How does bone healing differ from cartilage, tendon and ligament healing?
Bone healing works through the rich blood supply next to bone, while cartilage has no direct blood supply and struggles to repair itself. The book says tendons tend to heal with collagen running in all directions, and ligaments heal slowly because of limited blood flow. Regenerative care tries to support repair, and it takes time.
Key points
- Bone healing, cartilage, tendons and ligaments all repair differently. The book says regenerative medicine supports the body's own repair, but it takes time.
- Cartilage function: it is the smooth, cushiony layer where two bones meet. It soaks up shock and spreads out force.
- Cartilage in the human body has no direct blood supply, so it has a hard time repairing itself.
- Cartilage cells called chondrocytes maintain the tissue. As it wears down, they make less of the good stuff and more of the enzymes that break it down.
- Cartilage itself cannot feel pain. The pain comes from the nerve-rich bone underneath and an inflamed joint lining.
- Tendon vs ligament: tendons connect muscle to bone, ligaments connect bone to bone. Tendons tend to heal messy; ligaments heal slowly.
- The bone healing process draws on the rich blood supply around bone, and remodeling builds structural strength over months.
- Bone healing timeline after regenerative care is gradual: some people are sorer for a few days, then improve over weeks, then months as tissue remodels.
- How to heal tendons and ligaments faster? The book has no shortcut: catch problems early, support the repair and do the physical therapy.
Bones, Cartilage and Tendons
Read the full transcript · Download the MP3 · Voices are AI-generated from a script based on the book.
Cartilage function: why cartilage in the human body struggles to heal
The episode starts with cartilage, the cushion in joints such as the knee. The book explains what it does, why it wears down and why it hurts when it does.
What cartilage does
Cartilage creates the smooth surface where bones meet. It absorbs shock and spreads out the forces that run through a joint. It is made of collagen fibers, water and other building blocks.
Cartilage cells and wear and tear
Specialized cartilage cells called chondrocytes keep that mix in balance. During wear and tear, they start making fewer building blocks and more enzymes that break tissue down. The cartilage loses water, gets thinner, cracks and can eventually leave bone exposed.
Why it hurts if cartilage cannot feel pain
Cartilage has no pain receptors. The pain comes from the bone underneath, which is full of nerve endings, and from the joint lining, which gets inflamed from friction. Then muscles tighten to protect the joint, people start moving differently, and other spots take on extra stress. The book also says bone spurs can form at the joint edges.
Tendon vs ligament vs joint: what is the difference?
Tendons connect muscle to bone, and ligaments connect bone to bone. A joint is where two bones meet, cushioned by cartilage, held together by ligaments and moved by tendons. According to the book Beyond Stem Cells, tendons tend to heal in a messy, disorganized way, while ligaments heal slowly because they have little blood supply.
Tendons connect muscle to bone
Tendons have to handle big forces every time you move. When they get hurt, the book says they tend to heal in a disorganized way, with collagen running in all directions, like a badly packed suitcase. That makes the tendon weaker and it can keep hurting.
Ligaments connect bone to bone
Ligaments are tough bands that keep a joint stable. They heal slowly for a different reason: they do not have much blood supply.
The joint is where it all meets
A joint is where two bones meet, cushioned by cartilage and held together by ligaments, with tendons moving it. A problem in one part often puts stress on the others.
The bone healing process and how regenerative care fits in
The bone healing process works through the rich blood supply that sits next to bone. According to the book Beyond Stem Cells, that is a key difference from cartilage, which has no direct blood supply. Over the following months, remodeling builds structural strength. Regenerative care tries to support that repair instead of only treating symptoms.
What the usual tools do
The book says the usual tools are anti-inflammatory medicines, steroid shots and surgery, and those mostly go after symptoms. Regenerative medicine tries to support the body's own repair instead.
Bone healing and blood supply
Unlike cartilage, bone sits next to a rich blood supply. The book says bone healing usually works through that blood supply, and that concentrated growth factors may help restart healing that has stalled. Over the following months, remodeling builds better structural strength.
Mesenchymal stem cells: it is the signals
Mesenchymal stem cells used in care come from donated umbilical cord tissue. The book says the big thing is not them turning into new tissue. It is the signals they send, which may help calm inflammation and move the area from the inflamed stage into repair mode.
PRP from your own blood
PRP comes from a small blood draw that is spun down so platelets are several times more concentrated than normal. Platelets carry growth factors. The book says PRP and stem cells can be combined.
Precise delivery with ultrasound
The book says precise delivery is critical. Ultrasound shows the tendons and the needle live on a screen, which especially helps with the rotator cuff, the Achilles tendon and the bottom of the foot. Episode 4 covers the rotator cuff.
Bone healing timeline, surgery and rehab
The book describes a gradual timeline. Some people are sorer for a few days at first, which the book says is the body reacting, not a sign it failed. Improvement builds over weeks and continues over months as tissue remodels. Physical therapy is part of the plan, and regenerative care is not a skip-the-work option.
- Surgery or not: a complete tendon or ligament tear, or a badly collapsed joint, usually needs surgery. For early or moderate problems, it may help some people put off surgery, and it is sometimes used alongside surgery.
- Timeline: some people are sorer for a few days at first. The book says that is the body reacting, not a sign it failed. Improvement is gradual over weeks, then continues over months as tissue remodels.
- Rehab: physical therapy is essential. Protect the area first, then build strength, then balance, then real-life movements.
- Maintenance: for some wear-and-tear conditions, the book mentions maintenance treatments every so often.
- What can slow results: age, diabetes and how long the problem has been there.
These ideas go alongside your own provider's care, not instead of it.
Chapter 12 in one line
Catch joint problems early, support the repair, and put in the rehab work.
Episode 12 transcript.
Read along, or skim the parts you care about most.
EliseOkay so, chapter twelve. And this one's about bones and joints?
GuideYep. Orthopedics. Bones, joints, cartilage, tendons, ligaments.
EliseSo basically everything that hurts when I get out of bed.
GuidePretty much, yeah.
EliseOkay, so what's the usual approach?
GuideSo the book says the usual stuff is anti-inflammatory meds, steroid shots, and surgery. And those mostly go after the symptoms.
EliseMm-hm.
GuideRegenerative medicine tries to support the body's own repair instead. The catch is, it takes time.
EliseOkay. Let's start with cartilage, 'cause I feel like everybody's knees are going.
GuideRight. So cartilage is the smooth, cushiony layer where two bones meet. It soaks up the shock.
EliseLike the padding.
GuideExactly like padding. But here's the thing. Cartilage has no direct blood supply.
EliseWait, none?
GuideNone. So it has a really hard time repairing itself.
EliseHuh. So what happens when it wears down?
GuideThe cells that maintain it start making less of the good stuff and more of the enzymes that break it down. So it gets thinner, it cracks, and eventually bone can end up exposed.
EliseOuch.
GuideAnd fun fact, cartilage itself can't feel pain.
EliseThen why does it hurt?
GuideBecause the bone underneath is full of nerve endings. And the joint lining gets inflamed from all the friction.
EliseOh, that makes sense.
GuideAnd then your muscles tighten up to protect it, you start walking funny, and that puts stress on other spots.
EliseSo it kind of snowballs.
GuideTotally snowballs.
EliseOkay, so what about tendons and ligaments?
GuideSo tendons connect muscle to bone. Ligaments connect bone to bone.
EliseI always mix those up.
GuideEverybody does. And when tendons get hurt, the book says they tend to heal kind of messy. The collagen goes in all directions.
EliseLike a badly packed suitcase.
GuideYes! And that makes it weaker and it can keep hurting. Ligaments are slow for a different reason. Not much blood supply.
EliseOkay. So where do stem cells fit?
GuideSo, mesenchymal stem cells, from donated umbilical cord tissue. And the book says the big thing isn't really them turning into new tissue.
EliseLet me guess. It's the signals?
GuideIt's always the signals! They send out messages that may help calm inflammation and push the area from, like, the inflamed stage into repair mode.
EliseAnd PRP?
GuidePRP comes from your own blood. They draw a little, spin it down, and you get platelets at levels several times higher than normal.
EliseAnd platelets carry the growth factors.
GuideYou've been paying attention.
EliseI have!
GuideThe book also says PRP and stem cells can be combined.
EliseHow do they know they're putting it in the right spot, though?
GuideGreat question. The book says precise delivery is critical. A lot of the time they use ultrasound, which shows the tendons and the needle live on a screen.
EliseOh, like a GPS.
GuideKinda, yeah. Rotator cuff, Achilles tendon, the bottom of the foot, that's where it really helps.
EliseSo, is this instead of surgery?
GuideSometimes, sometimes not. If a tendon or ligament is completely torn, or the joint is really collapsed, the book says surgery is usually the answer.
EliseOkay.
GuideBut for early or moderate problems, it may help some people put off surgery. And sometimes it's used alongside surgery, to support healing.
EliseHow fast does it work?
GuideNot fast. Some people are actually sorer for a few days at first.
EliseWait, sorer?
GuideYeah, the book says that's the body reacting, not a sign it failed. Then it's gradual. A few weeks, then more over months as the tissue remodels.
EliseSo, patience.
GuidePatience. And rehab. The book is really firm that physical therapy is essential.
EliseNot just, get the shot and go home.
GuideNo. You protect it first, then build strength, then balance, then real-life movements. Step by step.
EliseAnd is it one and done?
GuideNot always. For some wear-and-tear conditions, the book mentions maintenance treatments every so often.
EliseAnything that makes it work less well?
GuideAge can matter. Diabetes. How long the problem's been there. And honestly, insurance often doesn't cover much of it.
EliseGood to know. So sum up chapter twelve?
GuideCatch joint problems early, support the repair, and put in the rehab work.
EliseI like that. And, quick reminder, this is general info, not medical advice. Talk to your own provider.
GuideAlways.
This is general information, not medical advice. Talk to your own provider.
Frequently asked questions.
What is the function of cartilage?
Cartilage is the smooth, cushiony layer where two bones meet. It absorbs shock and spreads out force across the joint. Because it has no direct blood supply, it has a hard time repairing itself.
What are cartilage cells?
Cartilage cells, called chondrocytes, keep the mix of collagen, water and other building blocks in balance. According to the book, during wear and tear they make fewer building blocks and more enzymes that break tissue down, so the cartilage gets thinner.
What is the difference between a tendon and a ligament?
Tendons connect muscle to bone. Ligaments connect bone to bone. According to the book, tendons tend to heal messy, with collagen in all directions, while ligaments heal slowly because they have little blood supply.
What is the bone healing timeline after regenerative treatment?
The book describes it as gradual. Some people are sorer for a few days at first, then improve over a few weeks, with more change over months as the tissue remodels. Physical therapy is part of the plan.
Is there a way to heal tendons and ligaments faster?
The book does not offer a shortcut. It says to catch problems early, support the body's repair and follow a step-by-step rehab plan: protect, strengthen, balance, then real-life movement.
Can stem cells or PRP replace surgery?
Sometimes, sometimes not. The book says a complete tear or a badly collapsed joint usually needs surgery. For early or moderate problems, regenerative care may help some people put off surgery, and it can be used alongside surgery.
Where is Beyond Stem Cells located?
Beyond Stem Cells is at 5912 S Cody St, Suite 201, Littleton, CO 80123, serving the Denver metro. This podcast is general education, not medical advice.
Want to see how this connects to care in the Denver metro? Learn about joint regeneration, knee pain treatment in Littleton, shoulder and rotator cuff care, stem cell therapy vs surgery, knee osteoarthritis in Episode 6, the rotator cuff in Episode 4, elbow tendon tears in Episode 2, mesenchymal stem cells, shockwave therapy for plantar fasciitis, hip pain treatment in Littleton, hand and wrist care, our medical team.
Further reading: MedlinePlus (National Library of Medicine): cartilage disorders.
Want the whole book? Get the free Beyond Stem Cells book.
Regenerative care in Littleton and the Denver metro.
Beyond Stem Cells sits just off S Cody St in Littleton, an easy drive from Ken Caryl, Highlands Ranch, Centennial, Englewood and Lakewood.
Questions about your own situation?
The podcast is general education. If you want to talk about your own health, request a consultation with our team.
Beyond Stem Cells · 5912 S Cody St, Suite 201, Littleton, CO 80123 · (833) 720-7836 · info@beyondstemcells.com
Medical disclaimer: This page is general education based on the book Beyond Stem Cells by John Comandari and Neville Campbell, MD. It is not medical advice. Individual results vary and no specific outcome is promised. Talk to your own provider about your situation.