Abstract Purpose In modern anterior cruciate ligament (ACL) surgery, the focus is usually on anatomical reconstruction to restore the natural kinematics of the knee. The individual optimal positioning of the ACL footprints (FPs) in primary surgery is still controversial and, especially in revision surgery, difficult to realize surgically. In this regard, a new MRI‐based sequence, the Compressed Lateral and anteroposterior Anatomic Systematic Sequence (CLASS) with marked femoral and tibial FPs as a template, could help. The purpose of this study was to (1) validate the reliability and reproducibility of the localization of femoral and tibial FPs of ACL in the generation of CLASS and (2) compare the identification of ACL FPs by CLASS with previously described methods. Methods Magnetic resonance imaging (MRI) of uninjured knees from a predominantly young cohort is used to apply the CLASS algorithm. ACL FPs were subsequently identified by a board‐certified radiologist and an orthopaedic knee surgeon. Intraobserver reliability and interobserver reproducibility were assessed. Measurements of the ACL FPs according to established methods were performed and compared with the results from the literature. Results Identification of ACL FPs and generation of CLASS images resulted in ‘almost perfect’ reliability and reproducibility. Most measurements also showed ‘almost perfect’ consistency. Statistical analysis showed significant variations between the deep‐shallow and high‐low positions when compared to the published literature. Conclusions The CLASS MRI sequence is a reliable and reproducible method for identifying ACL FPs. The observed variability in the location of the ACL FP underlines the importance of a patient‐specific surgical approach. Level of Evidence Level II.

Grégoire Thürig

Marc Barrera Usó

Raúl Panadero‐Morales

Julien Galley

Joseph Schwab

Alexander Heimann

Moritz Tannast

Daniel Petek

Knee Surgery Sports Traumatology Arthroscopy

在过去的 10 年中，很少有其他骨科手术和创伤学领域像膝关节手术、关节镜检查和运动创伤学那样经历了如此巨大的发展。在 ORTHOPEDICS 和 SPORTS SCIENCES 的期刊中排名前 33%，这本欧洲期刊的目标是发表关于创新膝关节手术、运动创伤手术和关节镜检查的论文。每期都有一系列同行评议的文章，涉及诊断和管理以及基础研究。每期还包含至少一篇关于重要临床问题的评论文章。也接受有关技术创新的案例介绍或简短说明。文章涵盖膝关节手术的各个方面和所有类型的运动创伤；此外，还涉及流行病学、诊断、治疗和预防以及所有类型的关节镜检查（不仅是膝盖，还包括肩部、肘部、腕部、臀部、脚踝等）。包括有关新诊断技术（如 MRI 和超声）的文章以及有关关节、肌肉和肌腱的生物力学的高质量文章。尽管这主要是一本临床期刊，但它也对具有临床相关性的基础研究开放。由于该期刊得到了杰出的欧洲编辑委员会的支持，并得到了国际顾问委员会的协助，因此您可以放心，该期刊保持着最高标准。欧洲运动创伤学、膝关节外科和关节镜学会 (ESSKA) 的官方临床杂志。

Over the past decade, there has been significant development in the fields of knee surgery, arthroscopy, and sports traumatology. This European journal, titled 'Knee Surgery, Sports Traumatology, Arthroscopy', ranks in the top 33% of journals in orthopedics and sports sciences. The journal aims to publish research papers on innovative knee surgeries, sports trauma surgeries, and arthroscopic techniques. Each issue features a series of peer-reviewed articles covering diagnosis, management, and fundamental research. Additionally, there is at least one review article addressing important clinical issues in each issue. We also welcome case reports or brief descriptions regarding technological innovations. The articles encompass all aspects of knee surgery and various types of sports injuries, including epidemiology, diagnosis, treatment, prevention, and all forms of arthroscopy (not limited to the knee, but also including the shoulder, elbow, wrist, hip, and ankle). The journal publishes high-quality articles on new diagnostic techniques such as MRI and ultrasound, as well as on the biomechanics of joints, muscles, and tendons. While primarily a clinical journal, it is also open to fundamental research with clinical relevance. Supported by an outstanding European editorial board and an international advisory committee, the journal maintains the highest academic standards.

在过去的十年中，膝关节手术、关节镜检查和运动创伤学领域经历了显著的发展。这本名为《Knee Surgery, Sports Traumatology, Arthroscopy》的欧洲期刊在骨科和运动科学领域排名前33%。期刊旨在发表关于创新膝关节手术、运动创伤手术和关节镜检查的研究论文。每期包含一系列经过同行评审的文章，涉及诊断、管理及基础研究。此外，每期还会有至少一篇关于重要临床问题的评论文章。我们也欢迎关于技术创新的案例介绍或简短说明。文章内容涵盖膝关节手术的各个方面及各种运动创伤，包括流行病学、诊断、治疗和预防，以及所有类型的关节镜检查（不仅限于膝关节，还包括肩部、肘部、腕部、臀部和脚踝等）。期刊还会发表关于新诊断技术（如MRI和超声）以及关节、肌肉和肌腱生物力学的高质量文章。尽管本期刊主要聚焦于临床研究，但也欢迎具有临床相关性的基础研究。得益于杰出的欧洲编辑委员会和国际顾问委员会的支持，期刊始终保持着最高的学术标准。

Category	Quartile
医学	2
医学, 骨科	2
医学, 运动科学	2
医学, 外科	2

Validation of CLASS MRI for personalized ACL footprints identification

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