With more young adults requiring total hip
arthroplasties the need for bone saving implants becomes
more important. The Zimmer Fitmore is a new bone saving
implant that utilizes an implantation technique that
reduces the damage to the muscle tissue allowing for
patients to have a short recovery time as well as a new
design that allows it to rest on the medial cortex. There
has been anecdotal evidence that this device leads to early
revision within six months of implantation due to failures
occurring in the medial cortex. The main goal of this
study was to computationally model the Zimmer Fitmore and
compare it to the ML Taper to see if the failures are due
to the design of the implant. The models were created
using CT scans of the implants and the same implantation
process was simulated for each. Two sizes for the cortical
bone thickness, 4mm and 10mm, were used and contrasted with
each other. The 10mm cortical thickness model showed that
v
the strains experienced by the Zimmer Fitmore femur were
higher than that of the ML Taper. The 4mm model did not
fully complete the simulation, but the results that were
obtained showed an increased strain in Gruen zone 7. These
results show that the design, not implantation method,
could be to blame for the need for early revision when
using the Zimmer Fitmore.
| Identifer | oai:union.ndltd.org:CALPOLY/oai:digitalcommons.calpoly.edu:theses-2145 |
| Date | 01 May 2013 |
| Creators | Franklin, Tyler Kazuo |
| Publisher | DigitalCommons@CalPoly |
| Source Sets | California Polytechnic State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Master's Theses |
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