Proximal anatomic radial axis
Proximal anatomic radial axis
- Acronym: PaRA
Definition
The proximal anatomic radial axis is a landmark used to assess angular deformities of the radius and guide corrections. 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.
The proximal anatomic radial axis is determined in the sagittal plane, from a mediolateral radiograph or multiplanar reconstruction of the radius. Two lines, perpendicular to the shaft of the radius, are drawn in the proximal third of the bone. The proximal anatomic radial axis connects the middle of these two lines.
The intersection between the proximal anatomic radial axis and the distal anatomic radial axis determines the Centre of Orientation of Angulation (CORA) of the radius.
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
