Anatomic caudal proximal radial angle

The anatomic caudal proximal radial angle (aCrPRA) is a landmark used to assess angular deformities of the radius and provide guidance for corrections. It is determined from a mediolateral radiograph, or multiplanar reconstructed CT images of the radius

The anatomic caudal proximal radial angle is measured between the proximal anatomic radial axis and the proximal radial joint orientation line in the sagittal plane. It can be calculated from the value of the anatomic cranial proximal radial angle (aCdPRA = 180° - aCrPRA).

The mean value reported for the anatomic caudal proximal radial angle in Labrador Retrievers was 85.1° (range 84.1 to 86.1°).