Anatomic tibial axis
Anatomic tibial axis
- Synonym: Diaphyseal tibial axis; distal tibial axis; anatomical distal tibial axis
- Acronym: aTA
Definition
The anatomical tibial axis is a landmark used to assess angular deformities of the tibia and provide guidance for corrections.
It is determined from a medio-lateral x-ray of the tibia. Positioning is considered satisfactory if the medial condyle and lateral condyle are superimposed.
The anatomical tibial axis is defined as a line joining the center of the tibial diaphysis (middle of the segment connecting the cranial and caudal cortices) at 50% and 75% of the total length of the tibial diaphysis.
References
Guénégo L, Payot M, Charru P, Verwaerde P. Comparison of tibial anatomic-mechanical axis angle between predisposed dogs and dogs at low risk for cranial cruciate ligament rupture. Vet J. 2017 Jul;225:35-41. doi: 10.1016/j.tvjl.2017.04.011. Epub 2017 May 3. PMID: 28720297.
Osmond CS, Marcellin-Little DJ, Harrysson OL, Kidd LB. Morphometric assessment of the proximal portion of the tibia in dogs with and without cranial cruciate ligament rupture. Vet Radiol Ultrasound. 2006 Mar-Apr;47(2):136-41. doi: 10.1111/j.1740-8261.2006.00119.x. PMID: 16553144.
Vedrine B, Guillemot A, Fontaine D, Ragetly GR, Etchepareborde S. Comparative anatomy of the proximal tibia in healthy Labrador Retrievers and Yorkshire Terriers. Vet Comp Orthop Traumatol. 2013;26(4):266-70. doi: 10.3415/VCOT-12-02-0018. Epub 2013 Apr 24.
