Intra-articular hip injection is a valuable and cost-effective diagnostic tool but replacing advanced diagnostic methods is not currently the way to go: commentary on an article by Daniel J. Cunningham, MD, MHS, et al.: “Advanced imaging adds little value in the diagnosis of femoroacetabular impingement syndrome” - Philippon, M J; Bolia, I K (J Bone Joint Surg Am, 2017)