Grading systems
| Hip feature | Scale of grading system | Reference | |
| Labrum | 0=normal variant such as aplasia or hypoplasia 1=abnormal signal and/or fraying 2=simple tear 3=labrocartilage separation 4=complex tear 5=maceration | SHOMRI31 | |
| Articular cartilage (acetabular, femoral) | 0=no loss 1=partial thickness 2=full thickness loss | SHOMRI31 | |
| Subchondral bone marrow (acetabular, femoral) | Oedema 0=no lesion is present 1≤0.5 cm in size 2>0.5 cm but ≤1.5 cm 3>1.5 cm in size | Cysts 0=absent lesion 1≤0.5 cm in size 2>0.5 cm in size | SHOMRI31 |
| Tendons | 0=normal 1=tendinosis (intermediate signal, not fluid) 2=low-grade partial thickness tear (<50% tendon fluid signal) 3=high-grade partial thickness tear (≥50% tendon fluid signal) 4=full thickness tear (complete fluid signal) | Chi et al32 | |
| Ligaments | 0=normal 1=signal abnormalities or fraying 2=partial tear 3=complete tear | SHOMRI31 | |
| Other findings | Binary (present/absent) | – | |
Note: SHOMRI, scoring hip osteoarthritis with MRI. The labrum was assessed in four subregions: anterior, posterior, anterosuperior and superior. The articular cartilage and bone marrow were each divided in the acetabular region (four subregions: anterior, posterior, superolateral and superomedial) and femoral region (six subregions: anterior, posterior, lateral, superolateral, superomedial and inferior).