Summary: This study assessed 41 patients undergoing meniscal allograft transplantation with up to 13 years of follow-up. MRI (MIMS, T2 mapping), extrusion, and alignment were analyzed. Tibial cartilage showed sustained protection; femoral hydration declined later. Despite structural wear, function remained stable in long-term follow-up, supporting MAT durability.

This prospective study evaluated the long-term evolution of meniscal allografts in a cohort of patients using clinical scales, imaging, and mechanical alignment measures. From an ambispectively collected database, we analyzed 41 patients using magnetic resonance imaging T2 mapping (cartigram), extrusion measurements, mechanical axis deviation, and validated functional outcomes. Magnetic Resonance Imaging (MRI) appearance in Meniscal Transplant Scores (MIMS) declined significantly between follow-ups (p < 0.0001), and tibial cartilage hydration decreased over time. Patients reported a statistically significant reduction in pain (p = 0.0004), and coexisting anterior cruciate ligament rupture was associated with worse functional outcomes. Patients were followed from the date of surgery for up to 13 years. Tibial cartilage showed consistent protection, while femoral cartilage demonstrated early T2 relaxation time increases followed by partial recovery, then deterioration in the long term. Tibial cartilage hydration showed a more gradual decline, typically after 8 years. Structural degeneration (MIMS, extrusion) progressed over time but was not always associated with functional decline. In 13 patients with over 10 years of follow-up, function remained stable despite structural wear, suggesting MAT maintains chondroprotection.

Keywords: Meniscal injury, meniscal allograft transplantation, chondroprotection, meniscal extrusion.

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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
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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
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Association Between Medial Collateral Ligament Injury, Posterior Medial Meniscal Root Injury, And Medial Meniscal Extrusion ePoster Presentation Paulo Vitor Carrijo , MD, BRAZIL Alexandre Zobiole, MD, BRAZIL Davi Casadio, MD, BRAZIL Renan M. Chaim, BRAZIL Moises Cohen, MD, PhD, Prof., BRAZIL Diego Costa Astur, MD, PhD, BRAZIL
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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
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
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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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
Cephalic Laxity of the Posterior Root of Lateral Meniscus (CLPRLM) Classification in Associated With Other Arthroscopic Signs of Meniscal Hyper Mobility ePoster Presentation Pablo David Ramos Murillo, MD, SPAIN
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Bucket Handle Meniscal Tear After ACL Reconstruction: Residual Knee Laxity Treated With Antwerp Monoloop Technique ePoster Presentation Alvaro Valenzuela, MD, CHILE Gonzalo Andres Marambio, MD, CHILE Eithan Goldbaum, MD, CHILE Pablo Armstrong, MD, CHILE José Manuel Irarrázaval Mainguyague, MBBS, CHILE Jose A. Hun, MD, CHILE Peter Verdonk, MD, PhD, BELGIUM
Patients With Advanced Lateral Osteoarthritis Can Return To Sports And Work After Distraction Arthroplasty Plus Lateral Meniscal Allograft Transplantation Combined With Cartilage Repair ePoster Presentation Dhong-Won Lee, MD, PhD, KOREA, REPUBLIC OF Jin-Goo Kim, MD, PhD, KOREA, REPUBLIC OF
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Does Bmi Impact Long-Term Outcomes Of Symptomatic Discoid Meniscus Following Arthroscopic Management? ePoster Presentation Mauricio Drummond, Jr., MD, UNITED STATES Emily Ferreri, BS, UNITED STATES Joseph Nicholas Charla, MS, UNITED STATES Steven Henick, MD, UNITED STATES Emmanuel Mbamalu, MS, UNITED STATES Leila M. Alvandi, PhD, UNITED STATES Edina Gjonbalaj, BS, UNITED STATES Jacob Schulz, UNITED STATES Eric D. Fornari, MD, UNITED STATES
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
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Mid-Term Outcomes Following Repair Of Discoid Meniscus Tears In Pediatric Patients: A Single-Institution Retrospective Review ePoster Presentation Katherine L. Esser, BS, UNITED STATES Larry Chen, BS, UNITED STATES Neehar Desai, BS, UNITED STATES Luilly Vargas, MD, UNITED STATES Caroline Vonck, MD, UNITED STATES Cordelia Carter, MD, UNITED STATES Guillem Gonzalez-Lomas, MD, UNITED STATES Laith M. Jazrawi, MD, UNITED STATES
Delay in progression of OA, better root healing and extrusion correction is seen in concurrent root repair with high tibial osteotomy (HTO) than isolated root repair for moderate varus aligned knees ePoster Presentation Silvampatti Ramasamy Sundararajan, MS(Orth), INDIA Rajagopalakrishnan Ramakanth, D.ortho, DNB(ortho), D.SICOT, INDIA
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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
Fibrin Clot Augmentation of High-Risk Meniscal Repairs May Result in Clinical Healing in up to 90% of Cases ePoster Presentation Peter T. Myers, AM, MBBS, FRACS, FAOrthA, AUSTRALIA Peter Samuel Edward Davies, MBChB, FRCS, UNITED KINGDOM Michael Goldberg, MBBS, FRACS, AUSTRALIA Jon A. Anderson, BAppSci-HMS, MPhil, MBBS, FRACS, FAOrthA, AUSTRALIA
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
No Significant Difference In Meniscus Root Repair Failure Rates Or Patient Reported Outcomes For Patients Greater Than 60-Years-Old. ePoster Presentation Alexandra Stevens, BS, UNITED STATES Robert A. Magnussen, MD, MPH, UNITED STATES Christopher C. Kaeding, MD, UNITED STATES Eric Milliron, BS, UNITED STATES Parker Cavendish, BS, UNITED STATES Tyler Barker, PhD, UNITED STATES Noah Mallory, BE, UNITED STATES James C. Kirven, BS, UNITED STATES David C. Flanigan, MD, UNITED STATES
Ultrasonographic Findings Associated with Medial Meniscus Posterior Root Tear ePoster Presentation Manase Nishimura, MD, JAPAN Yasushi Takata, MD, PhD, JAPAN Yoshihiro Ishida, MD, JAPAN Naoki Takemoto, MD, JAPAN Kentaro Fujita, MD, JAPAN Takuya Sengoku, PT, PhD, JAPAN Yushin Mizuno, MSc, PT, JAPAN Junsuke Nakase, MD, PhD, JAPAN
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
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
Medial Meniscus Tears with Grammar Signs Benefit from Operative Intervention in the Setting of Early Arthritis ePoster Presentation Lydia Mckeithan, MD, UNITED STATES Shannon Tse, BMBS, UNITED STATES Matthew Frederickson, MD, UNITED STATES Jingyanshan Li, MD, UNITED STATES Cassandra Lee, MD, UNITED STATES
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 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
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
The ‘Floating Medial Meniscus’ Lesion In KD3M Knee Dislocations ePoster Presentation Dinshaw Pardiwala, MS(Orth), DNB(Orth), FCPS, INDIA Arzan Jamshed Jesia, MS Orthopaedics, DNB Orthopaedics, FASM, INDIA Clevio Joao Baptista Desouza, MD, INDIA Rammohan Birappa Yedave, DNB orthopedics , MBBS, INDIA
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
Relationship Between Patient-Reported Outcome Measures (Proms) And Mri Abnormalities 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
Usefulness Of Dynamic Ultrasonographic Evaluation For The Diagnosis Of Medial Meniscus Posterior Root Tear ePoster Presentation Kayo Matsumiya, PT, JAPAN Ryosuke Hasama, PT, JAPAN Kenichi Goshima, MD, PhD, JAPAN
Pediatric Failed Meniscus Repair In >5000 Arthroscopic Meniscus Repairs ePoster Presentation Keinan Agonias, BS, UNITED STATES Robert Van Pelt, MPH, UNITED STATES Richard E Bowen, MD Charles M. Chan, MD, UNITED STATES Matthew D. Milewski, MD, UNITED STATES Eric Edmonds, UNITED STATES Ben E. Heyworth, MD, UNITED STATES Philip Wilson, MD, UNITED STATES Kevin G. Shea, MD, UNITED STATES Henry B. Ellis, MD, UNITED STATES Members of the SCORE Quality Improvement Registry, -, UNITED STATES
Unseen Emissions: The Carbon Footprint Of Knee Arthroscopy ePoster Presentation Shannon Tse, BMBS, UNITED STATES Frank Sierra, BS, UNITED STATES Katherine Guo, BS, UNITED STATES Lydia Mckeithan, MD, UNITED STATES Robin Aldwinckle, BMBS, UNITED STATES Cassandra Lee, MD, UNITED STATES Zachary Lum, DO, UNITED STATES
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

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Long-Term Structural and Functional Outcomes Following Meniscal Allograft Transplantation

Long-Term Structural and Functional Outcomes Following Meniscal Allograft Transplantation

Knee Meniscus ePosters

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Long-Term Structural and Functional Outcomes Following Meniscal Allograft Transplantation

Long-Term Structural and Functional Outcomes Following Meniscal Allograft Transplantation