Introduction
Materials and methods
Radiological measurements
Inter- and intra-observer reliability
Statistical analysis
Results
ACL injury (n = 65) | Controls (n = 53) | p value | |
---|---|---|---|
Male gender (%) | 43 (66.2%) | 32 (60.4%) | n.s. |
Mean age in years (SD) | 25.4 (± 6.7) | 32.5 (± 9.2) | < 0.001 |
Sport trauma | 57 (87.7%) | 9 (17.0%) | < 0.001 |
Football | 30 (46.2%) | 3 (5.7%) | |
Hockey | 9 (13.8%) | 3 (5.7%) | |
Tennis | 1 (1.5%) | 1 (1.9%) | |
Other | 17 (26.2%) | 2 (3.8%) | |
Medial meniscal injury | 15 (23.1%) | 36 (67.9%) | < 0.001 |
Lateral meniscal injury | 26 (40.0%) | 12 (22.6%) | n.s |
Depth of LFNS | |||
Median (range) | 0.8 mm (0–3.1 mm) | 0.0 mm (0–1.4 mm) | 0.008 |
Category | |||
0.0 mm | 9 (13.8%) | 27 (50.9%) | < 0.001 |
0.1–1.0 mm | 32 (49.2%) | 25 (47.2%) | |
1.1–1.4 mm | 14 (21.5%) | 1 (1.9%) | |
≥1.5 mm | 10 (15.4%) | 0 (0%) | |
Location | |||
Median (range) | 9 mm (0–19 mm) | 0 mm (0–17 mm) | < 0.001 |
Category | |||
0 mm | 14 (21.5%) | 30 (56.6%) | < 0.001 |
1–10 mm | 24 (36.9%) | 17 (32.1%) | |
>10 mm | 27 (41.5%) | 6 (11.3%) |
Radiological assessment
Cut-off values | PPV (%) | NPV (%) | Sensitivity (%) | Specificity (%) |
---|---|---|---|---|
LFNS ≥ 1.5 mm | 100 | 49.1 | 15.4 | 100 |
LFNS > 1.0 mm | 96.0 | 55.9 | 36.9 | 98.1 |
Location > 10 mm | 81.8 | 55.3 | 41.5 | 88.7 |
Combination LFNS > 1.0 mm AND location > 10 mm OR LFNS ≥ 1.5 mm | 100 | 53.0 | 27.7 | 100 |
LFNS > 1.0 OR location > 10 mm | 83.3 | 60.5 | 53.9 | 86.8 |
Inter- and intra-observer agreement
Measurement in mm | Single measures | 95% CI | F (df1, df2) | p value |
---|---|---|---|---|
Inter-observer agreement (ICC) | ||||
LFNS depth | 0.93 | 0.91–0.95 | 54.81 (117, 351) | < 0.001 |
Location | 0.64 | 0.55–0.72 | 8.64 (116, 348) | < 0.001 |
Combination of location and depth | 0.80 | 0.75–0.85 | 17.54 (117, 351) | < 0.001 |
Intra-observer agreement (ICC) | ||||
LFNS Depth | 0.96 | 0.94–0.97 | 48.36 (117, 117) | < 0.001 |
Location | 0.59 | 0.45–0.70 | 3.98 (117, 117) | < 0.001 |
Combination of location and depth | 0.84 | 0.78–0.89 | 11.66 (117, 117) | < 0.001 |