sentences:  It has been suggested that research in the area at the time focused on metal-on-metal bearings “as a class” and insufficiently distinguished the role of prosthesis design and surgical technique.Therefore, the current state of hip-resurfacing is an ongoing debate over material choice, implant design and surgical technique.According to the Australian Orthopaedic Associate National Joint Replacement Registry (AOANJRR) 2018 Annual Report, hip (total) resurfacing is overwhelmingly used for male patients (98% of total resurfacing hip replacement were for male patients), and has declined in popularity since the mid-2000s (the number of total resurfacing procedures in 2017 was 78.7% less than 2005).