Figure 3From: First-time patellar dislocation with resultant habitual dislocation two years later, which was not demonstrated on plain X-rays halfway: a case report Measurement of the lateral deviation angle. The lateral deviation angle, which is defined as the external rotation angle of the tibial tuberosity (Fig. 3-B) relative to the transepicondylar line of the femur (Fig. 3-A), is 36°.Back to article page