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Fig. 3 | BMC Musculoskeletal Disorders

Fig. 3

From: Characteristics of the patellofemoral joint of patients with DDH and the effects of Bernese periacetabular osteotomy on the patellofemoral joint

Fig. 3

Two transverse images were superimposed to measure the tibial tuberosity-trochlear groove (TT-TG) distance. The first transverse image that depicted a complete cartilaginous trochlea was adopted to determine the deepest point within the trochlear groove. The second transverse image shows the most anterior portion of the tibial tubercle. Line “a” is tangent to the posterior epicondyle. Line “b” goes through the deepest point of the trochlear groove, perpendicular to line “a”. Line “c” is parallel to line “b” and goes through the most anterior portion of the tibial tubercle. The TT-TG measurement is the distance between lines “b” and “c”

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