Abnormality of the lower limb Lower-limb joint contracture Knee flexion contracture Flexion contractures of knees A type of knee joint contracture in which the knee is in a fixed bent (flexed) configuration such that it cannot be straightened actively or passively. Knee flexion deformity Knee flexion contractures HP:0006380 Flexion deformity of the knee Inability to straighten knee SNOMEDCT_US:202289003 UMLS:C0409355 Flexion contractures at both knees HP:0002978 Flexion contracture of knees