Radiographic landmarks for locating the femoral origin of the superficial medial collateral ligament (sMCL). A lateral view is shown of a right knee under fluoroscopy with a K-wire in the center of the femoral insertion of the sMCL. Line 1 is drawn parallel to the posterior aspect of the posterior femoral cortex (y-axis), and line 2 (x-axis) is drawn perpendicular to line 1, where line 1 intersects the Blumensaat line. The K-wire should be placed close to the intersection of the two lines in the proximal-anterior and proximal-posterior quadrant.25