Effects of knee extension constraint training on knee biomechanics and bilateral symmetry during running after ACL reconstruction
10.3969/j.issn.1000-6710.2025.02.002
- VernacularTitle:伸膝阻尼训练对前交叉韧带重建术后跑步膝关节生物力学特征及双侧对称性的影响
- Author:
Shengxing FU
1
;
Huijuan SHI
;
Yuanyuan YU
;
Mujia MA
;
Yulin ZHOU
;
Hongshi HUANG
;
Yingfang AO
;
Hui LIU
Author Information
1. 北京体育大学运动人体科学学院,运动康复科学教育部重点实验室(北京 100084)
- Publication Type:Journal Article
- Keywords:
ACL reconstruction;
knee extension constraint brace;
abnormal biomechanics
- From:
Chinese Journal of Sports Medicine
2025;44(2):95-102
- CountryChina
- Language:Chinese
-
Abstract:
Objective To determine the effect of knee extension constraint training on bilateral knee biomechanics and bilateral symmetry in running after anterior cruciate ligament reconstruction(ACLR).Methods A total of 33 male patients with unilateral ACL injuries were randomly assigned to a BRACE group of 14 wearing a brace with limitation of knee extension,a PLACEBO group of 10 wear-ing a brace without limitation of knee extension,and a CONTROL group of 9,wearing no brace.All groups underwent unilateral hamstring-auto graft ACLR surgery,immediately followed by 12-week rou-tine rehabilitation.Between week 13 and 48,both the BRACE and PLACEBO groups wore braces for one hour on Mondays.Then,running biomechanical tests were performed at the ends of Week 12 and Week 48,and the bilateral knee extension/flexion angle,moment and inter-leg difference(ILD)were calculated.One-dimensional statistical parametric mapping(SPM1d)two-way ANOVA with repeated measures on one factor was used to identify differences in bilateral knee biomechanics and ILD among the three groups before and after the intervention.Results There was no significant interaction effect of group and time on bilateral knee flexion angle,knee extension moment,and ILD in running(P>0.05).Moreover,no significant effect of group was found on the bilateral knee biomechanics and ILD in running(P>0.05).Additionally,significant effects of time were observed on bilateral knee flexion angle and extension moment in running.However,bilateral knee flexion angle decreased during termi-nal stance(ACLR leg:89%～100%,P=0.036;non-ACLR leg:94%～100%,P=0.046),while the bi-lateral knee extension moment increased during mid-stance(ACLR leg:17%～59%,P<0.001;non-ACLR leg:38%～61%,P<0.001)between week 12 and 48.Conclusion In this study,no improvement was found in the abnormal knee biomechanics and symmetry during running in male patients after uni-lateral ACL reconstruction through long-term knee extension constraint training.Moreover,within one year after ACL reconstruction,the knee extension moment of the surgical limb increased gradually over time,with no changes in the knee flexion angle of the surgical limb and bilateral knee symme-try,suggesting that abnormal knee biomechanics and bilateral symmetry should be paid attention to in the post-surgery rehabilitation.
