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Fig. 5 | Knee Surgery & Related Research

Fig. 5

From: Internal rotational patellar resection and patella alta induced patellar maltracking in total knee arthroplasty: intraoperative measurement of the patellofemoral pressure

Fig. 5

Radiographic measurement using the skyline view. A The PT is defined as the angle of a line drawn along the long axis of the patella (green dashed line) with respect to a line connecting the anterior aspect of the femoral condyles or femoral component (green solid line), with an external rotational angle being considered as positive. Postoperative PT of the left knee is shown in A. B–D The PRA was defined as the angle of a line drawn through the patellar prosthesis–bone interface (red solid line) with respect to a line along the long axis of the patella (red dashed line), with an external rotational angle being considered as positive. The PRA of the left knee was 2.3° (B). Based on the pre- and postoperative radiographs of the right knee, the PRA was calculated as −8.9° (C, D). PRA patellar resection angle, PT patellar tilt

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Knee Surgery & Related Research

ISSN: 2234-2451