Figure 8From: Trochleoplasty in major trochlear dysplasia: current concepts Pre and Post-operative bump height measurement technique. A and B: Drawings showing the Dejour and Walch method for calculating the bump height. Point "D" is the junction between the posterior cortex and articular cartilage. Bump height is measured between points "B" and "C". C: Pre operative lateral radiograph: the boss height is positive. D: Post operative lateral radiograph: the boss height is now negative.Back to article page