This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': 'The medial meniscus of the knee joint is injured more often than the lateral meniscus because the medial meniscus is relative - \nSelect and explain. \nA. More mobile, B. Less mobile, C. Thinner, D. Attached lightly to femur', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Medial meniscus is more frequently injured than lateral meniscus because : -\n\n\nThe medial meniscus is securely attached around the entire periphery of the joint capsule, which makes it less mobile.\nWhereas the lateral meniscus is more mobile and has no weak point between a movable and relatively fixed point.\nPopliteus muscle sends few fibers into the posterior margin of the lateral meniscus. Thus muscle contraction withdraws & protects the lateral meniscus by drawing it posterolaterally during flexion of the knee and medial rotation of the tibia.', 'role': 'assistant'}]