Study finds, Wide variation in tibial slopes and trochlear a
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The purpose of this retrospective observational cohort study is to evaluate variability in knee anatomy and alignment beyond the coronal plane and rationalise how this relates to existing arthroplasty alignment philosophies.

4116 knee CTs from 360 Knee Systems database of arthritic pre-operative TKA patients were evaluated. Standardised bony landmarks were used in each CT to determine the hip–knee angle, medial proximal tibial angle, lateral distal femoral angle, medial plateau posterior tibial slope, lateral plateau posterior tibial slope, trochlea angle (TA) to distal femoral angle (TA–DFA) and TA to posterior condylar angle (TA–PCA). Analysis was performed to determine the distributions of each measure across the cohort population.

Results:
--Both the medial and lateral PTS ranged from 5° anterior to 25° posterior.

--22.6% of patients had differential PTS greater than 5°.

--14.5% have greater lateral PTS, whilst 31.0% have greater medial PTS (mean difference to lateral PTS of 5.7°?±?3.2°). 14% of TA–DFAs and 5.2% of TA–PCAs vary greater than 10°.

This study demonstrates a wide variation in tibial slope, differential slope between the medial and lateral tibial plateau as well as variation in the trochlear geometry.

Source: https://link.springer.com/article/10.1007/s00167-021-06725-2
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