1 / 18

Orthopedic Adaptor Oral Presentation #3

Designing a universal adaptor connecting femoral nail to knee prosthesis for efficient surgery in periprosthetic femoral fractures. Using titanium and cobalt chrome biomaterials.

tbarrow
Download Presentation

Orthopedic Adaptor Oral Presentation #3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Orthopedic AdaptorOral Presentation #3 • Kate Huddleston • Anna Duloy • Alexander Byall • Ashley Goodnight

  2. Schematic of Femur and Tibia

  3. Schematic of Knee with Prosthesis (pre-periprosthetic Fracture)

  4. Schematic of Femur and Tibia post-Periprosthetic Fracture

  5. Project Definition • To design an adaptor that will connect the nail inserted into the shaft of the femur to the knee prosthesis, in the event that a periprosthetic femoral fracture has occurred

  6. List of Constraints • Hold the nail 5 degrees relative to the prosthetic joint • Universal • Maintain rigid structure • Irremovable knee prosthesis • Compatible with both right and left knee

  7. Project Background • Periprosthetic femoral fractures • These fractures occur: • when femur weakens during surgery • in patients with osteoporosis and rheumatoid arthritis • No current method to attach nail and prosthesis

  8. Importance • 300,000 total knee replacements per year. Of these there are 4,650 cases of periprosthetic femoral fractures (Incidence rate 0.6%-2.5%) • Target population: average age of patient is about 68, but range lies anywhere from 42-92

  9. Cost • Cost of periprosthetic femoral fracture repair: • $30,000 (physician, hospital stay, radiology) • Cost of adaptor: • Unknown at this point • Material decided, but specifications undecided

  10. Attachment Mechanism • Brainstorm on pros and cons of each • Practicality of design • Ease of use • Twist and lock was a possible mechanism:

  11. Initial Adaptor Schematic

  12. Current Adaptor Schematic

  13. Adaptor Advantages • Significantly quicker procedure • 2 pins versus 4 • Less surgical dissection • Less blood loss • Better way to maintain alignment between femur and prosthetic knee

  14. Biomaterials • Factors to consider: • Compatibility with nail (same material) and prosthetic material • Oxidation reactions, Galvanic corrosion • Strength • Expense • Availability • Chosen Material: • titanium (Grade 5 or 6-4) - nail and adaptor • cobalt chrome - knee

  15. Current Status • Weekly meetings in Med Center Orthopedics Lab with Advisors • Attachment Mechanism • Details (dimensions) • Schematic • Specifications • Contacted Johnson & Johnson • Ordered retrograde femoral nail

  16. Future Work • Work out details of chosen design • Draw design on CAD • Determine Stresses • Work on installation procedures • Continue meeting with advisors

  17. Acknowledgements • We would like to thank the following people for their help: • Dr. Limbird • Jeff Gordon • Sue Larson • Mike Bailey • Dr. King

  18. References • http://www.emedicine.com/orthoped/topic254.htm • http://www.orthoteers.co.uk/Nrujp~ij33lm/Orthtkrperiprosthfrac.htm • http://www.eng.hull.ac.uk/research/medical/fracture_plate_intro.htm

More Related