Mechanical cranial distal humeral angle
Mechanical cranial distal humeral angle
- Acronym: mCrDHA
Definition
The mechanical cranial distal humeral angle is a landmark used to assess angular deformities of the humerus and provide guidance for corrections. It is determined from a mediolateral radiograph or a multipanar reconstruction of the humerus. The circles that best fit over the medial and lateral aspect of the condyle of humerus, should be concentric and should not intersect.
The mechanical cranial distal humeral angle is the angle formed by:
• The distal humeral joint orientation line in the sagittal plane;
• The mechanical humeral axis in the sagittal plane.
The mean value reported for the mechanical cranial distal humeral angle was :
72.9 +/- 7.8° in a population of large-breed non-chondrodystrophic adult dogs (Smith et al. 2017)
71.86 +/- 3.97° in a population of large-breed non-chondrodystrophic adult dogs (Wood et al 2014)
79.47 +/- 1.97° in Shih-Tzu (Jeong et al. 2020)
References
Jeong J et al. (2020) Measurement of Thoracic Limb Joint Reference Angles in Purebred Shih-Tzu Dogs by Computed Tomography. J Vet Clin 37(4):169 doi.org/10.17555/jvc.2020.08.37.4.169
Smith et al. Three-dimensional assessment of curvature, torsion, and canal flare index of the humerus of skeletally mature nonchondrodystrophic dogs. Am J Vet Res 2017;78:1140–1149 https://doi.org/10.2460/ajvr.78.10.1140
Wood et al. (2014). Determination of the Mechanical Axis and Joint Orientation Lines in the Canine Humerus: A Radiographic Cadaveric Study. Veterinary Surgery, 43(4), 414–417. doi:10.1111/j.1532-950x.2014.12134.x
