Match knee injury incidence (per 1000 hours), severity (days absence) and burden (days absence per 1000 hours)
| Injury category | Injury diagnosis | Count | Proportion of all knee injuries | Incidence (per 1000 hours and 95% CI) | Total days absence | Mean severity (95% CI) | Median severity (IQR) | Burden (days absence/ 1000 hours and 95% CI) |
| Anterior cruciate ligament | Complete rupture | 65 | 4.3 | 0.4 (0.3 to 0.5) | 16 695 | 257 (233 to 280) | 246 (204–288) | 108 (72 to 154) |
| Partial rupture | 7 | 0.5 | 0.05 (0.02 to 0.09) | 684 | 98 (19 to 176) | 58 (28–154) | 4 (3–7) | |
| Total | 72 | 4.7 | 0.5 (0.4 to 0.6) | 17 379 | 241 (217 to 266) | 242 (200–283) | 112 (74 to 160) | |
| Medial collateral ligament | Grade 1 | 155 | 10.2 | 1.0 (0.9 to 1.2) | 2093 | 14 (11 to 16) | 9 (4–15) | 14 (8 to 20) |
| Grade 2 | 165 | 10.9 | 1.1 (0.9 to 1.2) | 7937 | 48 (44 to 52) | 44 (35–57) | 51 (40 to 62) | |
| Grade 3 | 22 | 1.5 | 0.1 (0.1 to 0.2) | 1654 | 75 (58 to 93) | 70 (45–88) | 11 (6 to 16) | |
| Ungraded | 136 | 9.0 | 0.9 (0.7 to 1.0) | 5162 | 38 (30 to 46) | 17 (9–62) | 33 (22 to 45) | |
| Total | 478 | 31.5 | 3.1 (2.8 to 3.4) | 16 846 | 35 (32 to 38) | 27 (9–51) | 109 (84 to 133) | |
| Posterior cruciate ligament/ posterolateral corner | PCL—complete rupture | 69 | 4.5 | 0.4 (0.4 to 0.6) | 4391 | 64 (53 to 75) | 52 (30–90) | 28 (20 to 38) |
| PCL—partial rupture | 7 | 0.5 | 0.05 (0.02 to 0.09) | 298 | 43 (18 to 68) | 50 (16–64) | 2 (1–3) | |
| PCL—unspecified | 15 | 1.0 | 0.10 (0.05 to 0.16) | 1019 | 68 (38 to 98) | 61 (15–103) | 7 (5–9) | |
| Posterolateral complex strain/ tear | 37 | 2.4 | 0.2 (0.2 to 0.3) | 1221 | 33 (12 to 54) | 11 (5–25) | 8 (3–13) | |
| Popliteus tendinitis/strain | 17 | 1.1 | 0.1 (0.1 to 0.2) | 136 | 8 (4–12) | 5 (2–11) | 1 (0 to 1) | |
| LCL strain/rupture | 14 | 0.9 | 0.1 (0.05 to 0.2) | 429 | 31 (12 to 49) | 14 (6–60) | 3 (1–5) | |
| Total | 159 | 10.5 | 1.0 (0.9 to 1.2) | 7494 | 47 (39 to 55) | 30 (9–64) | 49 (36 to 61) | |
| Complex knee injury | Combined knee ligament injury without meniscal injury | 11 | 0.7 | 0.07 (0.04 to 0.13) | 2364 | 215 (158 to 271) | 212 (153–280) | 15 (8 to 27) |
| Combined knee ligament injury with meniscal injury | 13 | 0.9 | 0.08 (0.04 to 0.1) | 2812 | 216 (140 to 292) | 240 (121–281) | 18 (10 to 28) | |
| ACL rupture with meniscal injury | 11 | 0.7 | 0.07 (0.04 to 0.13) | 2551 | 232 (176 to 288) | 242 (197–292) | 17 (13 to 22) | |
| MCL rupture with meniscal injury | 6 | 0.4 | 0.04 (0.01 to 0.08) | 251 | 42 (11 to 75) | 38 (23–64) | 2 (1–2) | |
| PCL rupture with meniscal injury | 7 | 0.5 | 0.05 (0.02 to 0.09) | 343 | 49 (7 to 91) | 29 (8–94) | 2 (1–4) | |
| LCL rupture with meniscal injury | 4 | 0.3 | 0.03 (0.007 to 0.07) | 184 | 46 (0 to 100) | 49 (23–69) | 1 (0 to 2) | |
| Total | 52 | 3.4 | 0.3 (0.3 to 0.4) | 8505 | 164 (131 to 196) | 175 (44–264) | 55 (35 to 81) | |
| Chondral/ meniscus- cartilage | Medial meniscal tear | 28 | 1.8 | 0.2 (0.1 to 0.3) | 1387 | 50 (37 to 62) | 42 (27–65) | 9 (5–14) |
| Lateral meniscal tear | 78 | 5.1 | 0.5 (0.4 to 0.6) | 4402 | 56 (45 to 68) | 43 (18–95) | 28 (21 to 37) | |
| Medial and lateral meniscal tear | 1 | 0.1 | 0.01 (0.006 to 0.04) | 94 | 94 | 94 | 1 | |
| Meniscal tear—unspecified | 21 | 1.4 | 0.1 (0.1 to 0.2) | 1437 | 68 (29 to 108) | 23 (4–99) | 9 (4–14) | |
| Chondral injury, unspecified | 8 | 0.5 | 0.05 (0.02 to 0.10) | 237 | 30 (1 to 58) | 13 (4–54) | 2 (1–3) | |
| Lateral compartment chondral damage grade 1–2 | 7 | 0.5 | 0.05 (0.02 to 0.09) | 228 | 33 (0 to 74) | 11 (4–38) | 1 (0 to 3) | |
| Lateral compartment chondral damage grade 3–4 | 3 | 0.2 | 0.02 (0.004 to 0.06) | 389 | 130 (0 to 566) | 57 (2–330) | 3 (0 to 6) | |
| Lateral compartment chondral damage—ungraded | 7 | 0.5 | 0.05 (0.02 to 0.09) | 411 | 59 (0 to 158) | 17 (4–55) | 3 (0 to 6) | |
| Medial compartment chondral damage grade 1–2 | 8 | 0.5 | 0.05 (0.02 to 0.10) | 239 | 30 (14 to 46) | 27 (20–37) | 2 (1–2) | |
| Medial compartment chondral damage grade 3–4 | 1 | 0.1 | 0.01 (0.006 to 0.04) | 20 | 20 | 20 | <1 | |
| Medial compartment chondral damage—ungraded | 2 | 0.1 | 0.01 (0.001 to 0.04) | 79 | 40 (0–402) | 40 (11–68) | 1 (0 to 1) | |
| Degenerative osteoarthritis | 26 | 1.7 | 0.2 (0.1 to 0.2) | 1272 | 49 (18 to 80) | 20 (5–52) | 8 (3–15) | |
| Loose bodies | 11 | 0.7 | 0.07 (0.04 to 0.13) | 500 | 45 (13 to 78) | 24 (4–97) | 3 (2–5) | |
| Cartilage injury Other | 30 | 2.0 | 0.2 (0.1 to 0.3) | 1022 | 34 (16 to 52) | 12 (6–57) | 7 (4–10) | |
| Total | 231 | 15.2 | 1.5 (1.3 to 1.7) | 11 717 | 51 (43 to 59) | 29 (9–65) | 76 (58 to 94) | |
| Patellofemoral/extensor mechanism | Patellofemoral joint pain | 18 | 1.2 | 0.1 (0.1 to 0.2) | 283 | 16 (4 to 28) | 6 (5–10) | 2 (1–3) |
| Patellar tendinopathy | 20 | 1.3 | 0.1 (0.1 to 0.2) | 367 | 18 (9 to 28) | 13 (4–23) | 2 (1–4) | |
| Patellofemoral compartment chondral damage grade 1–2 | 5 | 0.3 | 0.03 (0.01 to 0.08) | 155 | 31 (0 to 71) | 11 (9–53) | 1 (0 to 1) | |
| Patellofemoral compartment chondral damage grade 3–4 | 2 | 0.1 | 0.01 (0.001 to 0.05) | 152 | 76 (0 to 279) | 76 (60–92) | 1 (1–1) | |
| Infrapatellar fat pad haematoma ± bursitis | 19 | 1.3 | 0.1 (0.1 to 0.2) | 361 | 19 (0 to 39) | 5 (4–11) | 2 (0 to 5) | |
| Infrapatellar fat pad inflammation | 16 | 1.1 | 0.1 (0.1 to 0.2) | 107 | 7 (4–9) | 5 (3-11) | 1 (0 to 1) | |
| Dislocated patella | 17 | 1.1 | 0.1 (0.1 to 0.2) | 2677 | 157 (86 to 229) | 90 (51–253) | 17 (11 to 24) | |
| Fractured patella | 7 | 0.5 | 0.05 (0.02 to 0.09) | 474 | 68 (38 to 97) | 68 (33–89) | 3 (2–4) | |
| Patellar tendon strain | 2 | 0.1 | 0.01 (0.001 to 0.05) | 24 | 12 (0 to 37) | 12 (10–14) | <1 | |
| Ruptured patellar tendon | 8 | 0.5 | 0.05 (0.02 to 0.10) | 1522 | 190 (113 to 267) | 160 (126–246) | 10 (7 to 13) | |
| Tibial tuberosity pathology | 3 | 0.2 | 0.02 (0.004 to 0.06) | 10 | 3 (0 to 9) | 2 (2-6) | <1 | |
| Quadricep tendon injury | 2 | 0.1 | 0.01 (0.001 to 0.05) | 35 | 18 (0 to 164) | 18 (6–29) | <1 | |
| Quadricep tendinopathy | 5 | 0.3 | 0.03 (0.01 to 0.08) | 22 | 4 (3–6) | 4 (4–5) | <1 | |
| Other patellofemoral/extensor mechanism | 28 | 1.8 | 0.2 (0.1 to 0.3) | 862 | 31 (0 to 64) | 8 (5–21) | 6 (1–12) | |
| Total | 152 | 10.0 | 1.0 (0.8 to 1.2) | 7051 | 46 (33 to 60) | 10 (5–49) | 46 (27 to 67) | |
| Soft tissue (periarticular) group | Knee haematoma | 113 | 7.4 | 0.7 (0.6 to 0.9) | 1138 | 10 (7 to 13) | 5 (3–10) | 7 (5–10) |
| Lacerated knee | 9 | 0.6 | 0.1 (0.03 to 0.1) | 151 | 17 (11 to 23) | 16 (13–23) | 1 (1–1) | |
| Other soft-tissue/ periarticular | 2 | 0.1 | 0.01 (0.001 to 0.05) | 20 | 10 (0 to 74) | 8 (5–21) | <1 | |
| Total | 124 | 8.2 | 0.8 (0.7 to 1.0) | 1309 | 11 (8 to 13) | 5 (4–12) | 8 (6–12) | |
| Other knee injury | Knee sprain/jar | 99 | 6.5 | 0.6 (0.5 to 0.8) | 1426 | 14 (8 to 21) | 5 (4–10) | 9 (5–15) |
| Iliotibial band syndrome | 10 | 0.7 | 0.1 (0.03 to 0.1) | 108 | 11 (7 to 15) | 12 (6–16) | 1 (0 to 1) | |
| Infected knee joint (superficial) | 3 | 0.2 | 0.02 (0.004 to 0.06) | 45 | 15 (0 to 42) | 15 (4–26) | <1 | |
| Knee joint synovitis | 33 | 2.2 | 0.2 (0.1 to 0.3) | 432 | 13 (7 to 19) | 5 (4–9) | 3 (1–5) | |
| Undiagnosed knee injury | 89 | 5.9 | 0.6 (0.5 to 0.7) | 2819 | 32 (21 to 43) | 12 (5–38) | 18 (11 to 27) | |
| Knee instability | 5 | 0.3 | 0.03 (0.01 to 0.08) | 204 | 41 (0 to 126) | 16 (5–17) | 1 (0 to 3) | |
| Baker’s cyst | 6 | 0.4 | 0.04 (0.01 to 0.08) | 70 | 12 (5 to 18) | 11 (6–19) | 1 (0 to 1) | |
| Other | 6 | 0.4 | 0.04 (0.01 to 0.08) | 199 | 33 (0 to 107) | 5 (5–6) | 1 (0 to 4) | |
| Total | 251 | 16.5 | 1.6 (1.4 to 1.8) | 5303 | 21 (16 to 26) | 8 (4–17) | 34 (23 to 50) | |
| Total match knee injuries | 1519 | 100 | 9.8 (9.3 to 10.3) | 75 666 | 50 (46 to 53) | 19 (6–57) | 490 (367 to 615) |