The Relationship Between Foot and Pelvic Alignment While Standing.

Area of Science:

• Biomechanics
• Human Movement Analysis
• Orthopedics

Background:

• Normal motion and segmental interrelationships are vital for function.
• The connection between distal lower extremity segments and pelvic alignment requires further study.

Purpose of the Study:

• To investigate the interrelationship between distal and proximal lower extremity segments.
• To examine changes in pelvic and lower extremity alignment during induced feet hyperpronation.

Main Methods:

• Utilized a VICON 612 computerized motion analysis system in a gait laboratory.
• Recruited 35 healthy volunteers for four randomized standing conditions (floor and three wedges at 10°, 15°, 20°).
• Induced bilateral hyperpronation for 20 seconds in each wedge condition.

Main Results:

• A significant relationship (p<0.05) was observed between anterior pelvic tilt and thigh internal rotation across all positions (r=.41–.46).
• The shank segment significantly mediated pelvic alignment, connecting foot and thigh segments.
• Internal rotation of the shank was associated with calcaneal eversion, thigh internal rotation, and anterior pelvic tilt.

Conclusions:

• The shank is a pivotal segment for postural adjustment in response to induced hyperpronation.
• Internal shank rotation influences thigh rotation and pelvic tilt, highlighting its role in lower extremity kinetic chain.
• Understanding these interrelationships is crucial for assessing and managing postural stability.