Mechanical lateral distal humeral angle
Mechanical lateral distal humeral angle
- Acronym: mLDHA
Definition
The mechanical lateral distal humeral angle is a landmark used to assess angular deformities of the humerus and provide guidance for corrections. It is determined from a cranio-caudal radiograph or multiplanar reconstructed CT images of the humerus.
The mechanical lateral distal humeral angle is the angle formed by the mechanical humeral axis in the frontal plane and the distal humeral joint orientation line in the frontal plane.
The mean values reported for the mechanical lateral distal humeral angle are :
87.3 +/- 2.9° in a population of large-breed nonchondrondystrophy adult dogs (Smith et al. 2017)
86.92 +/- 1.24° in a population of large-breed nonchondrondystrophy adult dogs (Wood et al. 2014)
85.04 +/- 2.57° in Shih-Tzu (Jeong et al. 2020)
90.3 +/- 2.6° and 89.0 +/- 3.5° in recumbent and standing Labrador Retrievers respectively (Goordrich et al. 2013)
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
Goodrich et al. Thoracic Limb Alignment in Healthy Labrador Retrievers: Evaluation of Standing Versus Recumbent Frontal Plane Radiography. Veterinary Surgery 43 (2014) 791–803. DOI:10.1111/j.1532-950X.2014.12140.x
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
