Open Wedge High Tibial Osteotomy with Distal Tubercle Osteotomy Lessens Change in Patellar Position

Figure 4

Methods of assessing lateral patellar tilt (LPT) and lateral patellar shift (LPS): (a) patient positioned for computed tomography imaging with knee in 30 degrees of flexion; (b) LPT, defined as the angle between a line intersecting the widest bony structure of the patella and a line tangential to the anterior femoral condylar surfaces; (c) LPS, defined as the ratio of distances , where is the distance between the summits of the medial and lateral femoral condyles and is the distance between the summit of the lateral femoral condyle and the point where a line from the lateral edge of the patella perpendicular to the line that passed through the summits of the femoral condyles crosses that line. L, lateral; M, medial.

(a)

(b)

(c)