Mechanical caudal proximal humeral angle
Mechanical caudal proximal humeral angle
- Acronym: mCaPHA
Definition
The mechanical caudal proximal 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 caudal proximal humeral angle is the angle formed by:
• The proximal humeral joint orientation line in the sagittal plane;
• The mechanical humeral axis in the sagittal plane
The mean values reported for the mechanical caudal proximal humeral angle are :
50.2 +/- 4.5° in a population of large-breed non-chodrondystrophy adult dogs (Smith et al. 2017)
43.28 +/- 5.44° in a population of large-breed non-chodrondystrophy adult dogs (Wood et al 2014)
46.75 +/- 2.20° in Shih-Tzu (Jeong et al. 2020)
References
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
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
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
