Grading a Perforation or Rupture of the Tympanic Membrane (TM)

A rupture of the tympanic membrane can be graded based on its extent.

Parameters:

(1) type of injury

(2) length

(3) size of perforation as percent of tympanic membrane

area of the tympanic membrane in square mm =

= PI() * ((diameter in mm)^2) / 4

Type of Injury	Length	Size as Percent of Tympanic Membrane	Grade
pinpoint	NA	NA	1
linear tear	< 2 mm	NA	1
linear tear	>= 2 mm	NA	2
NA	NA	1 - 25%	2
NA	NA	25 - 50%	3
NA	NA	> 50%	4

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