Greater trochanter location measurement using a three-dimensional motion capture system during prone hip extension

Area of Science:

• Biomechanics
• Orthopedics
• Kinesiology

Background:

• The greater trochanter (GT) is a critical anatomical landmark in biomechanical research.
• Current measurement techniques for the GT, particularly marker-based methods (GT-m), require refinement for improved accuracy and precision.

Purpose of the Study:

• To introduce and evaluate a novel non-invasive measurement technique for the greater trochanter (No GT-m).
• To compare the accuracy and precision of the No GT-m method against the conventional GT-m method.

Main Methods:

• Twenty healthy subjects participated in the study.
• Kinematic data were collected using a motion capture system during prone hip extension exercises.
• Greater trochanter locations were calculated using both GT-m and No GT-m measurement techniques.

Main Results:

• The No GT-m method demonstrated a significantly lower coefficient of variation for GT migration distance compared to GT-m.
• Thigh lengths measured by the No GT-m method were comparable to original measurements.
• Significant differences were observed between the GT-m method and other measurement approaches.

Conclusions:

• The GT-m method exhibits lower precision and underestimates GT migration distance.
• The No GT-m method provides measurements of thigh length that closely align with original values.
• Determining greater trochanter location using the No GT-m technique offers superior accuracy over the GT-m method.