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Understanding Anterior Cruciate Ligament Adaptation: Structural, Mechanical, and Healing Considerations
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DOI：10.1007/s40279-026-02498-1.png)
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Abstract
En 中文
The anterior cruciate ligament (ACL) is both a passive stabiliser and an active mechanoresponsive tissue. Emerging evidence demonstrates that its morphology, material properties, and microstructure adapt to the mechanical milieu imposed by habitual activity, targeted exercise, and surrounding musculature. This narrative review synthesises animal and human evidence on ACL mechanobiology, highlighting how loading parameters, maturational timing, and neuromuscular context shape ligament structure, function, and injury risk. At the molecular level, the ACL responds to mechanical loading through differential collagen isoform expression, matrix remodelling, and angiogenic signalling. These processes are further modulated by sex and maturation, with males typically demonstrating greater upregulation of type I collagen, whereas females synthesise comparatively less. Regional vascularity also influences adaptive capacity, potentially constraining remodelling within the mid-substance, where injury most frequently occurs. Animal ligament research shows that endurance and resistance training can increase stiffness, tensile strength, and cross-sectional area, while human studies report ligament hypertrophy in athletes who begin high-load training during adolescence. Conversely, chronic underloading leaves the ACL undersized, whereas poorly directed or chaotic overload fosters micro-damage accumulation and fatigue failure. Integrating resistance training with variable and sport-specific movement practice enhances ligament resilience and reduces initial and reinjury risk. Collectively, the ACL should be regarded as a mechanoresponsive tissue the capacity of which is determined by the interplay of morphology, vascularity, mechanotransduction, sex, maturation, and load history. An integrated load–adaptation–injury framework is proposed to guide future research and optimise clinical prevention and rehabilitation strategies.
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