Point 90 (Ex-31 ) :
This point is located at the midpoint of the upper border of
knee-cap.

Point 91 (Ex-32) :
At the front of the knee, just below the knee-cap can be
seen two depressions (on either side of a rope-like structure).
Point 91 lies at the centre of the inner depression.

Point 92 (Ex-33) :
This point is located two thumb-widths vertically below
the point 22 (See page 79).