Fig 1.
Radiologic measurement parameters.
Definition of all continuous variables and radiologically measured parameters.
Table 1.
Logistic regression for hearing outcome ≥20dB.
Table 2.
ROC (receiver operator characteristics) curves.
Fig 2.
Receiver operator characteristics (ROC) curve.
ROC curve for all 4 radiological parameters. The best predictive parameter was the distance between the 2 axes [mm], which yielded a curve bending toward the left top corner. Curves along the diagonal line, such as the parameter “malleus-incus axis angle ‘β’” reflect a random guess and are not discriminative with respect to hearing outcome.
Fig 3.
Computed tomography examples of malleus-incus axis distance ‘D’.
Panel A, B and C shows a computed tomography (at index visit) of the incudomalleolar joint from 3 patients and the distances ‘D’ (mm) between the malleus axis and incus axis for grade I, II and III and the corresponding hearing outcome (pure tone average (PTA) of the air bone gap), dB HL) 1–3 months after trauma. The image in panel C was horizontally flipped for better visualization.
Table 3.
New classification system of ossicular chain dislocation.