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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 7/2015

01-07-2015 | Knee

A matched-pair comparison of two different locking plates for valgus-producing medial open-wedge high tibial osteotomy: peek–carbon composite plate versus titanium plate

Authors: Matthias Cotic, Stephan Vogt, Stefan Hinterwimmer, Matthias J. Feucht, Julia Slotta-Huspenina, Tibor Schuster, Andreas B. Imhoff

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 7/2015

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Abstract

Purpose

The first purpose of this study was to compare the clinical and radiographic outcome of two different locking plates used for valgus-producing medial open-wedge high tibial osteotomy (HTO). The second purpose was to histologically evaluate peek–carbon wear for biocompatibility.

Methods

Twenty-six consecutive patients undergoing open-wedge HTO using the first-generation PEEKPower HTO-Plate® (Group I) were matched with 26 patients after open-wedge HTO with the TomoFix™ plate (Group II). Clinical scores (visual analogue scale for pain, WOMAC, Lysholm score) were obtained preoperatively and at a minimum follow-up of 24 months postoperatively. Fixation stability was evaluated radiographically by comparing the medial proximal tibial angle (MPTA) and tibial slope 2 days after open-wedge HTO and after implant removal. Tissue samples of Group I were collected at the time of implant removal for histologic evaluation.

Results

Implant-related complications occurred in 15 % (n = 4) of Group I and 0 % of Group II. Out of them, 3 implant replacements were excluded from statistical analyses. After a final median follow-up of 25 months (range 24–31), the clinical scores in both groups showed significant improvements compared to preoperatively (visual analogue scale, WOMAC, Lysholm score; p < 0.001), without significant group differences (visual analogue scale, n.s.; WOMAC, n.s.; Lysholm score, n.s.). No significant differences between baseline and follow-up measurements for MPTA and tibial slope were observed within each group (MPTA: Gr. I, n.s.; Gr. II, n.s.; tibial slope: Gr. I, n.s.; Gr. II, n.s.) or between the two groups (MPTA, n.s.; tibial slope, n.s.). In histologic samples, CF PEEK abrasion did not induce inflammation or tissue necrosis.

Conclusion

The first-generation PEEKPower HTO-Plate® provided a higher rate of implant-related complications compared to the TomoFix™ plate at a minimum follow-up of 24 months after valgus-producing open-wedge HTO. Therefore, it is not recommended to use the first-generation PEEKPower HTO-Plate® in the clinical practice.

Level of evidence

III.
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Metadata
Title
A matched-pair comparison of two different locking plates for valgus-producing medial open-wedge high tibial osteotomy: peek–carbon composite plate versus titanium plate
Authors
Matthias Cotic
Stephan Vogt
Stefan Hinterwimmer
Matthias J. Feucht
Julia Slotta-Huspenina
Tibor Schuster
Andreas B. Imhoff
Publication date
01-07-2015
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 7/2015
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-014-2914-8

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