Patellofemoral (knee cap)

Results of Medial Retinacular Imbrication in Patients with Unilateral Patellar Dislocation. Shelbourne KD, Urch SE, Gray T. J Knee Surg. 2012;25:391-396. 

Axial Linear Patellar Displacement: A New Measurement of Patellofemoral Congruence. Urch SE, Tritle Ben, Shelbourne KD, Gray T. Am J Sports Med. 2009: 37:970-973

Use of a Modified Elmslie-Trillat Procedure to Improve Abnormal Patellar Congruence Angle. Shelbourne KD, Porter DA, Rozzi W. Am J Sports Med. 1994;22:318-323.