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.
Knee joint non-orthogonal coordinate system. The flexion/ extension axis (Y) is fixed to the thigh (proximal segment), the internal/external rotation axis (Z) is fixed to the shank (distal segment), and the abduction/ adduction axis (X) is perpendicular to these two axes.
