CT Analysis of the Patellofemoral Joint in Patients Having Knee Surgery

Comparison of a Novel Weight Bearing Cone Beam Computed Tomography (CT)Scanner Versus a Conventional CT Scanner for Measuring Patellar Instability

The primary hypothesis is that measures of patellofemoral alignment obtained from the investigational cone beam CT scanner will be reduced, but still correlated to those obtained from the conventional CT scan.

Inclusion Criteria:

• Patients who have been diagnosed with acute or chronic patellar malalignment.
• At least 16 years old
• Be willing and able to provide informed consent

Exclusion Criteria:

• Open growth plates
• Previous knee surgery on the affected knee
• Pregnancy (females)
• Fracture of the patellofemoral joint
• Knee ligament injury (other than medial patellofemoral ligament)
• Have greater than Grade II degenerative changes of the patellofemoral joint
• Inability to bear weight on the extremity during the CT scan