Anatomic radial axis
Anatomic radial axis
- Acronym: aRA
Definition
The anatomic radial axis is a landmark used to assess angular deformations of the radius and guide corrections.
In the frontal plane, the anatomic radial axis is determined from a craniocaudal radiograph or multiplanar reconstruction of the radius. Three lines perpendicular to the radius diaphysis are drawn at 25%, 50% and 75% of the total bone length. The anatomic radial axis connects the midpoints of these three lines.
In the sagittal plane, the anatomic radial axis is determined from a mediolateral radiograph or multiplanar reconstruction of the radius. Given the normal procurvatum of the radius in dogs, the anatomic radial axis cannot be drawn as a single straight axis. It is divided into two segments: the proximal anatomic radial axis and the distal anatomic radial axis.
References
Fox et al. (2006). Principles of Uniapical and Biapical Radial Deformity Correction Using Dome Osteotomies and the Center of Rotation of Angulation Methodology in Dogs. Veterinary Surgery;35:67–77. doi:10.1111/j.1532-950X.2005.00114.x
Fox J, Tomlinson JL. Principles of Angular Limb Deformity Correction. In: Tobias KM, Johnston SA, editors. Veterinary Surgery Small Animal. St Louis (MI): Elsevier Saunders; 2012. p.657-668.
Kwon et al. (2022). Evaluation of the radial procurvatum using the center of rotation of angulation methodology in chondrodystrophic. Dogs Front Vet Sci; 8:774993. doi: 10.3389/fvets.2021.774993