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The effect of posterior tibial slope on knee flexion in posterior-stabilized total knee arthroplasty

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To evaluate and quantify the effect of the tibial slope on the postoperative maximal knee flexion and stability in the posterior-stabilized total knee arthroplasty (TKA).

Methods

Fifty-six patients (65 knees) who had undergone TKA with the posterior-stabilized prostheses were divided into the following 3 groups according to the measured tibial slopes: Group 1: ≤4°, Group 2: 4°–7° and Group 3: >7°. The preoperative range of the motion, the change in the posterior condylar offset, the elevation of the joint line, the postoperative tibiofemoral angle and the preoperative and postoperative Hospital for Special Surgery (HSS) scores were recorded. The tibial anteroposterior translation was measured using the Kneelax 3 Arthrometer at both the 30° and the 90° flexion angles.

Results

The mean values of the postoperative maximal knee flexion were 101° (SD 5), 106° (SD 5) and 113° (SD 9) in Groups 1, 2 and 3, respectively. A significant difference was found in the postoperative maximal flexion between the 3 groups (P < 0.001). However, no significant differences were found between the 3 groups in the postoperative HSS scores, the changes in the posterior condylar offset, the elevation of the joint line or the tibial anteroposterior translation at either the 30° or the 90° flexion angles. A 1° increase in the tibial slope resulted in a 1.8° flexion increment (r = 1.8, R 2 = 0.463, P < 0.001).

Conclusion

An increase in the posterior tibial slope can significantly increase the postoperative maximal knee flexion. The tibial slope with an appropriate flexion and extension gap balance during the operation does not affect the joint stability.

Level of evidence

Retrospective comparative study, Level III.

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No benefits in any form have been or will be received from any commercial party related either directly or indirectly to the subject of this manuscript.

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Authors and Affiliations

  1. The Orthopedic Department, West China Hospital, Sichuan University, Chengdu, China

    Xiaojun Shi, Bin Shen, Pengde Kang, Jing Yang, Zongke Zhou & Fuxing Pei

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  1. Xiaojun Shi
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  2. Bin Shen
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  3. Pengde Kang
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Correspondence to Bin Shen.

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Shi, X., Shen, B., Kang, P. et al. The effect of posterior tibial slope on knee flexion in posterior-stabilized total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 21, 2696–2703 (2013). https://doi.org/10.1007/s00167-012-2058-7

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  • DOI: https://doi.org/10.1007/s00167-012-2058-7

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