1. Fulkerson JP, Hungerford DS: Biomechanics of the patellofemoral joint, in Disorders of the patellofemoral joint. Baltimore, The Williams & Wilkins Co, 1990, pp 25–41.
2. Aglietti P, Buzzi R, Insall JN: Disorders of the patellofemoral joint, in Insall JN (ed.): Surgery of the Knee. Churchill Livingstone, New York, 1993, pp. 246–251.
3. Hungerford DS, Barry N: Biomechanics of the patellofemoral joint. Clin Orthop 1979; 144: 9–15.
4. Kaufer H: Mechanical function of the patella. J Bone Joint Surg Am 1971; 53A: 1551–1560.
5. Kaufer H: Patellar biomechanics. Clin Orthop 1979; 144: 51–54.