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Recent anatomical investigations have prompted a reevaluation of medial knee structures and a refinement of their definitions. Standardized measurement techniques have been proposed to improve the reproducibility and accuracy of identifying the attachment sites of the medial collateral ligament (MCL), thereby enhancing the reliability of anatomical reference points for both surgical and diagnostic purposes.[1] The MCL, also known as the tibial collateral ligament, extends from the medial femoral epicondyle to the posteromedial crest of the tibia (see Image. Left Knee Ligaments). This structure is one of several stabilizing structures on the medial side of the knee. A broad and strong band, the MCL primarily stabilizes the knee in the coronal plane.[2][3] This complex anatomical unit plays a key role in resisting valgus stress and contributes to external rotational stability.[4][5] Increasing attention has been given to the deep part of the MCL (dMCL) for its essential role in resisting both valgus force and external tibial rotation. Concurrently, biomechanical studies have highlighted the sartorial fascia and anteromedial retinaculum (AMR) as important contributors to anteromedial stability, particularly in controlling anterior tibial translation and rotational loads.[6]