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Fig. 2 | Journal of Orthopaedic Surgery and Research

Fig. 2

From: Proximal tibial morphology and risk of posterior tibial cortex impingement in patients with AA-sized Oxford unicompartmental knee arthroplasty tibial implants

Fig. 2

Radiographic measurement of tibial component position. a The mediolateral tibial component position was measured and is represented as ratio a/A, where, “a” is the distance from the medial edge of the proximal tibia to the lateral wall of the tibial component and “A” is the distance from the medial edge of the proximal tibia to the tibial axis. b The axial alignment of the tibial component was assessed in terms of R; the angle between a line tangential to the lateral wall of the tibial component and Akagi’s line. Values indicative of external rotation of the tibial component relative to Akagi’s line were considered to be positive. Akagi line is referred to a line connecting the middle of the posterior cruciate ligament and the medial border of the patellar tendon attachment. c The posterior cortex of the proximal tibia had two obvious angles with the 90° rotated “Z”-shape. From proximal to distal, the angles were known as the first and second angles, respectively, and were recorded as M1 and M2, respectively. All the angles were measured and expressed as acute angles for statistical convenience. d The minimum distance between the tibial component keel and the outer margin of the posterior tibial cortex was recorded as mDKC

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