Jordy van Sambeeck

Patellar height measurements: Insall-Salvati ratio is most reliable method 2 33 Figure 1. Patellar height measurement methods a: Insall-Salvati ratio: Ratio of the length of the patellar tendon (measured from the distal pole of the patella to the tibial tuberosity) (A) to the maximum length of the patella (measured from the distal pole to the proximal pole of the patella) (B). b: Blackburne-Peel ratio: Ratio of the height of the distal pole of the patellar articular surface above a tibial plateau line (A) to the articular surface length of the patella (B). c: Caton-Deschamps ratio: Ratio of the distance between the anterosuperior point of the tibial plateau and the distal pole of the patellar articular surface (A) to the articular surface length of the patella (B). d: Modified Insall-Salvati ratio: Ratio of the distance between the distal pole of the patellar articular surface and the tibial tuberosity (A) to the articular surface length of the patella (B). e: Patellotrochlear index: Overlap percentage of the trochlear cartilage (measured from the superior most aspect of trochlear cartilage with respect to the inferior most aspect of the articular patellar cartilage using a right angle and parallel lines) (A) and the articular cartilage of the patella (B).