FIG. 3.

The T angle is the angle between the triceps line of pull (summated force of the triceps from the individual triceps’ three heads (T₁, T₂, T₃) and the bony alignment of the proximal ulna. A normal carrying angle is about +7° in a man and 10° in a woman (A). In normal individuals, with elbow flexion, the triceps and ulnar nerve are displaced medially but not over the medial epicondyle. In contrast, this patient had a cubitus varus deformity with −12° (B). The resultant altered line of pull is displaced medially. Thus, in a cubitus varus deformity, the medial displacement of the triceps (and ulnar nerve) is more marked and, in some patients, can lead to dislocation over the medial epicondyle with elbow flexion (with permission, Mayo Foundation, 2024).