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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 12/2023

18-10-2023 | KNEE

Effect of posteromedial vertical capsulotomy with medial collateral ligament liberation on intraoperative medial component gap mismatch between extension and mid-flexion during total knee arthroplasty

Authors: Hiroki Katagiri, Ryusuke Saito, Mikio Shioda, Tetsuya Jinno, Ryutaku Kaneyama, Toshifumi Watanabe

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 12/2023

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Abstract

Purpose

The aim of this study was to quantify the effect of posteromedial vertical capsulotomy on intraoperative component gaps and angles from extension through mid-flexion to flexion during total knee arthroplasty (TKA).

Methods

In the present study, 47 cases of primary posterior-stabilized TKA using the measured resection technique for varus knee osteoarthritis (hip–knee–ankle angles < 0°) were reviewed. Component gaps and angles at 0°, 10°, 45°, 90°, and maximum flexion were measured intraoperatively, before and after posteromedial vertical capsulotomy. Differences in pre- and post-posteromedial vertical capsulotomy medial and lateral component gaps and angles and medial component gap mismatches among knee flexion angles were assessed using the Wilcoxon signed rank test for two paired samples.

Results

The medial component gaps at 0° and 10° of flexion of post-posteromedial vertical capsulotomy were significantly greater, exceeding the minimal detectable change, than those pre posteromedial vertical capsulotomy (change of the gap after the procedure at 0° of flexion was 0.7 ± 0.7 mm and at 10° of flexion was 0.8 ± 0.8 mm; all P values < 0.05). The medial component gap mismatches between both 0° and 10°, and 45°, 90°, and maximum flexion were significantly smaller post posteromedial vertical capsulotomy than pre posteromedial vertical capsulotomy, with the values of the change exceeding the minimal detectable change (change of the gap mismatch after the procedure: knee flexion at 0° and 45° was − 0.6 ± 0.9 [mm], at 0° and 90° was 0.7 ± 1.0, at 0° and maximum flexion was − 0.6 ± 1.2, at 10° and 45° was − 0.7 ± 0.9, at 10° and 90° was − 0.8 ± 0.9, at 10° and maximum flexion was − 0.7 ± 1.1; all P values < 0.05).

Conclusions

Posteromedial vertical capsulotomy increased the medial component gaps during knee extension but not during mid-flexion or full flexion during posterior-stabilized TKA. Posteromedial vertical capsulotomy improved mild medial component gap mismatch between extension and mid-flexion and full flexion during posterior-stabilized TKA. Surgeons can consider posteromedial vertical capsulotomy when there is intraoperative constriction of the medial component gap during extension in patients undergoing posterior-stabilized TKA.
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Metadata
Title
Effect of posteromedial vertical capsulotomy with medial collateral ligament liberation on intraoperative medial component gap mismatch between extension and mid-flexion during total knee arthroplasty
Authors
Hiroki Katagiri
Ryusuke Saito
Mikio Shioda
Tetsuya Jinno
Ryutaku Kaneyama
Toshifumi Watanabe
Publication date
18-10-2023
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 12/2023
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-023-07610-w

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