1) Saarakkala S, Waris P, Waris V, et al. Diagnostic performance of knee ultrasonography for detecting degenerative changes of articular cartilage. Osteoarthritis Cartilage 2012;20(5):376-81.
2) Bhimani R, Ashkani-Esfahani S, Mirochnik K, et al. Utility of diagnostic ultrasound in the assessment of patellar instability. Orthop J Sports Med 2022;10(5):2325967. doi:10.1177/23259671221098748.
3) Chen CL, Lo CL, Huang KC, et al. Intrarater reliability of measuring the patella position by ultrasonography in weight-bearing condition. J Phys Ther Sci 2017;29(10):1865-8.
4) Charles MD, Haloman S, Chen L, et al. Magnetic resonance imaging-based topographical differences between control and recurrent patellofemoral instability patients. Am J Sports Med 2013;41(2):374-84.
5) Guilbert S, Chassaing V, Radier C, et al. Axial MRI index of patellar engagement:a new method to assess patellar instability. Orthop Traumatol Surg Res 2013;99(8 Suppl):399-405.
6) Eijkenboom JFA, Waarsing JH, Oei EHG, et al. Is patellofemoral pain a precursor to osteoarthritis?:patellofemoral osteoarthritis and patellofemoral pain patients share aberrant patellar shape compared with healthy controls. Bone Joint Res 2018;7(9):541-7.
7) Laprade Judi, Culham Elsie. Radiographic measures in subjects who are asymptomatic and subjects with patellofemoral pain syndrome. Clin Orthop Relat Res 2003;(414):172-82.
8) Papadopoulos K, Stasinopoulos D, Ganchev D. A systematic review of reviews in patellofemoral pain syndrome:exploring the risk factors, diagnostic tests outcome measurements and exercise treatment. The Open Sports Medicine Journal 2015;9:7-17.
9) Herrimgton L, Pearson S. The applicability of ultrasound imaging in the assessment of dynamic patella tracking:a preliminary investigation. Knee 2008;15(2):125-7.