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Knee joint type:

ABall-and-socket
BHinge (allows flexion/extension primarily in one plane)
CPivot
DSaddle
Answer & Solution
Correct answer: B. Hinge (allows flexion/extension primarily in one plane)
**Knee:** modified hinge joint. Allows mainly flexion/extension; some rotation at full flexion. Stabilized by cruciate ligaments (ACL, PCL), collateral ligaments (MCL, LCL), menisci. ACL injury common in sports. Largest synovial joint in body.
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