Sacroiliac kinematics for reciprocal straddle positions.
METHODS
A descriptive and correlation approach was used to assess joint motion.


OBJECTIVE
Magnitudes and directions of sacroiliac motion were examined from three different upright postural conditions.


BACKGROUND
Evidence and clinical views suggest that sacroiliac motion available in the normal case is extremely small to nonexistent.


METHODS
Systems for standardizing the three postures and the Metrecom skeletal analysis system (Metrecom, Faro Technologies, Inc., Lake Mary, FL) for acquiring coordinate data for selected skeletal landmarks.


RESULTS
The complete sacroiliac oblique-sagittal motion that occurred between the right forward and left forward stride positions was 9 degrees (SD 6.5). The composite oblique-transverse motion was 5 degrees (SD 3.9). The motions in each plane were significantly different from zero. A joint mobility relationship existed between the hip and sacroiliac joints.


CONCLUSIONS
The results demonstrate that substantial angular motion is possible at the sacroiliac joints.
Smidt
G L
GL
Physical Therapy Graduate Program, College of Medicine, University of Iowa, Iowa City, USA.
McQuade
K
K
Wei
S H
SH
Barakatt
E
E
D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D010388:Pelvis / Q000502:physiology; D011187:Posture / Q000502:physiology; D012446:Sacroiliac Joint / Q000502:physiology*