Proximal anatomic femoral axis - Dog - axes and angles - Thigh bone [Femur] - vet-Anatomy
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Proximal anatomic femoral axis

Proximal anatomic femoral axis

  • Acronym: PaFA

Definition

Stephan Mahler

The proximal anatomic femoral axis is a landmark used to assess angular deformities of the femur and provide guidance for corrections. It is determined in the sagittal plane from a mediolateral radiograph of the entire femur. The position is considered acceptable when the medial condyle and the lateral condyle are superimposed.

A first line is drawn between the lesser trochanter and the proximal part of the trochlea of femur. This line divides the femur into 4 identical segments. In the proximal segment, two lines are drawn perpendicular to the diaphysis of the femur. The proximal anatomic femoral axis connects the midpoints of these two lines.

References

  • Yasukawa S, Edamura K, Tanegashima K, Seki M, Teshima K, Asano K, Nakayama T, Hayashi K. Evaluation of bone deformities of the femur, tibia, and patella in Toy Poodles with medial patellar luxation using computed tomography. Vet Comp Orthop Traumatol. 2016;29(1):29-38. doi: 10.3415/VCOT-15-05-0089. Epub 2015 Dec 7.

  • Phetkaew T, Kalpravidh M, Penchome R, Wangdee C. A Comparison of Angular Values of the Pelvic Limb with Normal and Medial Patellar Luxation Stifles in Chihuahua Dogs Using Radiography and Computed Tomography. Vet Comp Orthop Traumatol. 2018 Feb;31(2):114-123. doi: 10.3415/VCOT-17-05-0067. Epub 2018 Mar 13. Erratum in: Vet Comp Orthop Traumatol. 2018 Feb;31(2):a1.

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