Is the canal flare index a reliable means of estimation of canal shape? Measurement of proximal femoral geometry by use of 3D models of the femur

Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association
Kaneaki TawadaTakanobu Otsuka

Abstract

The canal flare index (CFI; the ratio of the diameter of the femoral canal at the isthmus in the anteroposterior (A-P) view to the diameter of the medullary canal 20 mm above the lesser trochanter) is often used as a canal characteristic. Clinically, however, CFI measurements are sometimes untrustworthy because of femoral rotation and, especially, greater anteversion among Japanese patients. Our objectives were to analyze femoral geometry, by use of 3D CAD models, to evaluate the effects of rotational error, and to seek an index less affected by rotation. Computed axial tomography (CAT) scan data from 60 femurs were used. By use of CAD software, 3D femoral models were created. The outside of the femur and the inside canal width 20 mm (P20) and 10 mm proximal (P10), and 10 mm (D10), 20 mm (D20), 30 mm (D30), and 40 mm (D40) distal from the center of the lesser trochanter, and at the isthmus were measured for different angles of femoral rotation. CFI, FFI (femoral flare index; the ratio of the extra-cortical diameters at the same levels as for the CFI), and other canal ratios (P20/D10, P20/D20, P20/D30, and P20/D40) were then calculated and the effect of rotational errors was investigated. Mean CFI, FFI, P20/D10, P20/D20, P20/D30...Continue Reading

References

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Citations

Jan 14, 2017·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Chad S MearsJohn G Skedros
Dec 24, 2019·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Thies WuestemannDavid C Markel
Nov 15, 2017·Archives of Orthopaedic and Trauma Surgery·Peter BrumatBlaž Mavčič

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