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Knee flexion deformity - Definition


A flexion deformity in the knee is the transient or permanent locking of the knee in a position more or less bent. This may be the result of a shock that the knee has suffered or be caused by a popliteal cyst, located in the hollow behind the knee, and preventing the full extension. Other mechanical causes, such as a collection of fluid in the joint, a condition most often affecting the hip, or maintaining a bent position with a splint may be responsible in an isolated case. The diagnosis is made through a physical examination where the knee is found slightly bent despite an attempt at full extension, which is logically possible with one leg, forming a flat angle. A flexion deformity in the knee causes discomfort when walking, and treating the cause can enable the knee to recover optimal function.