Score |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
Norbert Angle |
+15° and over |
+10° to +14° |
=5° to +9° |
0° to +4° |
-1° to -5° |
-6° to -10° |
-11° and over |
Subluxation |
Femoral head well centred in acetabulum |
Femoral head centre lies medial to DAE.
Lateral or medial joint space diverges slightly |
Femoral head centre superimposed on DAE. Medial joint space increase obvious |
Femoral head centre just lateral ti DAE. 1/2 femoral head within acetabulum |
Femoral head centre clearly lateral to DAE. |
Femoral head centre well lateral to DAE. Femoral head just touches DAE |
Complete pathological dislocation |
Cran. Acetabulum Edge
CrAE |
even curve, parallel to femoral head troughout |
Lateral or medial 1/4 CrAE flat.
Lateral or medial joint space diverges sligjtly |
CrEA flat throughout most of its length |
CrAE shows slight bilabiation |
1/4 femoral head within acetabulum |
CrAE shows gross bilabiation |
Entire CrAE slopes cranially |
Dorsal Acetabulum Edge
DAE |
DAE has slight surve |
Loss of S-curve only in the presence of other dysplastic change |
Very small exostosis on cran. DAE |
Obvious exostosis on DAE; especially cran. and/or minor "loss if edge" |
CrAE shows moderate bilabiation |
Marked exostosis all along DAE and/or gross "loss of edge" |
Masive exostosis from cranial to caudal DAE |
Cran. Effective Acetabulum Rim
Cr.EAR |
Sharp, clear-cut junction of DAE & CrAE |
Indistinct junction of DAE & CrAE |
Very small exostosis or very small facet |
Facet and/or small exostosis and/or slight bilabiation |
Exostosis well lateral to DAE and/or moderate "loss of edge" |
Gross exostosis and/or facet and/or gross bilabiation |
Complete remodelling of CrEAR. Massive exostosis and/or gross facet |
Acetabular Fossa
AF |
A fine bone line curves medial and caudal from causal end of CrEA |
Slight increase in bone density medial to AF. "Fine line" hazy or lost |
Fine line lost ind AF and vetral AF hazy due to new bone. Notch at CaAE clear |
Incomplete remodelling of acetabulum with medial face lateral to AF. Ventral AE lost. AF hazy. Notch irregular |
Obvious facet and/or obvious exostosis and/or moderate bilabiation |
Gross remodelling. Dense new bone troughout acetabulum. CaAE notch lost and AF obscurred |
Complete remodelling and new articular surface, well lateral ti AF. Notch lost |
Caudal Acetabular Edge
CaAE |
Clean line |
Small exostosis at lateral CaAE |
Small exostosis at lateral an medial CaAE |
Large exostosis an narrow notch at CaAE |
Marked exostosis and "hooking" of lateral end of CaAE |
Gross distorsion due to mass of new bone in acetabulum. Notch completely lost |
Void |
Femoral Head/Neck Exostosis |
Smooth rounded profile |
Slight exostosis in "ring form" and/or dense vertical bony line adjacent to trochanteric Fossa ("Morgan Line") |
Slight exostosis visible on skyline and/or density on medial femoral head. |
Distinct exostosis in "ring formation" |
Obvious complete collar of exostosis |
Massive exostosis giving mushroom appearance |
Massive exostosis and infill of trochanteric fossa and below femoral head |
Femoral Head Recontouring |
Nil |
Femoral head does not fit in circel due to exostosis or bone loss. |
Some bone loss and/or femoral head/neck ring of exostosis |
Obvious loss and distinct exostosis giving slight conical appearance |
Gross remodelling. Obvious bone loss and exostosis gives mushroom appearance |
Very gross remodelling with marked bone loss and much new one |
Femoral head improperly shaped due to maldevelopment or femoral head centre |