Tendon & Ligament Injury
Tendinopathy is not inflammation — and rest is not the treatment
What it is
Tendinopathy is a disorder of tendon tissue — Achilles, patellar, rotator cuff, or the common extensor tendon at the elbow ('tennis elbow'). Despite the familiar name 'tendinitis', chronic tendon pain is generally NOT an inflammatory condition: it is a failed healing response, with disorganised collagen and altered tendon structure. Ligament injuries — ankle sprains, ACL tears — are distinct, involving damage to the tissue connecting bone to bone.
Why it matters
Almost everything the public believes about tendon injury is wrong, and the wrong beliefs actively delay recovery. The name says inflammation, so people rest and take anti-inflammatories — but the tissue needs LOAD to remodel, and rest lets it deteriorate. Corticosteroid injections relieve pain in the short term and are associated with WORSE outcomes long-term. And a large industry of injections and biologics has grown up around a problem that responds, slowly and unglamorously, to progressive exercise.
What BioSignal knows about treating this
What works for Tendon & Ligament Injury
BioSignal’s clinical summary, most important first.
- PROGRESSIVE LOADING — the best-evidenced treatment. Tendon remodels in response to load, not rest
- Eccentric and heavy slow resistance protocols (well supported in Achilles and patellar tendinopathy)
- Relative rest — reducing aggravating load, not stopping altogether
- Load management and gradual return, guided by a physiotherapist
- NOT recommended: corticosteroid injection — short-term relief, worse long-term outcomes
- NOT established: platelet-rich plasma (PRP) — high-quality trials largely null
- NOT established: stem cell injections, BPC-157, TB-500 — no human outcome evidence
- Surgery for selected ligament injuries; many ACL tears do well with rehabilitation alone
Signal Records relevant to this condition
Interventions and contributing factors — some of these records describe a cause rather than a cure. The rating shown is BioSignal’s confidence in that Signal Record, not a claim about how well it treats this condition. Open any of them for the full evidence.
- CollagenModerate confidence
Real but modest evidence for skin hydration and elasticity, heavily shadowed by industry funding. Not established for joints, bone, tendon, hair or nails. It is an incomplete protein and does not build muscle. For skin, a retinoid and sunscreen have far better evidence and cost far less.
- Curcumin (Turmeric)Limited evidence
Thousands of studies, no approved drug — because curcumin is barely absorbed and a known false positive in lab assays. Modest osteoarthritis relief is its one credible claim.
- Whey ProteinHigh confidence
Works — for muscle, strength and recovery — but almost entirely by helping you hit a total daily protein target you could also hit with food. The feared harms (kidney, liver, bone) are not supported in healthy people. It is a convenience, and a good one, not a special substance.
New to this? Read these first
How this usually unfolds
- Recognize risk factors
- Get diagnosed
- Track key biomarkers
- Lifestyle first
- Evidence-based treatment
- Long-term monitoring
Who is at risk
- A sudden increase in training load — the classic trigger
- Previous tendon or ligament injury
- Older age (tendon becomes less tolerant of load)
- Obesity and metabolic dysfunction (tendons are metabolically sensitive tissue)
- Diabetes
- Fluoroquinolone antibiotics (a genuine and under-recognised tendon-rupture risk)
- Poor movement mechanics or sudden change in activity
How it's diagnosed
Tendinopathy is diagnosed clinically — localised tendon pain that is load-related, typically worse with activity that stresses the tendon, with tenderness on palpation. Imaging is often unnecessary and can mislead: tendon abnormalities are common on ultrasound and MRI in people with NO pain at all, so a scan finding does not establish the cause of symptoms. Ligament injuries are assessed by specific clinical tests, with MRI where surgical decisions depend on it.
Key biomarkers
Lifestyle
Explore this condition across BioSignal
Related Foundations
Related Signal Records
Related peptide families
Related conditions
Frequently asked questions
I have tendinitis. Shouldn't I rest it?
This is the most common and most costly mistake in tendon injury. Chronic tendon pain is generally not inflammation — the name 'tendinitis' is a misnomer, which is why clinicians now say 'tendinopathy'. It is a failed healing response, and tendon tissue remodels in response to LOAD. Complete rest lets the tendon deteriorate further and weakens the muscle around it. The treatment is progressive loading: carefully graded exercise, usually guided by a physiotherapist. It is slower and less satisfying than resting, and it works.
Should I get a steroid injection?
Generally no, and this surprises people because they often work — briefly. Corticosteroid injections do reduce tendon pain in the short term. But across multiple conditions, they are associated with WORSE outcomes at longer follow-up than exercise or even doing nothing, and repeated injections may weaken the tendon. Short-term relief is being purchased at a long-term cost, and that trade is rarely explained.
Does PRP or a stem cell injection work?
The evidence does not support them. Platelet-rich plasma has been tested in reasonable-quality randomised trials and has largely failed to outperform placebo injections for tendinopathy. Stem cell products have even less support. These are expensive, widely marketed, and not established — while progressive loading, which is cheap and well evidenced, requires patience and is therefore a harder sell.
Can peptides like BPC-157 heal my tendon faster?
There is no human outcome evidence that they do. BPC-157 and TB-500 have a substantial following in this exact situation, and their reputation rests on animal studies of tendon healing. Nothing has demonstrated benefit in humans, they are unapproved, and their purity is unverified. Meanwhile the intervention that IS proven — graded loading — is free.
Do tendon injuries heal faster with anything?
Not dramatically, and honesty matters here: tendons heal slowly because they are poorly vascularised, and recovery is usually measured in months rather than weeks. What genuinely helps is starting appropriate loading early rather than waiting, managing load rather than resting completely, and being patient with a protocol. What does not help is chasing an injection that promises to shortcut a biological timeline that does not shortcut.
Evidence summary
Progressive loading — including eccentric and heavy slow resistance protocols — has the strongest randomised evidence for tendinopathy, particularly in Achilles and patellar tendon disease. Chronic tendinopathy is predominantly degenerative rather than inflammatory, which is why the term tendinitis has been largely abandoned. Corticosteroid injections provide short-term pain relief but are associated with worse long-term outcomes across several tendinopathies. Platelet-rich plasma has largely failed to outperform placebo in higher-quality randomised trials. Imaging abnormalities are common in asymptomatic tendons. Fluoroquinolone antibiotics carry a recognised risk of tendon rupture. Many ACL tears achieve good outcomes with structured rehabilitation without early surgery.
References & sources
- Randomised trials of eccentric and heavy slow resistance loading in Achilles and patellar tendinopathy
- Systematic reviews of corticosteroid injection versus exercise for tendinopathy (long-term outcomes)
- Placebo-controlled randomised trials of platelet-rich plasma in tendinopathy
- KANON trial — rehabilitation versus early ACL reconstruction
Educational information — not medical advice
Is this condition page clear, accurate, and useful? Your feedback shapes what we review next.
Give feedback