A flexion contracture or flexion deformity is when someone is not able to fully straighten their leg either actively or passively.
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CLINICAL PUBLICATIONS
The natural history of a newly developed flexion contracture following primary total knee arthroplasty. Anania A, Abdel MP, Lee Y, Lyman S and Della Valle AG. Int Orthop. 2013 Oct; 37(10): 1917–1923.