The bursae are fluid-filled sacs that cushion the hip joint and decrease friction. When these sacs grow to be inflamed, a ailment known as bursitis develops, causing pain on the skin of your hip, especially when walking or lying to the affected facet. Osteochondritis Dissecans: Separation of a bone fragment https://www.theorthopaedicandpainpractice.com/i-have-pain-over-the-front-of-my-hip-do-i-have-femoral-acetabular-impingement/