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This condition happens due to twisting of the knee with some flexion. Younger people who are mostly involved in sports are prone to this.
Older people suffer this due to the onset of age-related deterioration of the meniscus or a when the softer meniscus is torn off by the femoral bone surface which has become rough due to arthritis.
Knee becomes swollen and painful immediately after the swelling and pain are noted immediately after the damage.
Motion becomes limited and movement becomes painful.