Figure 4From: First-time patellar dislocation with resultant habitual dislocation two years later, which was not demonstrated on plain X-rays halfway: a case report Plain X-ray taken by the referring physician 1 year after dislocation and 1 year before surgery. Although the patella locates high (Insall Salvati Ratio; 1.2), and the trochlea is shallow (sulcus angle; 168°), the X-ray confirms that the patella is in position.Back to article page