New fluoroscopic imaging technique for investigation of 6DOF knee kinematics during treadmill gait.
BACKGROUND
This report presents a new imaging technique for non-invasive study of six degrees of freedom (DOF) knee kinematics during treadmill gait.


METHODS
A treadmill was integrated into a dual fluoroscopic imaging system (DFIS) to formulate a gait analysis system. To demonstrate the application of the system, a healthy subject walked on the treadmill at four different speeds (1.5, 2.0, 2.5 and 3.0 MPH) while the DFIS captured the knee motion during three strides under each speed. Characters of knee joint motion were analyzed in 6DOF during the treadmill walking.


RESULTS
The speed of the knee motion was lower than that of the treadmill. Flexion amplitudes increased with increasing walking speed. Motion patterns in other DOF were not affected by increase in walking speed. The motion character was repeatable under each treadmill speed.


CONCLUSIONS
The presented technique can be used to accurately measure the 6DOF knee kinematics at normal walking speeds.
Li
Guoan
G
Bioengineering Laboratory, GRJ 1215, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA. gli1@partners.org.
Kozanek
Michal
M
Hosseini
Ali
A
Liu
Fang
F
Van de Velde
Samuel K
SK
Rubash
Harry E
HE