Abstract
Background
pelvis and soulder are deeply intergrated. They are connected by myofscial slings. The pelvic and spinal posture affects the position of the scapula and the activity of its muscles and also affects acromio-humeral distance and so that affects shoulder movement. The aim of the study was to investigate the influence of pelvic position on the shoulder range of motion.
Methods
The full active range of motion (flexion/extension, abduction, and external/internal rotation) of both shoulders was measured by digital goniometer for 33 normal adult subjects. Measurements were taken from standing position in the following pelvic positions: 1- Neutral posture, 2- Evoked anterior and posterior pelvic rotation, 3- Evoked right and left pelvic rotation, 4- Evoked right and left lateral pelvic tilt. For every shoulder movement, One Way ANOVA including Tukey post hoc test was used to compare between different positions.
Results
Anterior pelvic tilt leads to significant increase in flexion and significant decrease in extension of both shoulders (P value was < 0.001). Posterior pelvic tilt leads to the opposite. Pelvic rotation leads to significant decrease in shoulder flexion on the same side of rotation and shoulder extension on opposite side of rotation (P value was < 0.001). Lateral pelvic leads to significant decrease of abduction on the same side of lateral tilt (P value was < 0.001).
Conclusion
pelvic position affects shoulder range of motion