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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Commonest dangerous complication of posterior dislocation of knee is -
assistant
The correct answer is  Dislocation of the knee

This rare injury results from severe violence to the knee so that all of its supporting ligaments are torn.
It is a major damage to the joint, and is often associated with injury to the popliteal artery.
Treatment is by reduction followed by immobilization in a cylinder cast.