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Changes in the Posterior Tibial Slope among Patients undergoing Medial Unicompartmental Knee Arthroplasty do not affect the Medial Proximal Tibial Angle

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Changes in the Posterior Tibial Slope among Patients undergoing Medial Unicompartmental Knee Arthroplasty do not affect the Medial Proximal Tibial Angle

Lorenz Pichler, MD, AUSTRIA Rosa Berndt, MD, GERMANY Carsten Perka, MD, PhD, GERMANY Clemens Gwinner, MD, GERMANY Moses Kamal Dieter El Kayali, MD, GERMANY

Charité - University Medicine Berlin, Berlin, Berlin, GERMANY

2025 Congress ePoster Presentation 2025 Congress Not yet rated

Anatomic Location

Knee

Anatomic Structure

Cartilage

Diagnosis / Condition

Arthritis

Treatment / Technique

Arthroplasty

Summary: The significant change in posterior tibial slope experienced by patients undergoing medial unicompartmental knee arthroplasty does not affect the medial proximal tibial angle.

Background

Recommendations regarding the surgical modification of the posterior tibial slope (PTS) in medial unicompartmental knee arthroplasty (UKA) vary among knee system manufacturers. However, most systems recommend a specific target PTS. Given its high variability among patients undergoing UKA, this often results in a significant change of patients’ PTS. However, it remains unclear whether this change in PTS further impacts the coronal alignment of patients' knees, specifically the medial proximal tibial angle (MPTA).

Purpose

The purpose of this study was to report on the change in the MPTA and its potential correlation with the change of PTS in patients undergoing conventional medial UKA.

Methods

Pre- and postoperative radiographs of 96 patients undergoing conventional medial UKA using the Oxford Partial Knee System (Zimmer Biomet, Warsaw, USA), for which a postoperative PTS of 7 degrees is recommended, were analyzed. Pre- and postoperative MPTA and PTS were measured on anterior-posterior and lateral radiographs by two observers, according to the methods described by Petersen & Engh (MPTA) and Dejour & Bonnin (PTS), and reported. The differences in pre- to postoperative MPTA and PTS, as well as the difference between the mean postoperative PTS and the target value of 7 degrees, were tested for statistical significance using two-sided and one-sided Student's t-tests. The Pearson correlation coefficient was used to assess the correlation between changes in MPTA and changes in PTS.

Results

With a mean preoperative MPTA of 85.39° (SD 2.34°) and a mean postoperative MPTA of 84.12° (SD 2.55), UKA resulted in an average change in MPTA of -1.28° (SD 2.55; p < 0.001). The mean PTS was reported as 9.27° (SD 3.41°) preoperatively and 7.25° (SD 2.23°) postoperatively, with a mean change of -2.02° (SD 3.84°; p < 0.001). Overall, 71.7% of cases had a postoperative PTS within ± 2 degrees of 7 degrees, and there was no statistically significant difference between the mean postoperative PTS and the target value of 7 degrees (p = 0.797). The Pearson correlation coefficient revealed a no correlation (r = 0.05) between the change in MPTA and the change in PTS.

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Does Robotic Assistance In Total Knee Arthroplasty Improve Preoperative Planning And Intraoperative Decision-Making? ePoster Presentation David H. Figueroa, MD, CHILE Waldo Gonzalez Duque, MD, CHILE Rafael Calvo, MD, CHILE Francisco Figueroa, MD, CHILE
Soft Tissue Balancing In Robotic-Assisted Total Knee Arthroplasty ePoster Presentation Tomoya Takasago, MD, PhD, JAPAN Katsutoshi Miyatake, MD, PhD, JAPAN Akihiro Nagamachi, MD, PhD, JAPAN
Knees With Lateral Compartment Osteoarthritis Show A Substantial Variability In Functional Knee Phenotypes With Gender-Specific And Age-Related Differences: Phenotypic Analysis Of 305 Knees ePoster Presentation Gaby Victoria Ten Noever De Brauw, NETHERLANDS Tarik Bayoumi, MD, NETHERLANDS Lindsey Ruderman, BA, UNITED STATES Gino M. M. J. Kerkhoffs, MD, PhD, Prof., NETHERLANDS Hendrik Aernout Zuiderbaan, MD PhD, NETHERLANDS Andrew D. Pearle, MD, UNITED STATES
Local Soft Tissue Thickness in Unicompartimental Knee Arthroplasty: Strong Inter-Parameter Correlation, Moderate Correlation with BMI, and no Impact on Implant Positioning ePoster Presentation Lorenz Pichler, MD, AUSTRIA Moses Kamal Dieter El Kayali, MD, GERMANY Rosa Berndt, MD, GERMANY Carsten Perka, MD, PhD, GERMANY Clemens Gwinner, MD, GERMANY Danko Dan Milinkovic, MD, GERMANY
Oxford Partial Knee Femoral Sizing Via Preoperative Mri Scan – A Novel Template Method ePoster Presentation Ritwik Kejriwal, FRACS(Orth), NEW ZEALAND
Changes In Tibial Insert Design Can Alter Knee Kinematics And Tibiofemoral Stress Distributions In Total Knee Arthroplasty ePoster Presentation Shinichi Kuriyama, MD, PhD, JAPAN Sayako Sakai, MD, JAPAN Yugo Morita, MD, PhD, JAPAN Kohei Nishitani, MD, PhD, JAPAN Shinichiro Nakamura, MD, PhD, JAPAN Shuichi Matsuda, MD, PhD, JAPAN
Knee Joint Synovitis After Total Knee Arthroplasty is Not Correlated to Patient Satisfaction Score ePoster Presentation Kristen I Barton, MD, PhD, UNITED STATES Alexandra Rocha, MD, CANADA Robert Dima, PhD, CANADA Kevin R Boldt, PhD, CANADA Holly Philpott, PhD, CANADA Lyndsay Somerville, PhD, CANADA C. Thomas Appleton, MD, PhD, CANADA Brent Lanting, MD, FRCSC, CANADA
Virtual Reality Simulator For Knee Arthroplasty: Evaluating Content And Face Validity For Orthopaedic Residency Training ePoster Presentation Conor Rankin, MRCS MBChB BMedSci AFHEA, UNITED KINGDOM Joseph E McKay, MBChB BSc MRCS MMEd, UNITED KINGDOM Christopher Thornhill, BM BS BSc (Hons) MRCS, UNITED KINGDOM Roberto Alho, MBBS BSc MPhil FRCS, UNITED KINGDOM Rahul Bhattacharyya, MBCHB (Hons), MD (Res), FRCS (Orth), MSc, MRCS, UNITED KINGDOM J Donald Hansom, FRCS, MD, MBChB, BSc (Hons), UNITED KINGDOM
Longer Hospital Length of Stay After Total Knee Arthroplasty is an Independent Risk Factor for Increased Complication Rates ePoster Presentation Logan Finger, MD, UNITED STATES Kelly A Murphy, BS, UNITED STATES Kenneth Urish, MD, PhD Michael O'Malley, MD, UNITED STATES Brian Klatt, MD, UNITED STATES Johannes F. Plate, MD, PhD, UNITED STATES
Changes In Foot Pressure Among Patients With Varus Knee Osteoarthritis Undergoing Bilateral Simultaneous Total Knee Arthroplasty – A Prospective Observational Pedobarographic Assessment ePoster Presentation Roop Bhushan Kalia, M.S (Orthopaedics), INDIA Divyansh Sharma, MBBS,M.S (Orthopaedics), INDIA Pradeep Kumar Meena, MBBS,M.S(Orthopaedics), INDIA Raj Kumar Yadav, MBBS,M.D, INDIA Ankit Gaurav, MS ORTHOPAEDICS, INDIA
Acute Postoperative Pain Is An Independent Risk Factor Associated With Chronic Postoperative Pain After Total Knee Arthroplasty ePoster Presentation Takuya Iseki, MD, PhD, JAPAN Tomoya Iseki, MD, PhD, JAPAN Yoshitaka Nakao, MD, JAPAN Hiroshi Nakayama, MD., PhD., JAPAN Toshiya Tachibana, MD, PhD, JAPAN
Long-Term Mortality Outcomes In Total Knee Arthroplasty Patients Under 60 ePoster Presentation Samuel Jaeyoon Won, MD, KOREA, REPUBLIC OF Sang Hyo Kim, KOREA, REPUBLIC OF Hee Yoon Chung, M.D., KOREA, REPUBLIC OF Wonseok Lee, MD, KOREA, REPUBLIC OF Chong Bum Chang, MD, PhD, KOREA, REPUBLIC OF
A Novel Knee Intra-Operative Classification Of Osteo-Arthritis (KICO) ePoster Presentation Geoffrey Murphy, MD, AUSTRALIA Simon Luc Edmond Walgrave, MD, BELGIUM Alexander S. Nicholls, MSc, FRACS, AUSTRALIA Myles R. J. Coolican, FRACS, AUSTRALIA David A. Parker, MBBS, BMedSc, FRACS, AUSTRALIA Brett A. Fritsch, MBBS BSc(Med), FRACS, FAOrthA, AUSTRALIA
Association Between Prosthetic Component Malalignment and Post-Total Knee Arthroplasty Pain ePoster Presentation Luke James Naunton, UNITED KINGDOM Oday Al-Dadah, MBChB, MD, FRCS (Tr & Orth), UNITED KINGDOM
Investigating Patient And Surgical Factors Affecting Same Day Discharge After Unicompartmental Knee Replacement ePoster Presentation Suleyman Ulla, MBChB, UNITED KINGDOM Patrick Richard Michael Nicholas, MBChB, MRCS(Glasg), UNITED KINGDOM Stuart Wilson Bell, MBChB MRCP FRCS (Orth), UNITED KINGDOM
Intra- and postoperative blood loss with and without use of tourniquet in knee arthroplasty. ePoster Presentation Kengo Kaji, MD, JAPAN Masaki Mori, MD, PhD, JAPAN Naoto Date, MD, JAPAN Masakazu Ishikawa, MD, PhD, JAPAN
Novel Algorithm for Gap Balancing and Bone Cuts in Robotic Total Knee Replacements Significantly Improves Accuracy and Surgical Duration ePoster Presentation Glen Liau , MBBS, MRCS, MMed, FRCS, FAMS, MBA, SINGAPORE Matthew Song Peng Ng, MBBS, SINGAPORE Ryan Wai Keong Loke, MBBS candidate, SINGAPORE
Anatomical investigation of the popliteal artery in unicompartmental knee arthroplasty cases ePoster Presentation Naoto Date, MD, JAPAN Masaki Mori, MD, PhD, JAPAN Kengo Kaji, MD, JAPAN Masakazu Ishikawa, MD, PhD, JAPAN
Changing amount of posterior tibial slope during unicompartmental knee arthroplasty does not affect short-term postoperative patients reported outcome measurement ePoster Presentation Ryo Tomita, MD, JAPAN Eiji Sasaki, MD, PhD, JAPAN Hikaru Kristi Ishibashi, MD, JAPAN Hitoshi Kudo, PhD, JAPAN Hironori Otsuka, MD, JAPAN Takahiro Tsushima, MD, PhD, JAPAN Yukiko Sakamoto, MD, PhD, JAPAN Yuka Kimura, MD, PhD, JAPAN Yasuyuki Ishibashi, MD, JAPAN
High ten years survivorship and functional results of robotic-arm-assisted lateral unicompartmental knee arthroplasty ePoster Presentation Guido Maritan, MD, ITALY Mattia Berti, MD, ITALY Federico Roman, MD, ITALY Emanuele Furlan, MD, ITALY
A Different Course Of Recovery For Extension And Flexion Strengths Following Total And Unicompartmental Knee Arthroplasty: A Prospective Cohort Study Of 369 Cases ePoster Presentation Roderick J.M. Vossen, MD, UNITED STATES Joyce L. Benner, PhD, NETHERLANDS Gaby Victoria Ten Noever De Brauw, NETHERLANDS Gino M. M. J. Kerkhoffs, MD, PhD, Prof., NETHERLANDS Andrew D. Pearle, MD, UNITED STATES Hendrik Aernout Zuiderbaan, MD PhD, NETHERLANDS Lucien C.M. Keijser, MD PhD, NETHERLANDS
Cementless Total Knee Arthroplasty is Performed in Younger Patients ePoster Presentation Logan Finger, MD, UNITED STATES Nicole Don, MA, UNITED STATES Noah Feder, BA, UNITED STATES Kenneth Urish, MD, PhD Michael O'Malley, MD, UNITED STATES Brian Klatt, MD, UNITED STATES Johannes F. Plate, MD, PhD, UNITED STATES
The Impact Of Aging On Recovery And Satisfaction In Knee Replacement Patients ePoster Presentation Tess L.Y Tsoi , MBChB, HONG KONG Harbeer Ahedi, PhD Biomedical Sciences, AUSTRALIA David A. Parker, MBBS, BMedSc, FRACS, AUSTRALIA
An Artificial Intelligence-Based Approach In Total Knee Arthroplasty ePoster Presentation Umile Giuseppe Longo, MD, MSc, PhD, Prof., ITALY Sergio De Salvatore, MD, ITALY Federica Valente, MD, ITALY Bruno Violante, MD Ph.d, ITALY Mariajose Villa Corta, MD, ITALY Kristian Samuelsson, Prof, MD, PhD, MSc, SWEDEN Giuseppe Salvatore, MD, PhD, ITALY Alessandra Berton, MD, ITALY Letizia Mancini, MD, ITALY Vincenzo Candela, MD, PhD, ITALY Arianna Carnevale, PhD, ITALY Rocco Papalia, MD, PhD, Prof., ITALY
Robotic-Assisted Total Knee Arthroplasty Achieves Superior Accuracy In Restoring Native Posterior Femoral Condylar Offset And Tibial Slope Compared To Conventional Technique ePoster Presentation Lika Dzidzishvili, MD, PhD, SPAIN Ester Garcia-Oltra, MD, PhD, SPAIN Francisco Aliaga, M.D, PhD, SPAIN Vicente López, SPAIN José Antonio Hernández-Hermoso, MD, PhD, SPAIN
Tourniquet use Does not Affect Bleeding and Surgical Time in Robotic Assisted Total Knee Arthroplasty ePoster Presentation João P.F. Guerreiro, MD, PhD, BRAZIL JOAO BALAN, MD, BRAZIL MARSAL VILHENA, MD, BRAZIL SERGIO MERÇON, MD, BRAZIL Paulo Roberto Bignardi, PhD, BRAZIL Marcus Vinicius Danieli, MD, PhD, BRAZIL
Operator variation in applying the AtMoves knee loading device for evaluation of tibial component loosening ePoster Presentation George Samuel Buijs, MD, NETHERLANDS Maaike Annemiek ter Wee, MSc, NETHERLANDS Chiel Klein, BSc, NETHERLANDS Lidwine B. Mokkink, PhD, NETHERLANDS Johannes Dobbe, PhD, NETHERLANDS Mario Maas, MD, PhD, NETHERLANDS Matthias U. Schafroth, MD, NETHERLANDS Geert Streekstra, PhD, NETHERLANDS Leendert Blankevoort, PhD, NETHERLANDS Arthur Johan Kievit, MD, NETHERLANDS
All-Intra-Incisional-Pins In Robotic Total Knee Arthroplasty (TKA) As A New Standard Of Care – A Minimally Invasive Practical Technique Guide ePoster Presentation Glen Liau , MBBS, MRCS, MMed, FRCS, FAMS, MBA, SINGAPORE Ryan Wai Keong Loke, MBBS candidate, SINGAPORE Yu Liu, MBBS, SINGAPORE
Functional Recovery in Staged Bilateral Total Knee Arthroplasty ePoster Presentation Shinichiro Nakamura, MD, PhD, JAPAN Shinichi Kuriyama, MD, PhD, JAPAN Kohei Nishitani, MD, PhD, JAPAN Yugo Morita, PhD, JAPAN Shuichi Matsuda, MD, PhD, JAPAN
Joint Line Convergence Angle After Total Knee Arthroplasty: Comparison Between Mechanical V/S Patient-Specific Alignment With Robotic Assisted Surgery: Retrospective Data Of 98 Patients ePoster Presentation David H. Figueroa, MD, CHILE Waldo Gonzalez Duque, MD, CHILE Loreto Figueroa, MD, CHILE Francisco Figueroa, MD, CHILE Rodrigo Guiloff, MD, Prof, CHILE
Double-blinded Prospective Randomized Clinical Trial in Total Knee Arthroplasty: Impact of Tourniquet Inflation Timing on Postoperative Pain, Joint Function, and Quality of Life ePoster Presentation Po-Yao Wang, MD, TAIWAN Ting-Chun Lin, TAIWAN Chia-Hui Wang, PhD, TAIWAN Jia-Lin Wu, MD, MS, TAIWAN
Evaluating The Accuracy Of Imageless Robotic Assistance In Total Knee Replacement: A Study Of Mechanical Axis Correlation With Postoperative Radiographs ePoster Presentation Rodrigo Olivieri, MD, CHILE Piero Innocenti, MD, CHILE Jaime Ignacio Ugarte Checura, MD, CHILE Jose Ignacio Laso, Md, CHILE Marco Koch, MD, CHILE Jose Tomas Muñoz, MD, CHILE Sebastian Bianchi, MD, CHILE Nicolas Gaggero, MD, CHILE
Bone Resection Planning for Medial Uka Using Stress Views is Efficient: Protocol Validation Using an Image-Based Robotic System ePoster Presentation Stefano Gaggiotti, MD, ARGENTINA Constant Foissey, MD, FRANCE Valentina Rossi, MD, ITALY Cécile Batailler, MD, PhD, FRANCE Gabriel Gaggiotti, MD, ARGENTINA Santino Gaggiotti, MD, ARGENTINA Elvire Servien, MD, PhD, Prof., FRANCE Sebastien Lustig, MD, PhD, Prof., FRANCE
The Use Of Imageless Robotic Assistance Does Not Reduce Early Postoperative Pain In Total Knee Replacement Compared To Conventional Arthroplasty ePoster Presentation Rodrigo Olivieri, MD, CHILE Sebastian Bianchi, MD, CHILE Cristóbal Díaz, MD, CHILE Pablo Albornoz, MD, CHILE Victor Barrientos, PhD, CHILE Jaime Ignacio Ugarte Checura, MD, CHILE Carolina Cardemil, MD, CHILE Pilar Buendia, BSN, CHILE Nicolas Franulic, MD, CHILE Jose Ignacio Laso, MD, CHILE Nicolas Gaggero, MD, CHILE
Is Bi-Cruciate Stabilized Total Knee Arthroplasty Better Than Conventional Knee Arthroplasty In Knee Biomechanics During Gait? ePoster Presentation Kengo Harato, MD, PhD, JAPAN Kohei Nishizawa, PhD, JAPAN Shu Kobayashi, MD, PhD, JAPAN Kazuya Kaneda, MD, PhD, JAPAN Tatsuaki Matsumoto, MD, PhD, JAPAN Takeo Nagura, MD, JAPAN
Robotic-Assisted Total Knee Arthroplasty Improves Accuracy and Reproducibility Compared to Manual Instrumentation or Navigation. ePoster Presentation Yoan Bourgeault-Gagnon, MD, FRCSC, CANADA Lucy J. Salmon, PhD, AUSTRALIA Matt Lyons, FRACS, AUSTRALIA
A Multi-Disciplinary Program For Opioid Sparse Arthroplasty Results In Reduced Long-Term Opioid Consumption: A Four Year Prospective Study ePoster Presentation Christopher J. Wilson, A/Prof, MBChB, MRCS, FRACS, PhD, AUSTRALIA D-Yin Lin, MBBS, AUSTRALIA
High Incidence Of Torsional Deformities In Knee Osteoarthritis In Asian Population ePoster Presentation Xinyu Tao, MBBS, SINGAPORE Ashton Tan, MBBS, SINGAPORE Don Koh, MBBS, BSc, MRCS, MMED, SINGAPORE Kong Hwee Lee, MBBS, FRCS (Ortho), SINGAPORE Hamid Rahmatullah Bin Abd Razak, MBBS, FRCSEd (Ortho), FRCSGlasg (Tr & Orth), FAMS, SINGAPORE Junwei Soong, MBBS, MRCS (Edin), MMED (Ortho), FRCS (Edin), SINGAPORE
Impact of Unilateral and Bilateral Total Knee Arthroplasty for Bilateral Osteoarthritis on Postoperative Fractures Risk ePoster Presentation Hiroshi Fujii, MD, PhD, JAPAN

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Changes in the Posterior Tibial Slope among Patients undergoing Medial Unicompartmental Knee Arthroplasty do not affect the Medial Proximal Tibial Angle

Changes in the Posterior Tibial Slope among Patients undergoing Medial Unicompartmental Knee Arthroplasty do not affect the Medial Proximal Tibial Angle

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Knee Arthroplasty ePosters

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Changes in the Posterior Tibial Slope among Patients undergoing Medial Unicompartmental Knee Arthroplasty do not affect the Medial Proximal Tibial Angle

Changes in the Posterior Tibial Slope among Patients undergoing Medial Unicompartmental Knee Arthroplasty do not affect the Medial Proximal Tibial Angle

Background

Purpose

Methods

Results