Summary: Patients with elevated posterior tibial slope >=12 degrees have increased knee angular velocity during a double-leg landing task when compared to patients with posterior slope < 12 degrees.

Objectives:
Increased posterior tibial slope (PTS) has been identified as a risk factor for anterior cruciate ligament (ACL) injuries and ACL reconstruction failure. The relationship between PTS and sagittal plane knee biomechanics (such as knee angular velocity) has not been evaluated. Prior work has identified that higher knee angular velocities are associated with faster peak ACL strains, which may have implications on risk of ACL graft rupture. The purpose of this study was to evaluate the relationship between PTS and sagittal plane mechanics during jump landing in a cohort of patients after ACL reconstruction. It was hypothesized that sagittal plane landing mechanics would differ between those with PTS >= 12 degrees compared to those with PTS < 12 degrees.

Methods

A cohort of patients who underwent primary, unilateral ACL reconstruction at a single institution were identified in a prospectively collected ACL database. At 2-years post-ACL reconstruction a follow-up visit was conducted to collect biomechanics data and patient reported outcome scores, including Marx Activity Score, International Knee Documentation Committee (IKDC) Score, and Knee Injury and Osteoarthritis Outcome Score (KOOS). Three-dimensional motion analysis data were collected during the initial landing phase of a bilateral drop vertical jump task. Lateral posterior tibial slope (LPTS) was measured on lateral knee radiographs of the injured knee. Biomechanical variables of interest included ground reaction forces and sagittal plane knee kinematic and kinetic variables on the reconstructed limb. Pearson correlations were calculated to evaluate the association between LPTS and biomechanical variables of interest (a=0.05). The cohort was categorized based on LPTS into low slope (PTS < 12 degrees) and high slope (PTS >= 12 degrees) groups. Demographic, outcomes, and biomechanics data were compared between the groups with independent samples t-tests (a=0.05).

Results

A total 29 patients with lateral radiographs for LPTS measurements and complete biomechanics data were included (17 females) with a mean age of 22.3 years (range 17 to 35 years). There were no significant differences in age, body mass index, Marx activity score, IKDC Score, or KOOS subscales between the high slope and low slope groups. The mean LPTS was 13.4 +/- 0.9 degrees and 8.7 +/- 1.2 degrees in the high slope and low slope groups respectively. During landing, higher involved knee angular velocity was associated with higher LPTS (r=0.43, p=0.02). Individuals with high LPTS had significantly higher involved knee angular velocity compared to patients with low LPTS.

Conclusion

At 2 years post-ACL reconstruction, there were no differences in activity or patient reported outcome scores in those with high or low LPTS. During a double-leg landing task, high LPTS is associated with higher involved knee angular velocity. Further investigation of the associations among anatomic considerations (such as PTS), knee mechanics, and ACL graft strain are needed to identify patients at higher risk of graft rupture and inform post-operative rehabilitation and discussions regarding graft failure risk.

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The Outcome Of Non-circular (Rectangle, Oval) Femoral Tunnel ACL Reconstruction, Does It Improve The Outcome Of ACL Reconstruction Surgery? Abstract Presentation 6 minutes S. Ali Ghasemi, MD, UNITED STATES Joseph McCahon, DO, UNITED STATES Arthur R Bartolozzi, MD, UNITED STATES
THE OUTCOME OF BALANCE EXERCISES AND AGILITY TRAINING FOR POST ANTERIOR CRUCIATE LIGAMENT (ACL) RECONSTRUCTION: CLINICAL ASSESSMENT Abstract Presentation 7 minutes SITI MAIZATUL AKMAL ISMAIL, Medical Science (Orthopaedic Surgery Sports), MALAYSIA
Acl - Pcl Fixation Sequence During Multi-Ligament Knee Reconstruction Does Not Affect Knee Laxity Abstract Presentation 6 minutes Carola F. van Eck, MD, PhD, FAAOS, UNITED STATES Aly Maher Fayed, MD, EGYPT Ryo Kanto, MD, JAPAN Taylor M. Price, MS, UNITED STATES Michael Dinenna, BS, UNITED STATES Monica A. Linde, MSIE, RN, UNITED STATES Patrick J. Smolinski, PhD, UNITED STATES
Analysis Of The Blood Supply To The Femoral Attachment Of The Anterior Cruciate Ligament After Acl Injury Abstract Presentation 4 minutes Jedrzej Jerzy Lesman, PhD MD, POLAND Marcin E. Domzalski, MD, Prof., POLAND Krzysztof Nowak, MD, PhD, POLAND Sebastian Zygmunt Żabierek, PhD, POLAND Radoslaw Grabowski, MD, POLAND Ilona Wagner-Olszewska, MD, POLAND
Skeletally Immature Patients with Classic Anterior Cruciate Ligament Bone Bruise Patterns Have a Higher Chance of Having an Intact Anterior Cruciate Ligament than Skeletally Mature Patients Abstract Presentation 6 minutes Aaron Baessler, MD, UNITED STATES Jessica M Buchman, MD, UNITED STATES Dexter Witte, MD, UNITED STATES Tyler Brolin, MD, UNITED STATES Thomas Ward Throckmorton, MD Frederick M. Azar, MD, UNITED STATES David Lee Bernholt, MD, UNITED STATES
Quantitative Evaluation of Lateral Articular Cartilage Quality on Magnetic Resonance Imaging at 2-years following Anterior Cruciate Ligament Reconstruction With Or Without A Lateral Extra-Articular Tenodesis Abstract Presentation 6 minutes Andrew Firth, PhD, CANADA Dianne M. Bryant, PhD, CANADA Jaques Milner , CANADA Stephany Pritchett, MD, FRCPC, DABR, CANADA David Holdsworth, PhD, Canada Stability Study Group, CANADA Alan Getgood, MD, FRCS(Tr&Orth), DipSEM, QATAR
Acl Deficiency Influences Medio-Lateral Tibial Alignment And Knee Varus–Valgus During In Vivo Activities Abstract Presentation 3 minutes Piero Agostinone, MD, ITALY Stefano Di Paolo, Eng, PhD, ITALY Alberto Grassi, PhD, ITALY Marco Bontempi, PhD, ITALY Erika Pinelli, MsC, ITALY Laura Bragonzoni, Prof., ITALY Stefano Zaffagnini, MD, Prof., ITALY
In Vivo Measurement of Anterior Cruciate Ligament Elongation and Strain Rate during Increasingly Demanding Activities ePoster Presentation Kyohei Nishida , MD, PhD, JAPAN Caiqi Xu, MD, CHINA Tom Gale, MS, UNITED STATES William Anderst, PhD, UNITED STATES Freddie H. Fu, MD, UNITED STATES
Factors associated with anterior cruciate ligament (ACL) reconstruction among ACL injuries in Alberta, Canada ePoster Presentation Yuba Raj Paudel, MPH, CANADA Mark F. Sommerfeldt, MD, CANADA Donald C. Voaklander, PhD, CANADA
Coach Education Improves Implementation Of ACL Injury Prevention Programs: A Cluster-Randomized Controlled Trial Abstract Presentation 5 minutes Daphne Ling, PhD, MPH, TAIWAN Caroline Boyle, UNITED STATES Brandon Schneider, MS, UNITED STATES Joseph Janosky, DrPHc, MS, PT, ATC, UNITED STATES James Kinderknecht, UNITED STATES Robert G. Marx, MD, UNITED STATES

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Relationship Between Posterior Tibial Slope And Sagittal Plane Mechanics During Jump Landing After Anterior Cruciate Ligament Reconstruction

Relationship Between Posterior Tibial Slope And Sagittal Plane Mechanics During Jump Landing After Anterior Cruciate Ligament Reconstruction

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Relationship Between Posterior Tibial Slope And Sagittal Plane Mechanics During Jump Landing After Anterior Cruciate Ligament Reconstruction

Relationship Between Posterior Tibial Slope And Sagittal Plane Mechanics During Jump Landing After Anterior Cruciate Ligament Reconstruction

Methods

Results

Conclusion

More ISAKOS 2021: Global Content