulting from playing football and leading to a player being unable to fully participate in future training or match play (ie, time-loss injury) |
| Metatarsal 5 fracture | A traumatic or stress injury to the fifth metatarsal bone with a visible fracture line on imaging leading to a player being unable to fully participate in training or match play |
| Rehabilitation | The period during which the team's medical staff prohibited full participation in training, and availability for match selection |
| Lay-off | Number of days until the player resumed full-team training |
| Reinjury | Injury of the same type and at the same site as an index injury occurring no more than 2 months after a player's return to full participation from the index injury |
| Severe injury | Injury causing absence of over 28 days from training and match play |
| Traumatic fracture | Injury with sudden onset |
| Stress fracture | Injury with insidious onset |
| Torg type I | Fracture line with sharp margins and no widening, minimal cortical hypertrophy, minimal evidence of periostal reaction to chronic stress and no intramedullary sclerosis |
| Torg type II | Fracture line with associated periostal bone union, widened fracture line with adjacent radiolucency related to bone absorption and evidence of intramedullary sclerosis |
| Torg type III | Wide fracture line, periostal new bone and radiolucency and complete obliteration of the medullary canal at the fracture site by sclerotic bone |