Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mechanism of compensation of a progressive kyphosis. a Normal situation with a slight pelvis retroversion and C7 PL over the sacral endplate. b With a progressive loss of lordosis, pelvis retroversion permits maintaining C7 PL behind the femoral heads. c In case of severe kyphosis, hip extension (HE) limits the pelvis retroversion. It is compensated by flexion of the knees. C7 PL passes forward to the femoral heads. Due to the tilt of the femoral shaft, PT = PFA + HE
