AI Article Synopsis
- An accelerated model was used to test the stability of three noncemented femoral stem designs in the presence of bone loss.
- The dual-tapered, diaphyseal press-fit stem design maintained stability even with substantial bone loss, showing minimal micromotion.
- In contrast, fully and proximally coated stems became unstable with less bone loss, highlighting the advantages of dual-tapered designs for revision surgeries.
Article Abstract
An accelerated sequential proximal femoral bone loss model was used to measure the initial stability of three noncemented femoral stem designs: fully porous-coated, proximally porous-coated, and dual-tapered, diaphyseal press-fit (N=18). Only dual-tapered, diaphyseal press-fit stems remained stable with as much as 105 mm of bone loss, with average cyclic micromotion remaining below 25 μm in ML and below 10 μm in AP planes. In contrast, with proximally coated and fully coated stem designs with circular or oval cross-sections, 60mm of bone loss, resulting in lower than 10 cm of diaphyseal bone contact length, led to gross instability, increasing average cyclic micromotions to greater than 100 μm prior to failure. Therefore, the results provide support for using a dual-tapered stem in revision cases with proximal bone loss.
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| http://dx.doi.org/10.1016/j.arth.2013.01.017 | DOI Listing |
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