Smith et al developed a simple scale to grade the level of function following facial nerve injury. The authors are from Bristol Royal Infirmary and the Royal Infirmary in Edinburgh.
Regions observed:
(1) face during repose
(2) forehead while wrinkling
(3) eye
(4) mouth
Level of Normal Function
Scale
Points
0%
0
0
1 to 25%
I
1
26 to 50%
II
2
51 to 75%
III
3
76 to 100%
IV
4
where:
• The original table has overlaps at 0%, 25%, 50% and 75%. I adjusted the values so that there would be no overlap.
overall scale =
= SUM(points for all 4 regions) / 4
Interpretation:
• minimum scale: 0
• maximum scale: 4 (indicating normal function)
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