What are the stages of tendon healing?

Stages one and two: the inflammatory days and the proliferative weeks

What are the stages of tendon healing is a question with a textbook answer of three stages, and the honest page gives the three with their jobs and their lengths and then adds what the textbook leaves out, which is what a lifter can and cannot do in each and why the third stage is the one lifters get wrong. Stage one is the inflammatory stage, the first days after a tendon is torn, partially or completely, or surgically repaired. The torn ends bleed and the blood clots, forming the scaffold on which the repair will be built; inflammatory cells arrive, clear the damaged tissue and release the signals that summon the fibroblasts of the next stage; the area swells and hurts, which is protective, and the tendon at this point has no mechanical strength of its own beyond what the clot and any suture provide. What the lifter does in stage one is protect: a ruptured Achilles goes into a boot with the foot pointed down, a repaired tendon is protected as the surgeon directs, a partially torn tendon is rested from the movement that tore it, and movement within the limits set is encouraged while any attempt to load through the tear is not, since a tear reopened in stage one restarts the clock. Stage two is the proliferative stage, the following weeks. Fibroblasts multiply in the wound and lay down new collagen at a high rate, but it is the wrong kind and the wrong shape, mostly type III collagen, finer and weaker than the type I a mature tendon is made of, arranged randomly rather than in parallel, with high cellularity and high water content, so the repair is bulky, a palpable lump in a healing Achilles, and weak, and the tendon healing literature's central finding for this stage is that controlled early loading produces a better-organised and stronger repair than immobilisation, because fibroblasts align the collagen they make to the tension they feel. What the lifter does in stage two is begin to load, gently and progressively and under guidance, the boot's wedges coming out over weeks in a rupture, range and isometric work starting in a partial tear, always within the limits the tissue's weakness sets, since stage two collagen tears easily and a lifter who tests it has produced a stage-one wound inside a stage-two repair.

Stage three, the rupture timeline, tendinopathy as healing that stalled, and the adjunct

Stage three is the remodelling stage and it is the one lifters cut short, because it runs for months to over a year and it is largely silent. Type I collagen replaces the type III laid down in stage two, the fibres align progressively to the loads placed on them, cellularity and water content fall toward normal, cross-links mature, and the tendon stiffens and strengthens toward, without fully regaining, its original mechanical properties, the healed tendon remaining somewhat weaker and thicker than the uninjured one for a long time. The pain stops early in stage three, often months before the tissue has remodelled, and a lifter who returns to full loading when the pain stops is loading a scar that looks and feels healed and is not, which is the mechanism of re-rupture and re-injury, so what the lifter does in stage three is progress the loading toward the sport's demands under a programme and return by tests, strength symmetry, capacity, sport-specific movement, rather than by the calendar or the pain, the return-to-sport literature's finding that criteria-based return re-injures less. The rupture timeline puts numbers on the stages for the worst case, an Achilles rupture whether repaired surgically or rehabilitated non-operatively in a boot: weeks in the boot through stages one and two, months to walk normally and then to run as stage three begins, and around a year for strength and calf size to approach the other side, with the two management routes producing similar function and different risks, decided with a specialist. Chronic tendinopathy, the lifter's usual tendon problem, is different in kind and worth separating: it is not a tendon moving through the stages but a healing response that stalled, the biopsies showing a stage-two picture that never progressed, disorganised collagen, high cellularity, water and new vessels and nerves, which is why rest does little and progressive loading, which gives the fibroblasts the tension to align to, is the treatment that restarts the remodelling the tissue failed to finish on its own. Collagen's place across the stages is the pre-loading protocol, around fifteen grams with roughly 50mg of vitamin C an hour before the loading session, which doubled a collagen synthesis marker in a small trial and is used by some physiotherapists as an adjunct in stages two and three, when fibroblasts are making collagen and the loading is telling them where, a marker result with one small clinical trial in tendinopathy behind it and no claim, useless in stage one when there is no loading to time it to and useless at any stage without the programme. The worked example is that adjunct on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, below the protocol's grams, taken for vitamin C's collagen formation sentence through the months the stages take. What are the stages of tendon healing: days of protection, weeks of gentle loading, and a year of remodelling that the pain stops announcing long before it is done.

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