A 56-year-old woman presents to the emergency department with a 3-day history of gradually worsening pain and swelling in her left knee. She denies injury, fever, or other complaints. She has never experienced this type of pain before, and she states that ...

Step forward with right foot while keeping left foot in place. Bend both knees 90 degrees. Front right knee should track over toes (don’t let it fall too far forward or toward the inside of the toes); back left knee hovering just above the floor. Keep core engaged and chest lifted.

Dear Dr. Roach: I have been suffering from strong pain on my left knee for a long time. An MRI was performed, which showed an "extensive degenerative tear throughout the body and a posterior horn of the medial meniscus." It also showed a "flap tear of the ...