Knee pain when moving side to side?

Many causes get seen: The knee can hurt moving side to side for a variety of reasons. Your meniscus in your knee can be injured causing pain, your ligaments can be strained, you can have a stress fracture of your femur or tibia, your muscle insertions can be inflamed, you can have an inflammatory arthritis. Less likey but other causes: gout, lyme disease, recent illness, tumor. Get seen by orthopedic surgeon.