Genu recurvatum

Genu recurvatum
Ella Harper had genu recurvatum.[1]
Classification and external resources
Specialty medical genetics, rheumatology
ICD-10 M21.8, Q68.2
ICD-9-CM 736.5, 754.40

Genu recurvatum is a deformity in the knee joint, so that the knee bends backwards. In this deformity, excessive extension occurs in the tibiofemoral joint. Genu recurvatum is also called knee hyperextension and back knee. This deformity is more common in women and people with familial ligamentous laxity.[2] Hyperextension of the knee may be mild, moderate or severe.

The normal range of motion (ROM) of the knee joint is from 0 to 135 degrees in an adult. Full knee extension should be no more than 10 degrees. In genu recurvatum (back knee), normal extension is increased. The development of genu recurvatum may lead to knee pain and knee osteoarthritis.


The following factors may be involved in causing this deformity:

Knee stabilization

The most important factors of knee stability include:


Treatment generally includes the following:

See also


  1. Pednaud, J. Tithonu. "The Human Marvels". Retrieved 2010-04-24.
  2. Benson, Michael; Fixsen, John; Macnicol, Malcolm (2009-08-01). Children's Orthopaedics and Fractures. Springer. pp. 495–. ISBN 978-1-84882-610-6. Retrieved 29 July 2011.
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