Introduction
Methods
Direct MR arthrography protocol
Sequence | Plane | Slice thickness (mm) | TR (ms) | TE (ms) | Field of view (mm2) | Acquisition matrix |
---|---|---|---|---|---|---|
T1 SE | Coronal | 3 | 480 | 15 | 200 | 512 × 512 |
T1 TSE | Sagittal | 4 | 786 | 12 | 200 | 512 × 512 |
T2 TIRM | Coronal | 4 | 4640 | 59 | 200 | 256 × 256 |
T2 DE3D | Coronal | 1.46 | 42 | 43 | 190 | 256 × 256 |
T2 DE3D | Sagittal | 1.7 | 23.56 | 6.533 | 180 | 320 × 320 |
PD TSE FS | Coronal | 3 | 2210 | 36 | 200 | 256 × 256 |
PD TSE FS | Transversal | 4 | 2470 | 36 | 200 | 256 × 256 |
Surgical technique
Direct MR arthrography evaluation
Statistical analysis
Results
Value | |
---|---|
Total no. of patients | 272 (274 hips) |
Laterality, n (%) | |
Left | 104 (38.0) |
Right | 170 (62.6) |
Sex, n (%) | |
Male | 174 (64) |
Female | 98 (36) |
Age, years | 39.9 ± 11.8 (18–75) |
Surgical results
n (%) | |
---|---|
Labral pathologies (Beck [22]) | 218(79) |
Grade 0 | 58 (21) |
Grade 1 (degeneration) | 54 (19.6) |
Grade 2 (full-thickness tear) | 46 (16.7) |
Grade 3 (detachment) | 108 (39.1) |
Grade 4 (ossification) | 10 (3.6) |
Acetabular chondral defects (ALAD [21]) | 192 (69) |
Grade 0 | 86 (31.1) |
Grade 1 | 58 (21.0) |
Grade 2 | 32 (11.6) |
Grade 3 | 62 (22.5) |
Grade 4 | 38 (13.8) |
Direct MR arthrography (dMRA) results
Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | Accuracy (95% CI) | |
---|---|---|---|---|---|
Investigator group 1 | 79% (73–84) | 18% (9–31) | 79% (76–81) | 18% (10–29) | 66% (60–72) |
Investigator group 2 | 83% (77–88) | 36% (23–50) | 83% (80–86) | 36% (26–47) | 74% (68–79) |
Investigator group 3 | 88% (83–92) | 53% (40–67) | 88% (95–91) | 54% (43–64) | 81% (76–85) |
Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | Accuracy (95% CI) | |
---|---|---|---|---|---|
Investigator group 1 | 81% (75–86) | 36% (26–46) | 71% (67–74) | 50% (40–60) | 66% (60–71) |
Investigator group 2 | 84% (78–89) | 38% (28–49) | 75% (72–79) | 52% (41–62) | 70% (64–75) |
Investigator group 3 | 91% (87–95) | 51% (40–62) | 81% (77–84) | 73% (62–82) | 79% (74–84) |
Pathology | Correct diagnosis (%) | ||
---|---|---|---|
Investigator group 1 | Investigator group 2 | Investigator group 3 | |
Labral pathologies | 79 | 83 | 93* |
p = 0.006 vs. Investigator group 1 and 2 | |||
Acetabular chondral lesions | 79 | 82 | 89* |
p = 0.006 vs. Investigator group 1 and 2 |