Hip pain can sneak up on runners after miles of pounding the pavement, especially when they’re pushing mileage or intensity. Sometimes, it starts as a dull ache and becomes a sharp pain with hip flexion, uphill running, or sprinting. If this sounds familiar, hip impingement might be to blame. Also known as femoroacetabular impingement (FAI), hip impingement happens when there’s abnormal contact between the bones of the hip joint during movement. If left unchecked, hip impinge