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Patellofemoral/extensor mechanism disorders 

Patellofemoral/extensor mechanism disorders
Patellofemoral/extensor mechanism disorders

Nicholas Peirce

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date: 19 June 2021

Anterior knee pain represents up to 50% of all knee injuries, and is the most common presentation to sports injuries clinics, accounting for 25–33% of all visits. Anterior knee pain customarily follows chronic overload of the extensor mechanism, including the patellofemoral joint, the patellar tendon, and its bony attachments, but can be associated with traumatic episodes. As the name implies, it is very much an umbrella term encompassing a huge variety of disorders of the extensor mechanism, patellofemoral joint, and associated structures. This chapter attempts to distinguish between the different conditions that predispose to anterior knee pain including patellofemoral pain, patella dislocations, synovial plica, extensor mechanism pains (including patella tendonopathy), and some of the uncommon but important differential diagnoses to consider. After an injury has been defined as traumatic or non-traumatic, the anterior knee pain can be classified.

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