Yoshiki Okazaki1, Takayuki Furumatsu2, Takatsugu Yamauchi3, Yuki Okazaki1, Yusuke Kamatsuki4, Takaaki Hiranaka1, Yuya Kajiki1, Ximing Zhang1, Toshifumi Ozaki1. 1. Department of Orthopaedic Surgery, Okayama University Graduate School, 2-5-1 Shikata-cho, Kitaku, Okayama, 700-8558, Japan. 2. Department of Orthopaedic Surgery, Okayama University Graduate School, 2-5-1 Shikata-cho, Kitaku, Okayama, 700-8558, Japan. matino@md.okayama-u.ac.jp. 3. Division of Radiology, Medical Technology Department, Okayama University Hospital, 2-5-1 Shikata-cho, Kitaku, Okayama, 700-8558, Japan. 4. Department of Orthopaedic Surgery, Kochi Health Science Center, 2125-1 Ike, Kochi, Kochi, 781-8555, Japan.
Abstract
PURPOSE: Transtibial repair of a medial meniscus posterior root tear (MMPRT) can improve clinical outcomes, although meniscal extrusion remains. However, few studies have investigated the volume of meniscal extrusion. This study aimed to evaluate the effect of transtibial repair in reducing the volume using three-dimensional (3D) magnetic resonance imaging, at 10° and 90° knee flexion. METHODS: Twenty patients with MMPRTs and 16 volunteers with normal knees participated. The 3D models of meniscus were constructed using SYNAPSE VINCENT®. The meniscal extrusion and its volume were measured at 10° and 90° knee flexion. Differences between the pre- and postoperative examinations were assessed using the Wilcoxon signed-rank test. The postoperative parameters were compared to those in patients with normal knees. RESULTS: There were no significant pre- and postoperative differences in any parameter at 10° knee flexion. At 90° knee flexion, the posterior extrusion and its meniscal volume were decreased significantly after transtibial repair (p < 0.05), even though these parameters were larger than in the normal knees. On the other hand, intra-articular meniscal volume calculated by the extrusion volume was increased to the level of the normal knee. CONCLUSIONS: This study demonstrated that transtibial repairs improved the intra-articular/intra-tibial surface volume of the medial meniscus by reducing the posteromedial extrusion during knee flexion. This 3D analysis is clinically relevant in evaluating that, while transtibial root repair has a limited ability to reduce meniscal extrusion, it can restore the functional volume of the medial meniscus which contributes to the shock absorber postoperatively. LEVEL OF EVIDENCE: IV.
PURPOSE: Transtibial repair of a medial meniscus posterior root tear (MMPRT) can improve clinical outcomes, although meniscal extrusion remains. However, few studies have investigated the volume of meniscal extrusion. This study aimed to evaluate the effect of transtibial repair in reducing the volume using three-dimensional (3D) magnetic resonance imaging, at 10° and 90° knee flexion. METHODS: Twenty patients with MMPRTs and 16 volunteers with normal knees participated. The 3D models of meniscus were constructed using SYNAPSE VINCENT®. The meniscal extrusion and its volume were measured at 10° and 90° knee flexion. Differences between the pre- and postoperative examinations were assessed using the Wilcoxon signed-rank test. The postoperative parameters were compared to those in patients with normal knees. RESULTS: There were no significant pre- and postoperative differences in any parameter at 10° knee flexion. At 90° knee flexion, the posterior extrusion and its meniscal volume were decreased significantly after transtibial repair (p < 0.05), even though these parameters were larger than in the normal knees. On the other hand, intra-articular meniscal volume calculated by the extrusion volume was increased to the level of the normal knee. CONCLUSIONS: This study demonstrated that transtibial repairs improved the intra-articular/intra-tibial surface volume of the medial meniscus by reducing the posteromedial extrusion during knee flexion. This 3D analysis is clinically relevant in evaluating that, while transtibial root repair has a limited ability to reduce meniscal extrusion, it can restore the functional volume of the medial meniscus which contributes to the shock absorber postoperatively. LEVEL OF EVIDENCE: IV.
Authors: Jin Woo Jin; Jin Goo Kim; Joon Ho Wang; Jungyeun Tae; Jun Ho Kim; Byung Hoon Lee; Jun Yong Park; Do Kyung Lee Journal: Arthrosc Tech Date: 2022-04-22