Hejgaard, Niels, and Steen Watt-Boolsen. 1982. “The Effect of Anterior Displacement of the Tibial Tuberosity in Idiopathic Chondromalacia Patellae: A Prospective Randomized Study”. Acta Orthopaedica 53 (1):135-39. https://doi.org/10.3109/17453678208992191.