Fig. 7
From: Outcomes of surgical treatment of patellar instability in children with Down syndrome
Computed Tomography CT scans. (a) Preoperative axial CT scan of the right knee showing lateral patellar subluxation and the patellar tilt angle (PTA; the angle formed between a line defining the maximal width of the patella and the femoral posterior condylar line; 44.60). (b) Post-operative final axial CT scan of the same knee showing an improved PTA (1.80) and a centralized patella