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Tibial slope measure depends on ethnicity, gender and lower-limb alignment
ESSKA Academy. Ollivier M. Nov 8, 2019; 284399; epEKA-72 Topic: Anatomy
Dr. Matthieu Ollivier
Dr. Matthieu Ollivier
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Tibial slope measure depends on ethnicity, gender and lower-limb alignment

ePoster - epEKA-72

Topic: HTO

Ollivier M.1, Pangaud C.1, Jacquet C.1, Li arno S.2, Faizan A.2, Argenson J.-N.1
1IML, Marseille, France, 2Stryker, Mahwah, United States

Purpose: The principal aim of this study was to determine standard values for PTS in healthy individuals using a 3D CT scan method. The secondary aim was to determine the effect of demographic factors and lower frontal-plane alignment on PTS measurement. The relevant hypotheses were that PTS was significantly influenced by demographic factors and lower-limb alignment.
Methods: A CT-scan based modeling and analytics system was used to examine the lower limb of 389 patients (193 males and 185 females, mean age 58.3 ±16.4 (11-92 years), mean BMI 25±4.4 kg/m2) representing Caucasian (n= 219) and Asian (n=170) populations. The average Hip Knee Angle (HKA) was 179,65° (range, 169.9°-190°)). The lateral, medial and global PTS were measured for each patient. All measurements were constructed using algorithm-calculated landmarks, resulting in reproductible and consistent constructs for each specimen. The results were then evaluated upon ethnicity, gender and HKA.
Results: The mean global, medial and lateral PTS were found at 6.26° (range, -5.5°- 14.7°; 1% ³ 12°), 6.18° (range, -4.1°- 17.2°; 3% ³ 12°), and 5.3° (range, -4.7°- 16.2° ; 2% ³ 12°) respectively. The lateral (-1.01; IC95%[0.56; 1,46]; p< 0.0001) and global (-0.44; IC95% [0.03; 0.85]; p=0.03) PTS were significantly smaller in females population. The global PTS was higher (1.91 IC95% (1.51-2.30) p< 0,0001) in the Asian subpopulations. The HKA does significantly correlate with the medial and global PTS. Specimens with varum knee exhibit significant higher global (1.27; IC95% [0.79 - 1.74]; p< 0.0001) and medial (1.87; IC95%[1.28 - 2.47]; p< 0,0001) PTS.
Conclusion: The present study gives a benchmark of the physiologic values of PTS in a healthy population and enlightens several factors influencing tibial slope such as ethnicity, gender and alignment. If no cut-off values can be drawn from our series, anatomical variants with PTS >12° were very uncommon in our Asian and Caucasian population.
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