Could i have torn my meniscus ? i am unable to straighten the knee and standing in one place is pure torture. please help

Very likely: Locked knees happen because something is blocking them like a loose body or meniscus. You should get it checked as delay can damage the surface cartilage

Get evaluated: Knee pain and loss of motion can have multiple causes including but not limited to trauma, infection, inflammation, and neoplasm. A thorough history and physical followed by diagnostic imaging can help get the answers and treatment you might need. A meniscus tear can result in locking, catching, and giving way.