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Figure 2 | BMC Musculoskeletal Disorders

Figure 2

From: Rotational alignment of the tibial component in total knee arthroplasty is better at the medial third of tibial tuberosity than at the medial border

Figure 2

Determination of the "true" rotational variance between femur and tibia: Transepicondylar axis (a) is superimposed to the tibia and a perpendicular line is drawn through the rotational centre of the tibial tray (fixation peg for rotating platform, b). These lines are superimposed to a slice where the tibial tuberosity is visible (c). The tibial tuberosity is divided into three parts (d). The angle between a line from the medial border of the tibial tuberosity to the rotational center and the line perpendicular to the transepicondylar axis is measured (e). The angle between a line from the lateral border of the medial third of the tibial tuberosity to the rotational center and the line perpendicular to the transepicondylar axis is measured (f).

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