Summary: Decreased dynamic meniscus movement leads to a significant reduction in patient outcomes two years after fully arthroscopic primary medial or lateral meniscus allograft transplantation, resulting in the implementation of the dead allograft sign

Introduction

To evaluate differences in patient-reported outcome measurements between patients
with normal (dME) and decreased sonographic dynamic meniscus extrusion (ndME) following primary
medial or lateral meniscus allograft transplantation (MAT).

Methods

Consecutive patients undergoing primary MAT by a single surgeon between July 2017 and
April 2021 were retrospectively evaluated. MAT was performed using fresh frozen suture-only fixated
allografts. Dynamic ultrasound imaging was performed by two examiners to assess meniscal extrusion
in both unloaded supine and weight-bearing standing positions. Decreased dME cut-off was defined
as <0.5 mm. All patients with a minimum of 2-year clinical follow-up were included in either the dME
(>0.5 mm) or ndME (<0.5 mm) group. Patients were excluded (n=8) based on the following exclusion
criteria: i) age: <18 or >60, ii) cartilage defects exceeding Kellgren-Lawrence grade 2, and iii) MAT
revision surgery. Subjective patient satisfaction after primary MAT was assessed using the IKDC score,
KOOS score, and Lysholm score at a minimum of 2-years follow-up. Clinical outcome scores were
compared using independent t-tests. Significance levels were defined as p < .05.

Results

A total of 26 patients (12 dME, 14 ndME group), with a mean age of 32.3 ±11.0 (dME) and 37
±11.2 (ndME) years, were evaluated at final follow-up of 3.3 ±1.1 (dME) and 3.5 ±1.3 (ndME) years.
Mean dynamic ME was significantly increased in the dME group as compared to the ndME group (1.0
±0.3 mm vs. 0.1 ±0.3 mm, p = <.01). At final 2-year follow-up, significant differences were observed
between the dME and ndME group comparing KOOS scores (89.0 ±8.7 (dME) vs. 71.4 ±24.2 (ndME), p
= .02) and Lysholm scores (93.1 ±9.5 (dME) vs. 76.2 ±24.6 (ndME), p = .03). However, there was no
significant difference for the IKDC score (89.9 ±8.7 (dME) vs. 78.3 ±18.4 (ndME), p = .05).

Conclusion

This study demonstrated that decreased dynamic meniscus extrusion negatively impacts
subjective functional outcomes in patients undergoing primary MAT at minimum 2-year follow-up.

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Analysis of Risk Factors for Medial Meniscus Extrusion Focusing on the Meniscal Tear Type ePoster Presentation Tomoya Iseki, MD, PhD, JAPAN Hiroshi Nakayama, MD., PhD., JAPAN Shintaro Onishi, MD, PhD, JAPAN Ryo Kanto, MD, PhD., JAPAN Yoshitaka Nakao, MD, JAPAN Shunsuke Akai, MD, JAPAN Akira Kawai, MD, JAPAN Hiroki Miya, MD, JAPAN Shota Morimoto, MD, PhD, JAPAN Toshiya Tachibana, MD, PhD, JAPAN
Are Femoral Condyle Volumes Associated with the Injury of the Meniscus? A 3D Evaluation in a Large Cohort Study of ACL-Injured Patients ePoster Presentation Vincenzo Condello, MD, ITALY Anna Ghidotti, MSc, ITALY Daniele Regazzoni, Prof, ITALY Caterina Rizzi, Prof, ITALY Arcangelo Russo, ITALY Marco Collarile, MD, ITALY Vincenzo Madonna, MD, ITALY
Description Of A Novel Surgical Technique For Repairing Complete Radial Tears Of The Lateral Meniscus And Results Of Our Series ePoster Presentation Juan Pablo Zicaro, MD, ARGENTINA Mariano Manuel Zapata, MD, ARGENTINA Mariano Agustin Revah, MD, ARGENTINA Matias Costa-Paz, MD, PhD, ARGENTINA Carlos H. Yacuzzi, MD, ARGENTINA Oscar Alejandro Zicaro, MD, ARGENTINA
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Failure And Complication Rates Following Meniscal All-Inside And Inside-Out Repairs: A Meta-Analysis ePoster Presentation Juan Bernardo Villarreal-Espinosa, MD, UNITED STATES Rodrigo Saad Berreta, BA, UNITED STATES Lucas Pallone, MD, BRAZIL Felicitas Allende Figueroa, MD, ARGENTINA Fernando Gómez Verdejo, MD, MEXICO Zeeshan Khan, BA, UNITED STATES Melissa Carpenter, MD, UNITED STATES Sachin Allahabadi, MD, UNITED STATES Jorge Chahla, MD, PhD, UNITED STATES
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Diagnosis Of Medial Meniscus Posterior Root Tear On Magnetic Resonance Imaging Using Deep Learning ePoster Presentation Yuta Nakanishi, MD, PhD, JAPAN Takehiko Matsushita, MD, PhD, JAPAN Atsuyuki Inui, MD, PhD, JAPAN Kyohei Nishida , MD, PhD, JAPAN Kanto Nagai, MD, PhD, JAPAN Yuichi Hoshino, MD, PhD, JAPAN Ryosuke Kuroda, MD, PhD, JAPAN
Greater Meniscal Extrusion And Inferior Patient Reported Outcomes After Medial Compared To Lateral Meniscal Allograft Transplantation: A 10-Year Follow-Up Using Ultrasound ePoster Presentation Anja M. Wackerle, MD, GERMANY Yunseo Linda Park, BS, UNITED STATES Jumpei Inoue, MD, UNITED STATES Kohei Kamada, MD, PhD, UNITED STATES Zachary J. Herman, MD, UNITED STATES Ehab M. Nazzal, MD, UNITED STATES Janina Kaarre, MD MSc, UNITED STATES Volker Musahl, MD, Prof., UNITED STATES Jonathan D. Hughes, MD, PhD, UNITED STATES Jumpei Inoue, MD, UNITED STATES
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Arthroscopic All-Inside Wrapping Repair of Lateral Meniscus Bucket-Handle Tears: Clinical and Imaging Outcomes ePoster Presentation Kun-Hui Chen, MD, TAIWAN En-Rung Chiang, MD, PhD, TAIWAN Hsuan‑Hsiao Ma, MD, TAIWAN
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Effects of Partial Meniscectomy on in vivo Gait Biomechanics: Systematic Review and Metanalysis ePoster Presentation Enzo Salviato Mameri, MD, MSc, BRAZIL Felipe Gonzalez, MD, UNITED STATES Lucas Pallone, MD, BRAZIL Eliane C. Guadagnin, PhD, BRAZIL Luc Fortier, MD, UNITED STATES Carlos E. S. Franciozi, MD, PhD, Prof., BRAZIL Jonathan A. Gustafson, PhD, UNITED STATES Jorge Chahla, MD, PhD, UNITED STATES Leonardo Metsavaht, MD PhD, BRAZIL Gustavo Leporace, PhD, BRAZIL
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Characteristics of Patients with Discoid Medial Meniscus and Surgical Outcomes: A Multi-center Study in South Korea ePoster Presentation Jun-Ho Kim, MD, KOREA, REPUBLIC OF Joon Ho Wang, MD, PhD, KOREA, REPUBLIC OF Jong-Min Kim, MD, PhD, KOREA, REPUBLIC OF Ki Hyuk Sung, MD, KOREA, REPUBLIC OF Sang Hak Lee, MD, PhD, KOREA, REPUBLIC OF Min Jung, MD, PhD, KOREA, REPUBLIC OF Kyu Sung Chung, MD, PhD, Prof., KOREA, REPUBLIC OF Seong-Hwan Kim, MD,Ph.D, MStat, KOREA, REPUBLIC OF Se-Han Jung, MD, KOREA, REPUBLIC OF
The Usefulness Of Superficial Medial Collateral Ligament Transection In Medial Meniscal Procedures During Medial Open-Wedge High Tibial Osteotomy ePoster Presentation Eiji Sasaki, MD, PhD, JAPAN Yuka Kimura, MD, PhD, JAPAN Takahiro Tsushima, MD, PhD, JAPAN Yukiko Sakamoto, MD, PhD, JAPAN Eiichi Tsuda, Prof., JAPAN Yasuyuki Ishibashi, MD, JAPAN
Knee Injury Detection Using Unsupervised Machine Learning Model ePoster Presentation Gonzalo F. Ferrer, MD, CHILE Francisco Jose Gonzalez Rojas, MD, CHILE Ignacio Andres Muñoz Eichler, Lic, CHILE Alejandro Orizola, CHILE Fernando Radice, MD, CHILE
Similar Re-Rupture Rates After Lateral Posterior Root Rupture Repairs With Or Without Separate Tunnels ePoster Presentation Björn Barenius, MD, PhD, ass. Prof., SWEDEN Christoffer von Essen, MD, PhD, SWEDEN
Biomechanical Effect Of Location And Number Of Bone Tunnels In Transtibial Pull-Out Repair For Medial Meniscus Posterior Root Tear ePoster Presentation Toshitaka Tsunematsu, MD, JAPAN Tomoki Ohori, MD, PhD, JAPAN Akira Tsujii, MD, PhD, JAPAN Shuto Yamashita, MD, JAPAN Ayaka Tanaka, MD, JAPAN Syunya Otani, MD, PhD, JAPAN Seira Sato, MD, PhD, JAPAN Ken Nakata, MD, PhD, JAPAN Seiji Okada, MD, PhD, Prof., JAPAN
Good Results At 10-Year Follow-Up Of Arthroscopic "All Inside" Meniscal Sutures Without Adjuvant Technique ePoster Presentation Ceyran Hamoudi, SWITZERLAND Pierre-Antoine Debordes, MD, SWITZERLAND Jean-Yves Jenny, Prof., FRANCE
Preoperative Knee Cartilage Condition In The Patellofemoral Joint Results In Worse Clinical Outcome Scores 2 Years After Inverted V-Shaped High Tibial Osteotomy ePoster Presentation Dai Sato, MD, PhD, JAPAN Yeonseok Jo, MD, JAPAN Taku Ebata, MD, PhD, JAPAN Yoshiaki Hosokawa, MD, JAPAN Koji Iwasaki, MD, PhD, JAPAN Masatake Matsuoka, PhD, JAPAN Tomohiro Onodera, MD, PhD, JAPAN Eiji Kondo, MD, PhD, JAPAN Norimasa Iwasaki, MD, PhD, JAPAN
Clinical Outcomes with meniscal repair, through the KOOS questionnaire with 2 and 4 year follow-up ePoster Presentation Sergio Patricio González Rouse, MD, MSc, MBA, CHILE Horacio Alejandro Carvajal Araya, MD, CHILE
Impact Of Arthrofibrosis On Meniscal Healing And Retear Rates Following Surgical Repair: A Retrospective Review ePoster Presentation Larry Chen, BS, UNITED STATES Griffith G. Gosnell, MS, UNITED STATES Katherine L. Esser, BS, UNITED STATES Bradley Austin Lezak, MD, MPH, UNITED STATES Caroline Vonck, MD, UNITED STATES Abigail Campbell, MD, UNITED STATES Michael J Alaia, MD, UNITED STATES
Change Of Equivalent Stress On Medial Meniscus Posterior Root After High Tibial Osteotomy: Analysis Using Finite Element Method Using Mri Images ePoster Presentation Yukiko Sakamoto, MD, PhD, JAPAN Eiji Sasaki, MD, PhD, JAPAN Yuka Kimura, MD, PhD, JAPAN Takahiro Tsushima, MD, PhD, JAPAN Hiroto Murayama, Graduate student, JAPAN Kazuhiro Fujisaki, PhD, JAPAN Kotaro Miura, Asst. Prof., JAPAN Kazuhiko Sasagawa, Prof., JAPAN Eiichi Tsuda, Prof., JAPAN Yasuyuki Ishibashi, MD, JAPAN
Clinical And MRI Outcomes Following Meniscal Repair: A Comparison Between Tear Types ePoster Presentation Elias Ammann, MD, SWITZERLAND Jay R. Ebert, PhD, AUSTRALIA Luke Rao, MD, AUSTRALIA Antony Liddell, FRACS(Orth), FAOrthA, AUSTRALIA Usman Najeeb Bhatty, FRCS, MB ChB, BSc, UNITED KINGDOM Ross Radic, MBBS FRACS (Ortho) FAOrthA, AUSTRALIA
Serial Changes In Muscle Strength And Dynamic Balance After Lateral Meniscal Allograft Transplantation ePoster Presentation Dhong-Won Lee, MD, PhD, KOREA, REPUBLIC OF Jin-Goo Kim, MD, PhD, KOREA, REPUBLIC OF Byeong Sun Park, KOREA, REPUBLIC OF
Magnetic Resonance Imaging at 120° Flexed-Knee Position is a Novel Method for Preoperative Detection of Meniscal Ramp Lesion in Anterior Cruciate Ligament-Injured Knee ePoster Presentation Satoshi Nonaka, MD, JAPAN Kazuhisa Hatayama, MD, PhD, JAPAN Hibiki Kakiage, MD, JAPAN Masanori Terauchi, MD, JAPAN HIrotaka Chikuda, MD, PhD, JAPAN
A Novel Method for Evaluating the Effect of a Lateral Meniscus Posterior Root Tear on the Loaded Mechanics of a Human Cadaveric Knee’s Lateral Compartment ePoster Presentation Edward Hoptioncann, BASc, CANADA Jordan Broberg, PhD, CANADA Parth Lodhia, MD, FRCSC, CANADA David R. Wilson, DPhil, CANADA Andrew Yung, MASc, CANADA Kirsten Bale, BSc, CANADA
Virtual Computer Vision Based Rehabilitation And In Person Physical Therapy Have Equivalent Outcomes After Knee Arthroscopy ePoster Presentation Katherine L. Esser, BS, UNITED STATES Zachary I Li, BA, UNITED STATES Michael Moore, BA, UNITED STATES Larry Chen, BS, UNITED STATES Isabel Wolfe, BA, UNITED STATES Nathaniel P. Mercer, MD, UNITED STATES Bradley Austin Lezak, MD, MPH, UNITED STATES Heath Patrick Gould, MD, UNITED STATES Laith M. Jazrawi, MD, UNITED STATES Eric Strauss, UNITED STATES Guillem Gonzalez-Lomas, MD, UNITED STATES
Repair Of Isolated Traumatic Lateral Meniscal Injury Yields Comparable Clinical Outcomes In Young And Middle-Aged Patients ePoster Presentation Kodai Hamaoka, MD, JAPAN Shinichiro Okimura, MD, PhD, JAPAN Kazushi Horita, MD, JAPAN Yasutoshi Ikeda, MD,PhD, JAPAN Yohei Okada, MD,PhD, JAPAN Tomoaki Kamiya, MD, JAPAN Atsushi Teramoto, MD, PhD, JAPAN
How Successful Are Meniscal Repair All-Inside Implants During Deployment? ePoster Presentation David C. Flanigan, MD, UNITED STATES Emma Flanigan, research student, UNITED STATES Sonu Bae, BS, UNITED STATES Tyler Barker, PhD, UNITED STATES
Suture Versus Bony Fixation Techniques In Meniscal Allograft Transplantation (Mat) Outcomes; A Meta-Analysis ePoster Presentation Iswadi Damasena, MD, FRACS, AUSTRALIA James Onggo, MBBS(Hons), AUSTRALIA Rahul Kakria, MD, AUSTRALIA
Medial Meniscus Dynamics In Degenerative Meniscus Tears: Analyzing Extrusion And Horn Position Shift In Early Knee Osteoarthritis ePoster Presentation Kentaro Fujita, MD, JAPAN Yasushi Takata, MD, PhD, JAPAN Tomoyuki Kanayama, MD, JAPAN Yoshihiro Ishida, MD, JAPAN Naoki Takemoto, MD, JAPAN Manase Nishimura, MD, JAPAN Takuya Sengoku, PT, PhD, JAPAN Yushin Mizuno, MSc, PT, JAPAN Junsuke Nakase, MD, PhD, JAPAN
Joint Line Obliquity Can Increase Meniscus Root Tension ePoster Presentation Shuntaro Nejima, MD, PhD, JAPAN Andy Williams, MBBS, FRCS(Orth), FFSEM(UK), UNITED KINGDOM Andrew A. Amis, FREng, DSc, PhD, UNITED KINGDOM
Proof Of Concept Of A Novel Surgical Technique To Improve The Treatment Of Horizontal Cleavage Meniscus Tears: “The Quad Tendon Augmentation Technique”. ePoster Presentation Maximiliano Ibañez, MD, SPAIN Caroline Mouton, PhD, LUXEMBOURG Felix Hoffmann, MD, LUXEMBOURG Romain Seil, MD, Prof., LUXEMBOURG
Relative Meniscal Extrusion After Meniscal Allograft Transplantation Progressed During A Long-Term Follow-Up: Average 11 Years Follow-Up Longitudinal Magnetic Resonance Imaging Study ePoster Presentation Sang-Min Lee, Prof., KOREA, REPUBLIC OF Lih Wang, MD, PhD, KOREA, REPUBLIC OF Jung Shin Kim, Prof., KOREA, REPUBLIC OF Won Chul Shin, Prof., KOREA, REPUBLIC OF
Early Complications Following Open Parameniscal And Popliteal Cyst Excision Of The Knee ePoster Presentation Marlena Ramanis, BS, BA, UNITED STATES Kory B. Dylan Pasko, BS, UNITED STATES Dean Wang, MD, UNITED STATES
Partial Central Meniscectomy With Using Of An Additional Stabilization Sutures Of The Lateral Discoid Meniscus As A Method Of Preventing Meniscus Extrusion In The Postoperative Period ePoster Presentation Kateryna Honchar, resident doctor, UKRAINE Yuriy Sobolevskiy, PhD, UKRAINE Oleksandr Burianov, MD, PhD, Prof, UKRAINE
Detailed Anatomy of the Meniscotibial Ligament and Clock Face Position of Meniscal Attachments in the Tibia ePoster Presentation Keiichi Yoshida, MD, PhD, JAPAN Youngji Kim, MD, PhD, JAPAN Haruka Kaneko, JAPAN Yoshitomo Saita, MD, PhD, JAPAN Mitsuaki Kubota, MD, PhD, JAPAN Muneaki Ishijima, MD, PhD, JAPAN
Magnetic Resonance Imaging Findings of the Medial Meniscus in Early-stage Osteoarthritis of the Knee ePoster Presentation Yasushi Takata, MD, PhD, JAPAN Junsuke Nakase, MD, PhD, JAPAN Yoshihiro Ishida, MD, JAPAN Naoki Takemoto, MD, JAPAN Manase Nishimura, MD, JAPAN Takuya Sengoku, PT, PhD, JAPAN Yushin Mizuno, MSc, PT, JAPAN
Improved Healing Rates Of Meniscal Repair With Concomitant Posterior Cruciate Ligament Reconstruction Compared To Meniscal Repair Alone ePoster Presentation Nathan Varady, MD, MBA, UNITED STATES Suhas Parise, BS, UNITED STATES Riley J. Williams, MD, UNITED STATES
Long-Term Structural and Functional Outcomes Following Meniscal Allograft Transplantation ePoster Presentation Deidre López Guardiola, MD, MEXICO Francisco Cruz López, MD, MEXICO

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The Static Allograft - Decreased Dynamic Meniscal Extrusion Alters Clinical Success 2 years after primary Medial or Lateral Meniscus Allograft Transplantation

The Static Allograft - Decreased Dynamic Meniscal Extrusion Alters Clinical Success 2 years after primary Medial or Lateral Meniscus Allograft Transplantation

Introduction

Methods

Results

Conclusion

Knee Meniscus ePosters

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The Static Allograft - Decreased Dynamic Meniscal Extrusion Alters Clinical Success 2 years after primary Medial or Lateral Meniscus Allograft Transplantation

The Static Allograft - Decreased Dynamic Meniscal Extrusion Alters Clinical Success 2 years after primary Medial or Lateral Meniscus Allograft Transplantation

Introduction

Methods

Results

Conclusion