Austin's classification for ossicular chain defects depends on
Malleus head and stapes footplate
Malleus handle and stapes suprastructure
Malleus head and stapes suprastructure
Malleus head and stapes head
Austin in 1971 Classified ossicular defects based on malleus handle and stapes suprastructure into- Group A- having malleus and stapes intact and erosion of long process of incus being the most common defect. Group B - with only malleus and absent stapes. Group C - with only stapes and absent malleus. Group D - with absent malleus and stapes suprastructure. Ref- Glasscock-Shambaugh surgery of the ear, 5tg edition, PG 463-485.
Diagnostic and operative ENT