What could cause of leg pain from hip to knee be?

Many causes : Hip or knee joint problems could cause pain in this area. Bursa, ligament, tendon and/or muscle injury could also be the culprit. A nerve impingement must also be ruled out. If the pain does not resolve in a reasonable amount of time, an evaluation by an orthopedist or your primary care provider may be warranted.

Radiculopathy: Can be referred pain from the spine(like a pinched nerve), can be pain from the hip. Can be local problem in the muscle or bone in the area.