Equations of Englesbe et al for Determining a Patient's Morphometric Age Prior to Surgery

 

Analysis: CT scan

 

Parameters:

(1) gender

(2) total left and right psoas muscle cross-sectional area in square mm at level of L4

(3) psoas muscle density in Hounsfield Units (HU)

(4) calcification of the infra-renal abdominal aorta in percent (from 0 to 100)

 

For a male:

 

morphometric age =

= (0.588 * (percent aortic calcification)) - (0.006 * (psoas area)) - (0.397 * (psoas density)) + 87.56

 

For a female:

 

morphometric age =

= (0.62 * (percent aortic calcification)) - (0.012 * (psoas area)) - (0.461 * (psoas density)) + 93.39

 

The morphometric age correlated with postoperative mortality and length of stay better than the chronological age.