S. Ren (Beijing, CN)

Peking University Third Hospital
My research focus on the biomechanical properties of joint; including three dimensional kinematics; kinetics by gait analysis and inverse dynamics and stress distribution in the joint by finite element analysis; to explore the biomecanical mechanism for secondary injury after ACL injury; to provide clinical advices for rehabilitation and treatments.

Presenter Of 1 Presentation

 ICRS 2022 - Online Programme
Poster Biomechanics

P252 - ACL-deficient Patients with and without Medial Meniscus Posterior Horn Tear Presented Different Dynamic BLDs of Walking Biomechanics

Presentation Topic
Biomechanics
Date
13.04.2022
Lecture Time
09:30 - 09:30
Room
Exhibition Foyer
Session Name
7.3 - Poster Viewing / Coffee Break / Exhibition
Session Type
Poster Session
Speaker
Authors
Disclosure
Supported by the National Natural Science Foundation of China (31900943, 31900961), Education and Teaching Research of Peking University Health Science Foundation of China (2020YB44), and Beijing Natural Science Foundation of China (7202232),Peking Univer

Abstract

Purpose

The purpose of this case-control study was to investigate the knee kinematics and kinetic asymmetries in ACLD patients with and without MMPHT (ACLD+MMPHT, ACLD) during level walking.

Methods and Materials

15 patients with isolated unilateral ACLD, ten with unilateral ACLD+MMPHT, and 22 healthy controls underwent gait testing between January 2014 and December 2016. Between-leg differences (BLDs) in knee kinematics and kinetics were compared among the subjects in the control, ACLD, and ACLD+MMPHT groups.

Results

The ACLD + MMPHT group demonstrated significantly higher BLD in knee moments during loading response phase than the ACLD and control groups. Compared to healthy controls, the ACLD and ACLD + MMPHT groups demonstrated significantly higher BLD in knee angles in the sagittal plane during mid and terminal stance phases. Compared to healthy controls, significantly higher BLD in knee rotation moments were found throughout the stance phase in both ACLD and ACLD + MMPHT groups. BLD of the lateral ground reaction force (GRF) in the ACLD+MMPHT and ACLD groups were both significantly higher than the control group during the loading response phase. BLD of the anterior GRF in the ACLD+MMPHT and ACLD groups were both significantly higher than the control group during the loading response phase. Only the ACLD + MMPHT group demonstrated higher BLD of the vertical GRF than the control group during the loading response phase, while no significant differences were observed between the ACLD and control groups.

Conclusion

The ACLD+MMPHT group demonstrated significantly more knee flexion moments asymmetries than the ACLD and control groups during the loading response phase. Both the ACLD+MMPHT and ACLD groups demonstrated significant knee angles and moments asymmetries in the sagittal plane during terminal stance phase than healthy control group. Both the ACLD+MMPHT and ACLD groups demonstrated knee moments asymmetries in the axial plane during mid and terminal stance phases than healthy control group.

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Presenter Of 1 Presentation

 ICRS 2022 - Poster Presentations
Biomechanics

P252 - ACL-deficient Patients with and without Medial Meniscus Posterior Horn Tear Presented Different Dynamic BLDs of Walking Biomechanics

Speaker

Abstract

Purpose

The purpose of this case-control study was to investigate the knee kinematics and kinetic asymmetries in ACLD patients with and without MMPHT (ACLD+MMPHT, ACLD) during level walking.

Methods and Materials

15 patients with isolated unilateral ACLD, ten with unilateral ACLD+MMPHT, and 22 healthy controls underwent gait testing between January 2014 and December 2016. Between-leg differences (BLDs) in knee kinematics and kinetics were compared among the subjects in the control, ACLD, and ACLD+MMPHT groups.

Results

The ACLD + MMPHT group demonstrated significantly higher BLD in knee moments during loading response phase than the ACLD and control groups. Compared to healthy controls, the ACLD and ACLD + MMPHT groups demonstrated significantly higher BLD in knee angles in the sagittal plane during mid and terminal stance phases. Compared to healthy controls, significantly higher BLD in knee rotation moments were found throughout the stance phase in both ACLD and ACLD + MMPHT groups. BLD of the lateral ground reaction force (GRF) in the ACLD+MMPHT and ACLD groups were both significantly higher than the control group during the loading response phase. BLD of the anterior GRF in the ACLD+MMPHT and ACLD groups were both significantly higher than the control group during the loading response phase. Only the ACLD + MMPHT group demonstrated higher BLD of the vertical GRF than the control group during the loading response phase, while no significant differences were observed between the ACLD and control groups.

Conclusion

The ACLD+MMPHT group demonstrated significantly more knee flexion moments asymmetries than the ACLD and control groups during the loading response phase. Both the ACLD+MMPHT and ACLD groups demonstrated significant knee angles and moments asymmetries in the sagittal plane during terminal stance phase than healthy control group. Both the ACLD+MMPHT and ACLD groups demonstrated knee moments asymmetries in the axial plane during mid and terminal stance phases than healthy control group.

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