Proximal tibial tuberosity angle

The proximal tibial tuberosity angle is a measurement used to assess the anatomy of the tibia and its modification in predisposed dogs or dogs at risk for cranial cruciate ligament rupture. It is determined from a mediolateral radiograph of the tibia. The X-ray beam is centered at the stifle joint. Positioning is considered satisfactory if the medial condyle and lateral condyle are superimposed.

The following points are identified:

• A = most cranial point of the proximal articular surface;

• B = midpoint between the caudal parts of the articular surfaces of the lateral condyle and medial condyle of the tibia.

• C = most proximal point of the cranial border of the tibia.

The proximal tibial tuberosity angle is the angle formed by the lines AC and CB

Inauen et al. (2009) found that the proximal tibial tuberosity angle was 27.6+/-4.2° in healthy dogs.