Table 2:

System of Jahrsdoerfer et al for preoperative evaluation of aural atresia and stenosis as assessed using high-resolution CT of the temporal bonea

Stapes present210Excellent
Oval window19Very good
Round window18Good
Middle ear space17Regular
Mastoid pneumatization16Borderline
Facial nerve course1≤5Poor
Malleus-incus complex1
Incus-stapes articulation1
Auricle appearance1
  • a The percentage of successful surgeries corresponds roughly with the rating scale (ie, score of 8 equals approximately 80% chance of postoperative hearing at normal or near-normal levels). Adapted from Jahrsdoerfer et al, 1992.34