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Table 2 Knee osteoarthritis, severe knee injury and surgery, and physical knee function among current and retired professional footballers

From: Knee osteoarthritis in professional football is related to severe knee injury and knee surgery

  Current professional footballers Retired professional footballers
Prevalence of knee OA (%; 95%CI) 12.9 (10.6–15.1) 27.5 (22.8–32.1)
Severe knee injuries (mean; min-max)
Total 0.7 (0–10) 1.4 (0–10)
No knee OA 0.6 (0–10) 0.8 90–10)
Knee OA 1.7 (0–10) 3.2 (0–10)
Knee surgeries (mean; min-max)
Total 0.5 (0–7) 1.2 (0–10)
No knee OA 0.3 (0–6) 0.7 (0–10)
Knee OA 1.4 (0–7) 2.8 (0–10)
KOOS-SP (mean ± SD)
Total 88 ± 16 82 ± 19
No knee OA 90 ± 14 88 ± 16
Knee OA 76 ± 20 64 ± 16
Reference value KOOS-SP (mean)
General populationa 87–92 87–92
Young athletic populationb 86–99 86–99
Amateur footballersc 87–96 87–96
  1. No OA group without knee osteoarthritis, OA group with knee osteoarthritis, SD standard deviation, a Paradowski et al. 2006, b Cameron et al. 2013, c Frobell et al. 2008