Table 1.
Basic characteristics of the included patients
| Demographic details | N (%)/M (range; IQR) † | Demographic details | N (%)/M (range; IQR) † | Demographic details | N (%)/M (range; IQR) † |
|---|---|---|---|---|---|
| Patients | 502 | ≤14 | 88(17.5%) | Yes | 18 (3.6%) |
| Sex | 14–25 | 101(20.1%) | Outerbridge grade | ||
| Male | 149 (29.7%) | 25–45 | 202(40.2%) | No lesion | 358 (71.3%) |
| Female | 353 (70.3%) | ≥45 | 111(22.1%) | Grade I | 29 (5.8%) |
| BMI (kg/m2) | 22.0 (range, 13.8 ~ 44.4; 4.3) | Symptoms duration (months) | 10.0 (range, 0.05 ~ 246; 21.0) | Grade II | 52 (10.4%) |
| < 18.5 | 54(10.8%) | ≤1 | 64(12.7%) | Grade III | 23 (4.6%) |
| 18.5–25 | 362(72.1%) | 1–6 | 149(29.7%) | Grade IV | 40 (8.0%) |
| ≥25 | 86(17.1%) | 6–24 | 184(36.7%) | K-L grade | |
| Work intensity | >24 | 105(20.9%) | Grade 0 | 375 (74.7%) | |
| Grade 0 | 27 (5.6%) | Watanabe type | Grade I | 56 (11.2%) | |
| Grade 1 | 212 (42.2%) | Complete | 423 (84.3%) | Grade II | 44 (8.8%) |
| Grade 2 | 240 (47.8%) | Incomplete | 79 (15.7%) | Grade III | 23 (4.6%) |
| Grade 3 | 22 (4.4%) | O’Connor type | Grade IV | 4 (0.8%) | |
| Grade 4 | 1 (0.2%) | No tear | 38 (7.6%) | Type of surgery | |
| Trauma history | Longitudinal (/bucket handle) tear | 171 (34.1%) | Saucerization | 410 (81.7%) | |
| No | 360 (71.7%) | Horizontal tear | 154 (30.7%) | Saucerization with repair | 16 (3.2%) |
| Yes | 142 (28.3%) | Oblique tear | 10 (2.0%) | Ttotal meniscectomy | 76 (15.1%) |
| Involved knee joint | Transverse (/radial) tear | 45 (9.0%) | Follow-up time (months) | 75.4 (range, 41.0 ~ 123.3; 33.7) | |
| Left | 252 (50.2%) | Variant tear | 84 (16.7%) | ≤60 | 135(26.9%) |
| Right | 250 (49.8%) | Medial meniscus tear | 60–96 | 254(50.6%) | |
| Age of onset (years) | 32.0 (range, 3 ~ 80; 26.3) | No | 484 (96.4%) | >96 | 113(22.5%) |
BMI body mass index, K-L grade Kellgren–Lawrence grade, DLM discoid lateral meniscus, IKDC International Knee Documentation Committee, † N number, M median, IQR interquartile range