Review Question - QID 3611

Correct positioning of a graft for MPFL reconstruction requires accurate placement of the femoral attachment site which is anterior to a line extended from the posterior cortex and just proximal to the posterior extension of Blumensaat's line. Intra-operative fluoroscopy can be used to accurately identify this position.

Schottle et al have described the radiographic landmark to be 1 mm anterior to the posterior cortex extension line, 2.5 mm distal to the posterior origin of the medial femoral condyle, and proximal to the level of the posterior point of the Blumensaat line.

Redfern et al evaluate this radiographic point and found it to be within 4mm of the true attachment on anatomic dissection.

This is demonstrated in Illustration A: the star shows the correct location anterior to the posterior cortical extension line (solid black line), proximal to Blumensaat's (red) line, and between the posterior origin of the medial femoral condyle and the posterior aspect of Blumensaat's line (perpendicular dashed lines).