Table 1 Patient demographics

Patients, n (%)

1,160 (3.9)

28,843 (96.1)

Age, years (mean [95%CI])

33.2 (32.5–33.9)

28.3 (28.1–28.4)

 < 0.001^a

Gender male: female (ratio)

70:30

60:40

 < 0.001^b

Meniscus injury, n (%)

357 (31)

12,427 (43)

 < 0.001 ^b

Cartilage injury, n (%)

514 (44)

13,753 (48)

0.027 ^b

Time from injury to surgery, month (mean [95%CI])

24.1 (21.3–27.0)

20.5 (20.1–21.0)

0.005 ^a

Knee dislocation classification (Schenck)

- KD I, n (%)

903 (78)

- KD II, n (%)

86 (7)

- KD IIIM, n (%)

71 (6)

- KD IIIL, n (%)

88 (8)

- KD IV, n (%)

12 (1)

Injury mechanism

- ADL, n (%)

197 (17)

2,347 (8)

 < 0.001 ^b

- Traffic, n (%)

216 (19)

812 (3)

- Work, n (%)

64 (6)

732 (3)

- Sport—pivoting, n (%)

335 (29)

16,717 (58)

- Sport—non-pivoting, n (%)

304 (26)

7,126 (25)

- Unknown, n (%)

44 (4)

1,109 (4)

Patient reported outcome scores (Baseline)

 KOOS

n = 371 (32%)

n = 10,057 (35%)

 - Symptoms (mean [95%CI])

68.3 (66.6–70.1)

71.1 (70.8–71.4)

 < 0.001 ^a

 - Pain (mean [95%CI])

65.3 (63.2–67.4)

71.3 (70.9–71.6)

 < 0.001 ^a

 - ADL (mean [95%CI])

69.1 (66.8–71.3)

78.9 (78.5–79.2)

 < 0.001 ^a

 - Sport (mean [95%CI])

26.7 (24.0–29.3)

38.0 (37.5–38.5)

 < 0.001 ^a

 - QOL (mean [95%CI])

32.9 (31.1–34.7)

39.0 (38.7–39.3)

 < 0.001 ^a

 Tegner (mean [95%CI])

2.3 (2.1–2.5)

3.1 (3.0–3.1)

 < 0.001 ^a