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31.05.2016 | Knee | Ausgabe 11/2017

Knee Surgery, Sports Traumatology, Arthroscopy 11/2017

Assessment of the midflexion rotational laxity in posterior-stabilized total knee arthroplasty

Zeitschrift:
Knee Surgery, Sports Traumatology, Arthroscopy > Ausgabe 11/2017
Autoren:
Kazunori Hino, Tatsuhiko Kutsuna, Yoshio Oonishi, Kunihiko Watamori, Hiroshi Kiyomatsu, Yasutake Iseki, Seiji Watanabe, Yasumitsu Ishimaru, Hiromasa Miura

Abstract

Purpose

To evaluate changes in midflexion rotational laxity before and after posterior-stabilized (PS)-total knee arthroplasty (TKA).

Methods

Twenty-nine knees that underwent PS-TKA were evaluated. Manual mild passive rotational stress was applied to the knees, and the internal–external rotational angle was measured automatically by a navigation system at 30°, 45°, 60°, and 90° of knee flexion.

Results

The post-operative internal rotational laxity was statistically significantly increased compared to the preoperative level at 30°, 45°, 60°, and 90° of flexion. The post-operative external rotational laxity was statistically significantly decreased compared to the preoperative level at 45° and 60° of flexion. The post-operative internal–external rotational laxity was statistically significantly increased compared to the preoperative level only at 30° of flexion. The preoperative and post-operative rotational laxity showed a significant correlation at 30°, 45°, 60°, and 90° of flexion.

Conclusion

Internal–external rotational laxity increases at the initial flexion range due to resection of both the anterior or posterior cruciate ligaments and retention of the collateral ligaments in PS-TKA. Preoperative and post-operative rotational laxity indicated a significant correlation at the midflexion range. This study showed that a large preoperative rotational laxity increased the risk of a large post-operative laxity, especially at the initial flexion range in PS-TKA.

Level of evidence

III.

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