Sciatic nerve movement in the deep gluteal space during hip rotations maneuvers

Area of Science:

• Orthopedics
• Neurology
• Biomechanics

Background:

• The sciatic nerve's behavior in the subgluteal space during hip movements is not well understood.
• Retrotrochanteric pain is a common condition with multifactorial causes.

Purpose of the Study:

• To investigate the behavior of the sciatic nerve during passive hip rotation and isometric muscle contractions.
• To explore the potential relationship between sciatic nerve mechanics and retrotrochanteric pain.

Main Methods:

• Ultrasound imaging was used to assess sciatic nerve changes in 58 healthy volunteers.
• Nerve curvature and displacement were analyzed using MATLAB software during specific hip movements and isometric contractions.
• Evaluated longitudinal and axial nerve movements during passive and active hip rotation.

Main Results:

• Passive internal hip rotation and isometric external rotator contraction significantly increased sciatic nerve curvature.
• Passive external hip rotation and isometric internal rotator contraction flattened the sciatic nerve's curve.
• Sciatic nerve displacement occurred during passive movements, with less displacement during isometric contractions.

Conclusions:

• Hip rotation and isometric muscle contractions influence sciatic nerve behavior in the subgluteal region.
• Sciatic nerve mechanics, including shear effects and mechanosensitive stress, may play a role in retrotrochanteric pain.