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Yoo, Joanne Y., BS; Cai, Jenny, BS; Chen, Antonia F., MD, MBA; Austin, Matthew S., MD; Sharkey, Peter F., MD
The Journal of arthroplasty, 05/2016, Volume: 31, Issue: 5Journal 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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