In 1992, Jahrsdoerfer et al developed a 10-point grading system to determine surgical candidacy based on key features from the CT scan and the appearance of the external ear.
• This scheme is also used to indirectly estimate the likelihood of success if surgical correction is performed.
• Most Dr’s will only operate on patients with scores of 7 or higher.
• As a reflection of the conservative nature of this grading system, a score of 10 is never given.
The following is a summary of this 10-point grading system:
Stapes present = 2 points
Oval window open = 1 point
Middle ear space = 1 point
Facial nerve = 1 point
Malleus-incus complex = 1 point
Mastoid pneumatization = 1 point
Incus-stapes connection = 1 point
Round window = 1 point
External ear appearance = 1 point