Tendons, Ligaments, and Connective Tissue
Tendons and ligaments are some of the most mechanically demanding structures in the body, yet they have some of the poorest blood supply. That is not a design flaw; it reflects their function as force-transmitting structures where dense, organised collagen fibre bundles prioritise tensile strength over metabolic activity. But it means that when you strain an Achilles, partially tear a rotator cuff, or damage a ligament through excessive force, the raw materials for repair arrive slowly through limited vascular channels.
After 30, this situation compounds. Growth factor signalling that drives fibroblast activity may decline. Collagen synthesis rates slow. The extracellular matrix, the structural scaffold that organises new tissue, becomes less efficiently remodelled. Research suggests that the collagen fibres laid down during repair may be less well-organised than the original architecture, producing tissue that is mechanically inferior under load.
If you train hard, which most of our patients do, you are asking tissue that is still remodelling to tolerate forces it has not yet adapted to. The tissue cannot keep pace with the loading demands. The injury persists. You modify your training. Months pass. What started as an acute mechanical event becomes a chronic adaptation failure, where the tissue never fully reorganises to handle the forces you need it to.
The Role of Inflammation in Chronic Injuries
Acute inflammation is a necessary first phase of tissue repair. It is the body's initial mechanical response: immune cells arrive, clear damaged collagen and cellular debris, and initiate the signalling cascades that trigger new tissue formation. In a healthy system, this phase resolves within days, giving way to proliferation and remodelling.
The problem arises when inflammation becomes chronic and low-grade. Instead of resolving and allowing organised tissue repair, the inflammatory process lingers. Tissue gets caught in a cycle of partial matrix breakdown and incomplete rebuilding. Clinically, this presents as persistent tendon pain under load, recurrent joint swelling after activity, or soft tissue injuries that reach perhaps 80% of their pre-injury capacity and plateau there, never completing the final phase of structural remodelling.
Chronic low-grade inflammation does not always have a single obvious mechanical cause. Sleep quality, metabolic health, hormonal environment, stress load, and even gut health may all contribute to a systemic inflammatory state that impairs the local tissue repair process. That is why imaging alone, an MRI or ultrasound, often shows you the structural damage but tells you nothing about why the remodelling process has stalled. The mechanical picture is only one piece of a multi-factorial puzzle.