Original Research

The role of the quadriceps muscle in knee extension

Ellis S. Janks
South African Journal of Physiotherapy | Vol 39, No 1 | a902 | DOI: https://doi.org/10.4102/sajp.v39i1.902 | © 2018 Copyright Status: Not provided. Contact Holding Institution to verify copyright status. Rights Holder: South African Society of Physiotherapy
Submitted: 03 October 2018 | Published: 31 March 1983

About the author(s)

Ellis S. Janks, University of the Witwatersrand, South Africa

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Abstract

In 1949, Smillie proposed that the vastus medialis muscle alone is responsible for the final 10° to 15° of knee extension. A number of more recent studies have proved that the whole quadriceps muscle is responsible for all degrees of knee extension. This evidence is reviewed and the function of the two subdivisions of the vastus medialis is discussed.


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