Tensor Fasciae Latae and Gluteus Maximus Muscles: Do They Contribute to Hip Abduction?
Armando Hoch1, Dimitris Dimitriou1, Jessica Wolf-Wettstein1
1Balgrist University Hospital, University of Zurich, Zurich, Switzerland.
Summary
Hip abductor weakness impacts hip function. The gluteus maximus (Gmax) is a key hip abductor, significantly reducing abduction force when weakened. The tensor fasciae latae (TFL) has minimal impact.
Area of Science:
- Biomechanics
- Human Physiology
- Musculoskeletal Research
Background:
- Hip abductor muscles are crucial for maintaining pelvic stability and lower limb function during activities like walking and running.
- Understanding the specific contribution of each hip abductor muscle to overall abduction force is essential for diagnosing and treating hip weakness.
Purpose of the Study:
- To investigate the individual effects of experimentally induced weakness in the tensor fasciae latae (TFL), gluteus medius and minimus (Gmed/min), and gluteus maximus (Gmax) on hip abduction force.
- To determine the relative importance of these muscles as hip abductors across different hip positions.
Main Methods:
- Ten participants underwent sequential nerve blocks targeting the TFL, Gmed/min, and Gmax muscles.
- Hip abduction force was measured in the lateral decubitus position with the hip in three sagittal planes: 30° flexion, neutral, and 30° extension.
Main Results:
- Weakness of the TFL resulted in a minor reduction (15%) in abduction force, specifically in 30° hip flexion, indicating limited contribution as a primary abductor.
- Induced weakness of the Gmax significantly reduced hip abduction force, particularly in flexion (43%-56% reduction depending on hip position), highlighting its substantial role.
- The Gmed/min consistently showed a significant reduction in abduction force across all tested hip positions when its function was impaired.
Conclusions:
- The gluteus maximus (Gmax) is a highly relevant hip abductor, with its weakness significantly impacting abduction strength, especially in hip flexion.
- The tensor fasciae latae (TFL) plays a minor role in hip abduction force generation, with its contribution being position-dependent and less significant than the Gmax.
- Targeted strengthening of the gluteus maximus and gluteus medius/minimus is critical for addressing hip abduction weakness and improving overall hip function.
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