Table 2 Characteristics of the NHO
Number (%) | |
|---|---|
Location | |
Anterior | 8 (89%) |
Posterior | 3 (33%) |
Inferior | 3 (33%) |
External | 1 (11%) |
Circumferential extension | 2 (22%) |
Implantation | |
Anterior border of the ilium | 8 (89%) |
Gluteal surface of the ilium | 1 (11%) |
Ilio-pubic branch | 4 (44%) |
Ischio-pubic branch | 2 (22%) |
Greater trochanter | 4 (44%) |
Lesser trochanter | 3 (33%) |
Femoral diaphysis | 6 (67%) |
Fragmentation | |
Monofragmentary | 1 (11%) |
Multifragmentary | 8 (89%) |
Pseudarthrosis | 6 (67%) |
Density | |
Homogeneous | 5 (56%) |
Heterogeneous | 4 (44%) |
Borders | |
Sharp | 5 (56%) |
Ill-defined | 4 (44%) |
Relation to joint capsule | |
No involvment | 2 (22%) |
Contact | 7 (78%) |
Disruption | 0 (0%) |
Joint space | |
Normal | 8 (89%) |
Narrowed | 1 (11%) |
Ankylosis | 0 (0%) |
Bone mineralization | |
Normal (M1) | 1 (11%) |
Mild demineralization (M2) | 4 (45%) |
Significant demineralization (M3) | 3 (33%) |
Severe demineralization (M4) | 1 (11%) |
Femoral neck fracture | 0 (0%) |
Osteonecrosis of the femoral head | 1 (11%) |