Mr Woodnutt has practiced as a lower limb specialist in joint replacement for 20 years and has completed over 6,500 joint replacements. He has been involved in research and development in the arthroplasty environment being on the design team for a number of implants and procedures including the introduction of the Optimised Positioning System for hip surgery which allows a bespoke implant positioning for each patient taking into account their own particular anatomy and dynamics of hip motion. He also introduced Patient Specific jigs into Knee Replacement surgery in South Wales. He travels frequently nationally and internationally lecturing on a variety of topics and providing surgeon training in many aspects of arthroplasty surgery.
He also undertakes charity work for remote hospitals where joint replacement surgery is normally unavailable: recent locations include Brazil, South Africa, Tristan da Cuhna, St Helena, Israel and Bangladesh. He has also won an award from the Welsh Assembly for his work in Innovation in Care Delivery and Efficiency within the NHS and ran two theatres regularly for many years at Morriston Hospital in Swansea. His work also includes the development of the recording of data within arthroplasty and was an active member of the Regional Clinical Coordinator Committee and Data Accuracy Committee of the UK National Joint Registry.