## 4 Discussion
### Clinical Implications  
The SLVHT is a functional, sensitive and safe test that can easily assess rehabilitation progress in terms of lower limb strength. As the jump height measurement on the SLVHT have a strong correlation with isokinetic testing and various other hop tests [41], it can be used as a safe, low-cost and time-efficient alternative to traditional non-performance-based criteria such as the time to surgery and PROMS, even in patients after meniscal injury. Digital technology that offers pseudonymised data collection from various other tests may allow us to create a large-scale rehabilitation registry that could help surgeons and trainers to better evaluate various aspects of surgical techniques or rehabilitation protocols. Finally, patients must be counselled preoperatively that rehabilitation may take up to 12 months, and functional testing should be performed routinely to monitor their longitudinal progress.  
The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app14083143/s1](https://www.mdpi.com/article/10.3390/app14083143/s1)]([https://www.mdpi.com/article/10.3390/app14083143/s1](https://www.mdpi.com/article/10.3390/app14083143/s1)), Table S1: Univariate correlations between jump heights during single-leg vertical hop test (SLVHT) at 6 months post-operatively and different parameters; Table S2; Multivariate linear regression analysis for the jump height with the injured leg during single-leg vertical hop test (SLVHT) 6 months postoperatively; Table S3: Stepwise multivariate linear regression analysis for the jump height with the healthy leg during single-leg vertical hop test (SLVHT); Figure S1: Univariate correlations between jump heights during single-leg vertical hop test (SLVHT) at 6 months post-operatively and (A) Jump Height with the healthy leg; (B) Limb Symmetry Index (LSI).  
**Author Contributions:** [PERSON] and [PERSON] conceptualised and designed the study. N.S., U.A. and H.S. made substantial contributions to data acquisition. [PERSON] and [PERSON] contributed to patient counselling after functional testing. N.S., U.A., H.S. and A.D. assisted in data analysis, reviewed the current literature and contributed to the discussion of results. [PERSON], [PERSON], [PERSON], [PERSON] and [PERSON] made substantial contributions in data analysis, the interpretation of results, writing the manuscript and revising it critically. All authors approved the final manuscript. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research received no external funding.  
**Institutional Review Board Statement:** Ethical approval for this study was given by a local research ethics committee (University of Witten-Herdecke, Chart# 56/2022, date of approval: 11 April 2022). This study was conducted in accordance with the Declaration of Helsinki.  
**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study; parental or guardian consent was obtained for minors.  
**Data Availability Statement:** The data are available from the corresponding author on reasonable request.  
**Acknowledgments:** We would like to thank all patients for participating in this study.  
**Conflicts of Interest:** [PERSON] is a medical consultant at OPED GmbH. [PERSON] is a working student at OPED GmbH. Authors [PERSON], [PERSON], [PERSON], [PERSON], [PERSON] and [PERSON] were employed by the company Sportsclinic Cologne. Authors [PERSON] and [PERSON] were employed by the company MEDIACC (Medico-Academic Consultings). Author [PERSON] was employed by the company OrthoPrax. The remaining author declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.