Posterior Pelvic Tilt Allows for Increased Hip Motion, While Anterior Pelvic Tilt Decreases Joint Stress: A Systematic Review of Biomechanical and Motion Analyses.
Authors
Kuhns BD, Kahana-Rojkind AH, Parsa A, McCarroll TR, Sikligar D, Domb BG
Background
Pelvic tilt influences hip joint mechanics and may affect treatment outcomes in patients with femoroacetabular impingement (FAI) and acetabular dysplasia. However, the relationship between pelvic alignment and joint stress or motion is not fully understood.
Methods
A systematic review of 14 biomechanical and motion analysis studies (577 hips from 474 patients) evaluated how pelvic tilt affects joint contact forces and range of motion. Methodological quality was assessed using MINORS and ROBINS-I.
Key Findings
- In dysplastic hips: Posterior pelvic tilt reduced joint contact area and femoral head coverage but increased contact pressure.
- In FAI patients: Posterior tilt increased internal rotation and total hip range of motion.
- FAI patients had restricted posterior pelvic tilt during movement compared to control subjects.
- Anterior tilt was associated with reduced impingement-free motion.
Conclusion
Posterior pelvic tilt improves range of motion in FAI but increases joint stress in dysplastic hips. Understanding these differences is essential for diagnosis, rehabilitation, and surgical planning.
What Does This Mean For Patients
Your pelvic alignment affects how your hip moves and how much stress it absorbs. If you have hip impingement or dysplasia, adjusting your posture or pelvic positioning during exercises or daily activities could relieve symptoms and improve function.