Table 2

Achilles tendon disorders in the UCL cohort, comparison of preseason and competitive season in male professional football

PreseasonCompetitive seasonp Value
Achilles tendon disorders, n (percentage of total number of injuries)54 (3.8)149 (2.3)<0.001
Reinjuries, n (%)17 (31)36 (24)0.306
Lay-off days, mean±SD32±5628±45N/A
Lay-off days, median (Q1–Q3)11 (4–27)10 (4–27)0.964
Injury rate* (95% CI)0.25 (0.19 to 0.33)0.18 (0.15 to 0.21)0.027
Training injuries0.17 (0.12 to 0.24)0.14 (0.11to 0.17)0.302
Match injuries0.81 (0.54 to 1.24)0.37 (0.29 to 0.49)0.003
Injury severity, n (%)0.821
Slight/minimal (0–3 days)13 (24)28 (19)
Mild (4–7 days)10 (19)34 (23)
Moderate (8–28 days)18 (33)52 (35)
Severe (>28 days)13 (24)35 (23)
Injury burden† (95% CI)8.16 (7.78 to 8.55)4.97 (4.82 to 5.12)<0.001
  • *Injury rate expressed as the number of injuries/1000 h of total exposure.

  • †Injury burden expressed as the number of days of absence/1000 h of total exposure (injury rate×mean absence).

  • N/A, not applicable; Q1, 25th percentile; Q3, 75th percentile; UCL, UEFA Champions League.