Polymotion; The Custom Highly Crosslinked Polyethylene Hip Resurfacing surgical technique
Subscribe to get full access to this operation and the extensive Hip Surgery Atlas.
Learn the Polymotion; The Custom Highly Crosslinked Polyethylene Hip Resurfacing surgical technique with step by step instructions on OrthOracle. Our e-learning platform contains high resolution images and a certified CME of the Polymotion; The Custom Highly Crosslinked Polyethylene Hip Resurfacing surgical procedure.
Metal on Metal Hip Resurfacing in male patients with osteoarthritis has been durable out to nearly two decades across four continents utilising the Birmingham Hip Resurfacing.
The results in females have been less predictable with survivals varying from 2% failure at 18 years to nearly 30% failure in one centre at 10 years. This lack of consistency has led to the withdrawal of the smaller sized implants by the manufacturer and advice from Regulatory bodies to avoid smaller sizes of MoM Resurfacing- particularly affecting women.
The MoM couple has not been forgiving to edge wear. High blood metal ions and soft tissue reactions have resulted. A greater understanding of component positioning and edge wear has been realised with the dramatic failure of some implants with reduced cup articulation angles. In addition the flexible and dynamic nature of the acetabulum during different activities is now significantly better appreciated.
Metal on Plastic Resurfacing was widespead four decades ago but the volumetric polyethylene wear associated with the necessary femoral head diameter resulted in osteolysis and early failure through neck fracture and cup loosening. The advent of HXLPE nearly 15 years ago marked a liberation in femoral diameter constraint. Clinical and simulator studies have shown negligible wear out to tens of millions of cycles even with a diameter of 40mm or more; this has legitimised the reintroduction of polythylene as part of the bearing couple in a new resurfacing.
By necessity resurfacing shells have to be thin and respecting the 6mm inside/outside diameter difference of BHR, using proprietary plasma spray techniques, the Polymotion Cup meets these exacting standards.
Author: Mr Ronan Treacy FRCS
Institution: The Royal Orthopaedic hospital ,Birmingham ,UK.
- Each operation and the questions associated become named course in the CPD section
- The operative technique itself is read as a lesson as is any company implant information if this is being assessed.
- You’ll need to tick the box to confirm this has been done and can do this immediately if you have already read the op tech.
- The vast majority of operations have a 10-15 MCQ quiz covering all aspects of the decision making and the technique
- There are four possible answers of which one is correct (or on occasion more correct) than the others.
- There are additional quiz modules on the surgical steps, the implants and problem cases being added continually
- The course is completed once all the lessons are read and quizzes submitted and passed.
- On successful completion of each quiz you will receive a validated certificate in your CPD folder.
- Your dashboard also will contain a record of the time you have spent logged onto and using the site.
- The timer suspends after 5 minutes though if there is no activity.
- When you restart you will resume at the same point in the module.
- Once you have completed each quiz you will need to feedback on the module first then click “submit” and your paper will be marked.
The pass mark is 75%.
- If you fall below this level you will be directed back to re-read the slides where you’ve tripped up.
- Once these have been read you can re-do just the questions you failed on.
- Once you have passed the quiz you can return at a future stage & resit .
Welcome to the Professional Development question section. The objective of taking these tests is to demonstrate that you have understood all aspects of the assessment and management of patients requiring surgical intevention. On successful completion you will receive a certificate accredited by both the Royal College of Surgeons of both England and Edinburgh as well as the British Orthopaedic Association.
Our content is designed for both Surgeons in independent practice and Surgeons in training.