Trunnion failure in modern THR: a consequence of hubris? Seminar
- Time:
- 13:00
- Date:
- 16 February 2018
- Venue:
- Building 6, Room 1083(L/R/C)
Event details
This talk is about the study of the effect of assembly force on the strength of head-trunnion interface and the initial displacement of the head on the trunnion with different assembly forces. Load levels were measured with a laser sensor. The disassembly force was determined by a standard pull-off test. The maximum head displacement on the trunnion was significantly different, with increasing assembly load leading to a higher pull-off force. A first peak of approximately 2.5kN was observed on the load recordings during assembly before the required assembly load was eventually reached corresponding to sudden increase in head displacement to approximately 150µm. An assembly force of 2kN may be too low to overcome the frictional forces needed to engage the head and achieve maximum displacement on the trunnion and thus an assembly load of greater than 2.5kN is recommended.
Speaker information
Prof Richie Gill , Department of Mechanical Engineering, University of Bath, UK. Richie Gill is the Professor of Healthcare Engineering at the University of Bath. His research area is Bioengineering with a particular interest in Orthopaedics. Professor Gill completed a first degree in Aerospace Engineering and initially worked in the aerospace industry. He developed an interest in bioengineering and undertook a PhD in Orthopaedic Mechanics. He has spent over 20 years working in a mixed clinical/research environment and was the Group Head of the Oxford Orthopaedic Engineering Centre from 2001 until 2012, when he moved to the University of Bath. He is currently on the Executive Committees of the British Orthopaedic Research Society and the European Orthopaedic Research Society, and a member of the Editorial Board of the Bone and Joint Journal.