Okazaki, Yuki Department of Orthopaedic Surgery, Okayama University Hospital
Okazaki, Yoshiki Department of Orthopaedic Surgery, Okayama University Hospital
Masuda, Shin Department of Orthopaedic Surgery, Okayama University Hospital
Hiranaka, Takaaki Department of Orthopaedic Surgery, Okayama University Hospital
Kodama, Yuya Department of Orthopaedic Surgery, National Hospital Organization Iwakuni Clinical Center
Kamatsuki, Yusuke Department of Orthopaedic Surgery, Kochi Health Science Center
Miyazawa, Shinichi Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences ORCID
Tetsunaga, Tomonori Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences Kaken ID
Background Medial meniscus (MM) medial extrusion in the coronal plane does not always improve, even after repair. This study aimed to determine the extent of posteromedial extrusion of the MM during knee flexion before and after MM pullout repair using three-dimensional magnetic resonance imaging (MRI). Methods Data from 14 patients (mean age, 63.4 years; 86% female) who had undergone MM pullout repair at the current institution between August 2017 and October 2018 were retrospectively reviewed. The MRIs were performed pre-operatively and ≥ 3 months postoperatively. Three-dimensional MRIs of the tibial surface and MM were evaluated using Tsukada's measurement method before and after pullout repair. The expected center of MM posterior root attachment (point A), the point on the extruded edge of the MM farthest away from point A (point E), and the point of intersection of a line through the posteromedial corner of the medial tibial plateau and a line connecting points A and E (point I) were identified. Subsequently, the pre-operative and postoperative AE and IE distances were calculated and compared. Results Point E was laterally shifted by the pullout repair, whereas point I showed no significant change. The postoperative IE distance (6.7 mm) was significantly shorter than the pre-operative one (9.1 mm, P < 0.01). The postoperative AE distance (29.3 mm) was significantly shorter than the pre-operative one (31.5 mm, P < 0.01). Conclusions The AE and IE distances significantly decreased after MM posterior root repair, suggesting that transtibial pullout repair may be useful in reducing posteromedial extrusion of the MM.
Magnetic resonance imaging
Posterior root tear
This fulltext is available in Feb. 2021.
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