Evaluation of Q angle in differents static postures

Area of Science:

• Biomechanics
• Kinesiology
• Orthopedics

Background:

• The Q angle is a critical indicator of lower limb alignment.
• Understanding variations in Q angle across different positions is essential for diagnosing and managing musculoskeletal conditions.
• Previous research has not comprehensively evaluated Q angle changes with lower limb rotation in various postures.

Purpose of the Study:

• To compare the Q angle values in different lower limb positions, including external and internal rotations.
• To investigate the influence of posture and foot rotation on Q angle measurements.
• To assess potential gender-specific differences in Q angle responses to positional changes.

Main Methods:

• A descriptive cross-sectional study involving 62 healthy sedentary volunteers (32 women, 30 men).
• Q angle was measured using computerized biophotogrammetry (ALC image 2.1 program).
• Measurements were taken in three positions: supine with feet parallel, supine with feet abducted (external rotation), and standing with feet parallel and abducted.

Main Results:

• Significant differences in Q angle were observed between standing with parallel feet and standing with abducted feet on the left side for both genders (p = 0.000).
• Females showed a significant difference between supine and standing positions with abducted and parallel feet on the left side (p = 0.046).
• No significant differences were found between supine positions with parallel and abducted feet.

Conclusions:

• The Q angle exhibits significant variations depending on whether the lower limb is in a standing or supine position, particularly with foot abduction.
• Lower limb symmetry is maintained in the supine posture, irrespective of limb rotation.
• These findings highlight the importance of considering posture and foot position when evaluating the Q angle for diagnostic purposes.