ABSTRACT
Positioning for antero-posterior knee projection – standing. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315382210/8ca82e7c-bd07-4171-b4f5-ebaded57b5b3/content/fig2_46a.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/> Positioning for antero-posterior knee projection – supine. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315382210/8ca82e7c-bd07-4171-b4f5-ebaded57b5b3/content/fig2_46b.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>
This projection can be obtained in the weight-bearing (erect) or supine (conventional) position.
Unless the patient is unable to safely stand, the erect (weight-bearing) position is increasingly being obtained as the first-line projection.
Erect: the patient stands with their back against the vertical Bucky or DDR receptor (grid removed), using it for support if necessary. The patient’s weight is distributed equally.
Supine: the patient is supine or seated on the table with both legs extended. The image receptor is positioned behind the knee joint.
The knee is rotated so that the patella lies equally between the femoral condyles.
The centre of the image receptor is level with the palpable upper borders of the tibial condyles.
