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- Title
Posteromedial vertical capsulotomy selectively increases the extension gap in posterior stabilized total knee arthroplasty.
- Authors
Masuda, Shin; Miyazawa, Shinichi; Yuya, Kodama; Kamatski, Yusuke; Tomohito, Hino; Yoshiki, Okazaki; Yuki, Okazaki; Furumatsu, Takayuki; Ozaki, Toshifumi
- Abstract
<bold>Purpose: </bold>In total knee arthroplasty (TKA), it is important to obtain an appropriate flexion-extension gap. The extension gap is expanded by posteromedial vertical capsulotomy (PMVC). This study aimed to evaluate the increase in the extension gap by PMVC using a navigation system.<bold>Methods: </bold>In posterior stabilized (PS)-type TKA, PMVC was performed in 37 knees. The medial extension gap at 0° and flexion gap at 90° flexion of the knee joint using the navigation system before and after PMVC were measured.<bold>Results: </bold>The extension gap before the PMVC was 5.3 ± 2.9 mm. After PMVC, the extension gap had significantly increased to 8.0 ± 2.8 mm (p < 0.001). In addition, the flexion gap was 8.1 ± 2.7 mm before the PMVC, but it was 8.7 ± 2.8 mm after the PMVC, and the flexion gap was not enlarged (n.s.).<bold>Conclusion: </bold>In PS-type TKA, it is possible to obtain selective expansion of about 2.7 mm of the extension gap by PMVC. Therefore, gap balance can be acquired by soft-tissue treatment while preserving the bone. The PMVC was a useful method for acquiring gap balance and preserving the bone stock.<bold>Level Of Evidence: </bold>IV.
- Subjects
TOTAL knee replacement; ARTHROPLASTY; SOFT tissue injuries; THERAPEUTICS; KNEE; KNEE surgery; KNEE diseases; RANGE of motion of joints; OSTEOARTHRITIS
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2020, Vol 28, Issue 5, p1419
- ISSN
0942-2056
- Publication type
journal article
- DOI
10.1007/s00167-019-05511-5