Wessels et al used the length of the penis when flaccid and stretched to predict the penile length when erect. This can help counsel patients who request penile augmentation. The authors are from the University of California.
Flaccid Length in cm
Erect Length in cm
4
8
6
10.1
8
12.1
10
14.2
12
15.9
14
18.2
from Figure 2A
When this data is modeled in JMP, the following equation is derived:
erect length in cm =
= (1.007 * (flaccid length in cm)) + 4.019
or, the erect length is about 4 cm longer than the flaccid length on average. However, as shown in Figure 3 (page 996) the actual increase length for the individual patient showed wide variation.
Stretched Length in cm
Erect Length in cm
6
6.8
8
8.7
10
10.6
12
12.5
14
14.5
16
16.2
18
18.5
from Figure 2B
erect length in cm =
= (0.964 * (stretched length in cm)) + 0.97
or, the erect length is about 1 cm longer than the stretched length. The stretched length correlated much more closely with the erect length than did the flaccid length.
A patient should not be considered for penile lengthening unless:
(1) the flaccid length was less than 4 cm
(2) the stretched or erect length was less than 7.5 cm
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