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The Journal of Bone and Joint Surgery, Vol 60, Issue 1 55-60, Copyright © 1978 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

The abnormal lateral patellofemoral angle: a diagnostic roentgenographic sign of recurrent patellar subluxation

CA Laurin, HP Levesque, R Dussault, H Labelle and JP Peides

On roentgenograms made with the patient supine, the knees flexed 20 to 30 degrees, the x-ray tube between the ankles, and the cassette held proximal to the knees and perpendicular to the x-ray beam, it was found that a line between the femoral condyles and a line between the margins of the lateral facet of the patella formed the lateral patellofemoral angle, an angle that was of diagnostic value in patients with subluxation of the patella. In 100 clinically normal patients, these lines were parallel in three and formed an angle open laterally in ninety-seven. In thirty patients with subluxation of the patella, the lines were parallel in twenty-four and formed an angle open medially in six. In 100 patients with chondromalacia of the patella, however, the roentgenographic study was of no diagnostic value since the lines were parallel in ten and formed an angle open laterally in ninety.
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