Quantification Of Trochlea Dysplasia Via Computed Tomography: Assessment Of Morphology Difference Between Control And Chronic Patellofemoral Instability Patients.

Objectives:Trochlear dysplasia is an important risk factor for the development of recurrent patella instability. Owing to its complex 3-Dimensional morphology, the need for a true lateral radiograph, and poor inter-observer reliability, the Dejour classification system of dysplasia may not be the most optimal measure for quantification. The purpose of this study is to report a novel technique to define and quantify the trochlea volume and length using an axial computed tomography. This technique was applied to a series of patients surgically treated for recurrent patellofemoral instability and the measurements compared to a control group.Methods:From 2007 to 2013, 99 control patients (136 knees) were identified from trauma CT scans obtained during admission at our Level I trauma hospital. Patients older than 35y/o or with fractures in the distal femur were excluded. Axial cuts at 1.25 mm were used to measure trochlea volume; defined to be from the physeal scar to the final axial image in which the sulcus ...