A new method for measurement of femoral anteversion. A comparative study with other radiographic methods

Area of Science:

• Orthopedics
• Radiology
• Biomechanical Engineering

Background:

• Femoral anteversion is a critical parameter in hip joint biomechanics.
• Existing measurement methods like the Magilligan method have limitations.
• Accurate assessment of femoral anteversion is vital for diagnosing and managing pediatric and adult hip conditions.

Purpose of the Study:

• To introduce and evaluate a new biplanar radiographic method for measuring femoral anteversion.
• To compare the accuracy of the novel method against the Magilligan method and CT scans.
• To assess the clinical applicability and advantages of the proposed biplanar technique.

Main Methods:

• A modified biplanar technique involving true anteroposterior and translateral radiographs of the femur.
• Measurement of specific angles (alpha and gamma) on radiographs and calculation of anteversion angle (gamma') using a trigonometric formula.
• Comparative analysis of femoral anteversion measurements in adult dried femora and pediatric femora using the new method, Magilligan method, and CT.

Main Results:

• Both Magilligan and the authors' biplanar methods tended to overestimate femoral anteversion compared to direct measurement in dried femora.
• Conventional CT methods showed a tendency to underestimate femoral anteversion.
• Significant differences (p < 0.05) were observed between the three measurement methods in both adult and pediatric samples.

Conclusions:

• The proposed biplanar method for measuring femoral anteversion is marginally more accurate than the conventional Magilligan method.
• The new technique offers practical clinical advantages, including easier patient positioning and better rotation control.
• This biplanar approach provides a potentially more reliable and efficient tool for assessing femoral anteversion in clinical settings.