About 3 mo. Stabbing pain deep in r. Hip down outside leg to knee very painful from standing to sitting & vice versa & walking - 59 yr. Female?

Varies. There are several possible causes, usually a detailed exam can determine the cause. The two most common causes are a sciatica (which is an irritation of a nerve in the back causing pain down the leg) and a tendinitis of the hip (known as tensor fascia lata syndrome). Thank you for the question.