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Computed tomography in the determination of leg geometry
T Pfeifer1, R Mahlo, M Franzreb
1Department of Diagnostic Radiology, University of Ulm, Germany.
In Vivo (Athens, Greece)
|May 1, 1995
Summary
Computed tomography (CT) accurately measures lower limb torsional angles in adults. Standardized scan locations are crucial for reliable femoral and tibial torsion measurements in clinical settings.
Area of Science:
- Orthopedics
- Radiology
- Biomechanics
Background:
- Lower limb malalignment affects gait and joint health.
- Accurate measurement of femoral and tibial torsion is essential for diagnosis and treatment planning.
- Computed tomography (CT) is a common imaging modality for assessing bone morphology.
Purpose of the Study:
- To determine normal torsional angles of the femur and tibia in adults using CT.
- To assess the variability and reliability of CT-based torsion measurements.
- To establish standardized CT scan locations for accurate torsion assessment.
Main Methods:
- Computed tomography (CT) scans were performed on 286 adults with lower limb malalignment.
- Femoral and tibial length and torsional angles were measured.
- Axial scan locations were varied to assess their impact on measurements.
- Normal torsion values and intraindividual side differences were calculated.
Main Results:
- Normal femoral antetorsion: 23.5 +/- 8.6 degrees (internal).
- Normal tibial external torsion: 34.9 +/- 8.6 degrees.
- Femoral torsion measurements varied significantly based on axial scan location.
- Mean intraindividual side differences were 4 degrees, with 95% confidence intervals of 11.0 degrees (femur) and 12.3 degrees (tibia).
Conclusions:
- CT can determine femoral and tibial torsional angles.
- Standardized and reproducible axial scan locations are mandatory for reliable CT-based torsion measurements.
- Establishing precise CT protocols is vital for clinical application in lower limb malalignment.