New Radiological Assessment of Patellofemoral Arthritis with a Marking on the Tibial Tubercle.

概要

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Sixteen normal knees and 14 knees with patellofemoral osteoarthritis (PF-OA) were evaluated. In each knee, a line was drawn on the skin according to the contour of the tibial tubercle and the patellar ligament, and a wire was placed on the skin so that it matched the width of the patellar tendon. An axial view radiograph was taken at 30° of knee flexion with the Merchant technique. On the radiograph, a line was drawn between the highest point of the medial and lateral condyle (C line). A perpendicular was drawn from the central point of the marking to the C line and the point of intersection was defined as TT point. Another perpendicular was drawn from the lowest point of the sulcus to the C line and the point of intersection was defined as the S point. The length of the C line, the distance between the highest point of the lateral condyle and the TT point (TT-LC distance), and the distance between the TT point and the S point (TT-S distance) were measured.The distance between the medial and lateral condyles was identical between the normal (41.0mm±3.3mm) and the PF-OA group (42.1mm±5.0mm). However, the TT-LC distance was 8.5mm±7.2mm in the normal group and 1.8mm±8.8mm in the PF-OA group (p=0.0276) and the TT-S distance was 16.3mm±7.4mm in the normal group and 23.4mm±6.6mm in the PF-OA group (p=0.0098).This new radiography technique can be used for screening to evaluate patellofemoral disorders.
西日本整形・災害外科学会の論文