The Posterior Tibial Slope Does Not Influence the Flexion Angle in Posterior-stabilized Mobile-bearing Total Knee Arthroplasty

Overview

Journal Arthroplasty

Publisher Biomed Central

Date 2022 Mar 3

PMID 35236482

Authors

Susumu Takemura

Tessyu Ikawa

Yohei Ohyama

Mitsunari Kim

Kunio Takaoka

Yukihide Minoda

Yoshinori Kadoya

Affiliations

Soon will be listed here.

Abstract

Background: It remains uncertain whether an increase in the tibial slope leads to better flexion in posterior-stabilized (PS) total knee prostheses.

Purpose: To compare the intra-operative flexion angle between standard and an additional 10° posterior slope inserts.

Patients And Methods: Between December 2014 and February 2015, 22 patients (25 knees) who underwent PS mobile-bearing primary total knee arthroplasty (TKA) were included. Flexion angles were measured using either standard or specially-made inserts. Differences in flexion angles between the two situations were analyzed to determine the relationship between changes in flexion angle and pre-operative flexion angle or body mass index (BMI), and between intra- and post-operative flexion angle.

Results: The difference between the average flexion angle of standard inserts and specially-made inserts was not statistically significant. Although the correlations between changes in flexion angle due to insert difference and flexion angle, pre-operative flexion angle or BMI were not significant, there was a positive correlation between intra-operative and post-operative flexion at 2 years.

Conclusion: The results showed an additional posterior tibial slope by 10° did not affect the intra-operative flexion angle. Surgeons performing PS mobile-bearing TKA do not need to excessively slope the tibial bone cutting to improve the post-operative flexion angle.

Level Of Evidence: I, Experimental study.

Citing Articles

No significant clinical differences between native or reduced posterior tibial slope in kinematically aligned total knee replacement with posterior cruciate-retaining.

Cacciola G, Giustra F, Bosco F, Vezza D, Pirato F, Braconi L J Orthop. 2024; 54:32-37.

PMID: 38524363 PMC: 10957378. DOI: 10.1016/j.jor.2024.03.023.

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