Abstract
The patellofemoral joint has a low degree of congruency by nature; therefore it is more susceptible to dislocation. There are active and passive restraints that prevent the patella from being subluxated or dislocated. The passive stability depends on static anatomical restraints, and the congruence between the trochlea and the patella, which is low. The active stability is provided by the dynamic restraints, the muscles and the balance between the ligaments; both bony and soft tissues structures provide an active and passive stability which allows the patella to function during knee movements. Patellar dislocation has a low rate of recurrence. Some predisposing factors, mostly congenital, lead to chronic patellar instability; these factors have a high genetic incidence.
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Dejour, D., Byn, P., Saggin, P.R. (2010). Deepening Trochleoplasty for Patellar Instability. In: Zaffagnini, S., Dejour, D., Arendt, E. (eds) Patellofemoral Pain, Instability, and Arthritis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05424-2_28
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DOI: https://doi.org/10.1007/978-3-642-05424-2_28
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