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Sacroiliac kinematics for reciprocal straddle positions
G L Smidt1, K McQuade, S H Wei
1Physical Therapy Graduate Program, College of Medicine, University of Iowa, Iowa City, USA.
Spine
|May 1, 1995
Summary
Substantial angular motion is possible at the sacroiliac joints, challenging previous beliefs of minimal movement. This study quantifies sacroiliac joint motion during upright postures.
Area of Science:
- Biomechanics
- Human Anatomy
- Kinesiology
Background:
- Existing evidence suggests minimal to no sacroiliac joint motion in healthy individuals.
- Clinical perspectives often view the sacroiliac joint as having very limited mobility.
Purpose of the Study:
- To examine the magnitudes and directions of sacroiliac joint motion.
- To investigate motion across three distinct upright postural conditions.
Main Methods:
- Employed a descriptive and correlational approach to assess joint motion.
- Utilized the Metrecom skeletal analysis system for coordinate data acquisition.
- Standardized three specific upright postures for data collection.
Main Results:
- Significant angular motion was observed in the sacroiliac joints during stride positions (oblique-sagittal: 9 degrees, oblique-transverse: 5 degrees).
- Motions in each measured plane were statistically significant, differing from zero.
- A correlation in joint mobility was identified between the hip and sacroiliac joints.
Conclusions:
- The findings demonstrate that considerable angular motion can occur at the sacroiliac joints.
- This challenges the long-held notion of extremely limited sacroiliac joint mobility.