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Table 2

Patient characteristics.

Case no. Age Gender Aetiology of TKA Patella BMI ASA Previous knee surgeries PS CDI PT ROM HKA Femoral rotation Tibial rotation
1 70 F Post-traumatic Dislocated 31 2 4 3.72 0.7 30 0–100 181 Not available Not available
2 71 F Idiopathic OA Dislocated 40 3 2 −0.5 1.26 37 0–110 178 0 6
3 83 F Post-traumatic Dislocated 30 3 3 4.46 0.71 40 0–85 178 1 11
4 70 M Revision for infection Dislocated 37 3 4 5 0.45 47 0–120 177 0 5
5 73 F HTO Dislocated 35 2 2 4.7 0.45 65 0–130 176 −3 10

PS = Lateral patella shift measurements (cm). Negative values indicate medial displacement and positive values indicate lateral displacement; PT = Lateral patella tilt; CDI = Caton-Deschamp Index; ROM = Range-of-motion; ASA = American Society of Anaesthesiologist grade; HKA = Hip-Knee-Angle as measure on long leg plain radiograph; BMI = Body mass index; Femoral rotation = As measured on CT scan relative to the trans-epicondylar axis. Negative values indicate external rotation, positive values indicate internal rotation; Tibial rotation = As measured on CT scan relative to the centre of the tibial-tuberosity. Positive values indicate internal rotation.

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