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Femoral anteversion.

S B Murphy¹, S R Simon, P K Kijewski

¹Department of Orthopedic Surgery, Children's Hospital Medical Center, Boston, Massachusetts 02115.

The Journal of Bone and Joint Surgery. American Volume

|October 1, 1987

Summary

Current computerized tomography (CT) methods for measuring femoral anteversion are inaccurate, underestimating by 10 degrees. A new CT method offers improved accuracy for this crucial hip joint measurement.

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Area of Science:

Orthopedics
Medical Imaging
Biomechanical Engineering

Background:

Femoral anteversion is commonly measured using roentgenographic techniques.
Recent computerized tomography (CT) methods lack adherence to geometric definitions and have unverified accuracy.
Existing CT methods may not provide precise measurements for clinical applications.

Purpose of the Study:

To evaluate the accuracy and reproducibility of the current computerized tomography (CT) method for measuring femoral anteversion.
To develop and validate a novel, geometrically consistent CT method for measuring femoral anteversion.
To provide a more accurate and reliable CT-based measurement for clinical use.

Main Methods:

Testing the current widely used CT method on thirty-two femoral specimens.
Comparing CT measurements with direct measurements to assess accuracy.
Developing a new CT method based on precise geometric definitions of the femoral neck axis.
Validating the new CT method's accuracy on the same femoral specimens.

Main Results:

The current CT method consistently underestimated femoral anteversion by an average of 10 degrees.
The current CT method demonstrated poor reproducibility, with results varying by +/- 3.6 degrees.
The newly developed CT method achieved accuracy within +/- 1 degree.
Geometric analysis revealed inconsistencies between the current CT method's point selection and the definition of anteversion.

Conclusions:

The prevalent CT method for measuring femoral anteversion is geometrically inconsistent and inaccurate.
A novel CT method offers superior accuracy and reproducibility for measuring femoral anteversion.
The new method, which accurately defines the femoral neck axis, is recommended for clinical practice.

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