What Causes Radiating Pain From Hip To Thigh With History Of Hip Injury?

Hello. I have pain in my right hip that radiates down the side/front of my thigh to the outside of my knee and the shin. Sometimes my entire pelvis hurts, including the pelvic floor. I have an appt. next Tuesday with a hip specialist. I had an injury to the hip in 1990 that I never had diagnosed; eventually the injury seemed to heal with only periodic painful reminders. I d like to have some idea of what this might be - it s affecting my quality of life because walking, sitting and standing (housecleaning, exercise, etc.) are painful. I m 65 and had a complete hysterectomy in 2001.