TABLE 1.

Marker set and segment definitions for movement testing.

	Markers
Segment	1st	2nd	3rd
Lumbar Spine	S1	T12	L3 Lateral to L3
Pelvis	Anterior superior iliac spines	Posterior superior iliac spines	--
Thigh	Greater trochanter	Lateral & medial femoral condyle	Lateral Thigh Cluster
Shank	Lateral & medial femoral condyle	Lateral & medial malleolus	Lateral Shank Cluster

S1 = spinous process of the 1^st sacral vertebrae

T12 = spinous process of the 12^th thoracic vertebrae

L3 = spinous process of the 3^rd lumbar vertebrae

^*Lateral to L3 and thigh/shank clusters were used as additional tracking markers

^*All markers not on the spine were placed bilaterally