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Deviations from nominal alignment of unicondylar knee replacements impact knee biomechanics, including the load and stress distribution at the articular contact surfaces.
Knees with femoral-tibial rotational mismatch had significantly lower total axial rotation compared to knees with nominal alignment.
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In the Anatomic Landmarks group, TKR were categorized as having "nominal" rotational alignment with respect to anatomic landmarks if the alignment was within ±3° for the femoral components and ±10° for the tibial components.
Ranges of nominal rotational alignment are not well defined, especially for the tibial component and for relative rotational mismatch, and some studies advocate the use of mobile-bearing TKR to accommodate the resulting small rotation errors.
In the current study, TKR were categorized as nominal if component alignment relative to anatomic landmarks was within ±3° for femoral components and within ±10° for tibial components, and if relative femoral-tibial mismatch was within ±5°.
The nominal tolerances for component alignment and rotational mismatch in the transverse plane remain under debate [ 8, 11- 16, 18- 22].
Based on these CT measurements, all TKR were categorized according to nominal tolerances for surgical rotational alignment using criteria based on bone anatomy (Anatomic Landmarks group) or relative rotational alignment between the femoral and tibial components (Rotational Mismatch group).
Outlier TKR in the Anatomic Landmarks group had 12.0° more tibial internal rotation alignment compared to nominal TKR.
If paralogous non-coding regions could be aligned, nucleotide identity was calculated from the alignment; if not, a nominal value was calculated from unaligned sequences.
mayh-yi this- 'this one (did it)' mayh-ga this- 'to here' guda 'fire'woodood' [ɡʊda] wirin 'tree'stickick' [wɪɻɪn] lagiban 'man' [laɡɪban] gordal 'head' [ɡɔɖaɫ] lagiriny 'tail' [laɡɪɻɪɲ] manyngardal 'tongue' [maɲŋaɖaɫ] Pronouns are typologically nominals also, yet their morphosyntactic alignment is nominative accusative rather than ergative absolutive.
Obtaining alignment within the above defined nominal ranges provided for controlled knee axial rotation.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com