AI Article Synopsis
- Manufacturers are using 1-mm polyethylene inserts in total knee replacements for more precise adjustments in joint movement.
- Two experienced surgeons conducted 88 knee surgeries to test if they could accurately determine the thickness of randomly chosen trial inserts.
- Results showed that the surgeons could only correctly identify the insert thickness 62.5% of the time, indicating uncertainty in detecting 1-mm differences, suggesting a need for further research on this method's effectiveness.
Article Abstract
Background: Some manufacturers have introduced polyethylene (PE) inserts in 1-mm increment thickness options to allow for finer adjustments in total knee arthroplasty kinematics.
Methods: Two surgeons with extensive experience performed 88 total knee arthroplasties using implants with 1-mm PE inserts. After trial components were inserted and the optimal PE thickness was selected, the insert was removed and a trial insert size was randomly chosen from opaque envelopes (1-mm smaller, same size, and 1-mm larger). The knee was re-examined and the surgeon determined which size PE had been placed.
Results: Surgeons reliably determined insert thicknesses in 62.5% (55 of 88; P = .050) of trials. Surgeons were not able to accurately detect 1-mm incremental changes of trial PE implants on a consistent basis.
Conclusion: The potential clinical usefulness of this concept should be further evaluated.
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| http://dx.doi.org/10.1016/j.arth.2015.11.018 | DOI Listing |
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