Symmetry of Single Leg Vertical Jump Height Hides Abnormal Lower Limb Biomechanics in Athletes after Anterior Cruciate Ligament Reconstruction
10.3969/j.issn.1000-6710.2023.12.003
- VernacularTitle:前交叉韧带重建术后运动员单腿垂直跳跃高度对称性掩盖其异常下肢生物力学
- Author:
Peng CHEN
1
,
2
,
3
;
Huiwu ZUO
;
Ling WANG
;
Yue DING
;
Shaohui JIA
;
Xianjuan KOU
;
Cheng ZHENG
Author Information
1. 上海体育大学运动健康学院(上海 200438)
2. 武汉体育学院运动医学院(武汉 430079)
3. 武汉体育学院国家体育总局体育工程重点实验室(武汉 430079)
- Keywords:
anterior cruciate ligament reconstruction;
single leg vertical jump;
return to sports;
bio-mechanics
- From:
Chinese Journal of Sports Medicine
2023;42(12):939-947
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore whether the single leg vertical jump height limb symmetry index(LSI)＞90%can represent the normal lower limb biomechanics in athletes after anterior cruciate liga-ment reconstruction(ACLR)during jumping.Methods Forty-six athletes after ACLR were divided into a low symmetry group(jump height LSI＜90%,n=23)and a high symmetry group(jump height LSI＞90%,n=23)according to the symmetry of single leg vertical jump height,while 24 healthy counter-part athletes were chosen into the control group.The kinematic and kinetic characteristics were com-pared among the three groups.Results(1)At the take-off stage,compared with the control group,both sides of the low-symmetry group had higher peak hip flexion angle(P＜0.05),but only the operat-ed side showed lower knee flexion moment(P=0.002),knee power(P=0.01),ankle power(P=0.045)and peak vertical ground reaction force(P=0.008).(2)At the take-off stage,there were no significant differences between the operated side of the high symmetry group and the control group in all measure-ments.However,compared with the healthy side,the operated side demonstrated lower knee flexion moment(P=0.001),knee power(P=0.002),total power of lower limb(P=0.001)and peak vertical ground reaction force(P=0.046).(3)During landing,compared with the control group,bilateral sides of the low symmetry group showed a higher peak hip flexion angle(P＜0.05)and a lower peak flexion knee angle(P＜0.05),but its operated side demonstrated lower peak ankle dorsiflexion angle(P=0.018),knee flexion moment(P=0.005),knee power(P=0.037),ankle power(P=0.002),total power of lower limb(P=0.042),and peak vertical ground reaction force(P=0.022).(4)During landing,there were no significant differences in all variables between the operated side of the high symmetry group and the control group.However,compared with its healthy side,the affected side of the high symmetry group demonstrated lower knee flexion moment(P=0.002),ankle dorsiflexion moment(P=0.003),knee power(P＜0.001),total power of lower limbs(P=0.001),and peak vertical ground reaction force(P=0.023).Conclusion Despite achieving the single leg vertical jump height LSI＞90%,athletes after ACLR still showed abnormal lower limb biomechanical characteristics during propulsion and landing.In addition,such abnormality is more obvious in athletes after ACLR with jump height LSI＜90%.Therefore,sym-metry in jump height does not represent normal lower extremity biomechanics in athletes after ACLR.
