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Research Article
Junya Aizawa
Juntendo University
Corresponding Author
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This work is licensed under a CC BY 4.0 License. Read Full License
Background: When planning rehabilitation and conditioning for performance enhancement and a return to sports after anterior cruciate ligament reconstruction, identifying the elements of physical function associated with one-leg hop is important. The purpose of this study was to clarify the relationship between one-leg hop distances in 3 directions and knee extensor and flexor strengths at 6 months after reconstruction.
Methods: Participants were 47 patients taking part in training sessions for sports involving cutting, pivoting, and jump-landing 6 months after reconstruction using a hamstring tendon. Demographics, activity scale score, days before and after reconstruction, and meniscus surgery procedure were analyzed. One-leg hop distances in 3 directions (anterior, lateral, and medial) and isokinetic strengths of knee extension and flexion were measured. Simple regression analyses using Spearman's rank correlation coefficient were performed to assess relationships between one-leg hop distances and knee strengths.
Results: In the involved limb, correlations between one-leg hop distance in 3 directions and knee strengths were significant and effect sizes ranged from medium to large. Correlation coefficients between all one-leg hop parameters and knee extension/flexion strengths at an angular velocity of 180°/s were greater than those of 60°/s.
Conclusions: Knee strength showed moderate to high associations with lateral and medial one-leg hop distances in addition to anterior one-leg hop distance. The results of this study will be useful in planning and teaching conditioning to improve multi-directional one-legged hop skills and improve knee strength for a full-scale return to sports after reconstruction.
Keywords
single-leg side jump, hamstring, quadriceps, ACL, reconstruction
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CURRENT STATUS: Published
View the published article at BMC Sports Science, Medicine and Rehabilitation.
Version 1
Posted 25 Nov, 2020
No community comments so far
Editorial decision: Major revision
On 06 Jan, 2021
Reviews received
Received 11 Dec, 2020
Reviewers agreed
On 03 Dec, 2020
Reviewers agreed
On 29 Nov, 2020
Reviewers invited
Invitations sent on 23 Nov, 2020
Editor assigned
On 23 Nov, 2020
Editor invited
On 23 Nov, 2020
Submission checks complete
On 23 Nov, 2020
First submitted
On 19 Nov, 2020
Metrics
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HTML Views: ...
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A new preprint design is coming!
We have improved readability, clarity, accessibility, and opportunities for engagement.
See the published version of this preprint at BMC Sports Science, Medicine and Rehabilitation.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Junya Aizawa
Juntendo University
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at BMC Sports Science, Medicine and Rehabilitation.
Version 1
Posted 25 Nov, 2020
No community comments so far
Editorial decision: Major revision
On 06 Jan, 2021
Reviews received
Received 11 Dec, 2020
Reviewers agreed
On 03 Dec, 2020
Reviewers agreed
On 29 Nov, 2020
Reviewers invited
Invitations sent on 23 Nov, 2020
Editor assigned
On 23 Nov, 2020
Editor invited
On 23 Nov, 2020
Submission checks complete
On 23 Nov, 2020
First submitted
On 19 Nov, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at BMC Sports Science, Medicine and Rehabilitation.
Background: When planning rehabilitation and conditioning for performance enhancement and a return to sports after anterior cruciate ligament reconstruction, identifying the elements of physical function associated with one-leg hop is important. The purpose of this study was to clarify the relationship between one-leg hop distances in 3 directions and knee extensor and flexor strengths at 6 months after reconstruction.
Methods: Participants were 47 patients taking part in training sessions for sports involving cutting, pivoting, and jump-landing 6 months after reconstruction using a hamstring tendon. Demographics, activity scale score, days before and after reconstruction, and meniscus surgery procedure were analyzed. One-leg hop distances in 3 directions (anterior, lateral, and medial) and isokinetic strengths of knee extension and flexion were measured. Simple regression analyses using Spearman's rank correlation coefficient were performed to assess relationships between one-leg hop distances and knee strengths.
Results: In the involved limb, correlations between one-leg hop distance in 3 directions and knee strengths were significant and effect sizes ranged from medium to large. Correlation coefficients between all one-leg hop parameters and knee extension/flexion strengths at an angular velocity of 180°/s were greater than those of 60°/s.
Conclusions: Knee strength showed moderate to high associations with lateral and medial one-leg hop distances in addition to anterior one-leg hop distance. The results of this study will be useful in planning and teaching conditioning to improve multi-directional one-legged hop skills and improve knee strength for a full-scale return to sports after reconstruction.
Figure 1
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