Prosthetic Leg Has Powered Joints
From: Laboratory Equipment - 08/24/2011

A new prosthetic design is the first to include powered knee and ankle joints
that move in unison, making it much easier for an amputee to walk, sit,
stand, and climb. It also allows amputees to walk without the leg-dragging
gait characteristic of conventional artificial legs. 

Read the entire article and view a video at:
http://www.laboratoryequipment.com/news-Prosthetic-Leg-Has-Powered-Joints-082411.aspx

Links:
‘Bionic’ limb moves like natural leg
https://www.futurity.org/science-technology/bionic-limb-moves-like-natural-leg/

Michael Goldfarb
http://frontweb.vuse.vanderbilt.edu/vuse_web/directory/facultybio.asp?FacultyID=21262

Development of a Powered Transfemoral Prosthesis
http://research.vuse.vanderbilt.edu/cim/research_leg.html

Lower-Limb Prosthetic Helps Amputees Walk Without Leg-Dragging Effects
http://www.ptproductsonline.com/SOAPNotes/2011-09-14_05.asp