Does knee cartilage regenerate?
In adults, joint cartilage has very little ability to repair itself. That does not mean nothing can be done: the goal is to protect what remains, control the pain and, for specific lesions, consider repair options.
Educational information prepared by Dr. Belinda Martínez, physician and surgeon. Last updated: October 3, 2026. It does not replace an assessment by a doctor.
Why does cartilage repair so poorly?
Joint (hyaline) cartilage has no blood vessels or nerves. Without blood supply, few repair cells and nutrients reach it, so an injury does not heal the way skin or bone does. If it fills in, it is usually with fibrocartilage, a different and less resistant tissue than the original.
What happens with wear and injuries?
- In osteoarthritis, the cartilage thins progressively; there is currently no treatment that fully rebuilds it.
- Some small lesions can remain stable for years without causing many symptoms.
- Focal lesions (a specific damaged area) in young people are a different case: surgical repair techniques do exist for them.
What helps protect cartilage
- Maintaining a healthy weight.
- Regular low-impact exercise and muscle strengthening.
- Treating meniscus or ligament injuries promptly.
- Avoiding repeated overload and warming up before exercise.
Options for cartilage injuries
When a focal lesion causes symptoms, the orthopedic surgeon may consider techniques such as microdrilling or microfracture (which stimulate the formation of repair tissue), cartilage and bone transplants, or implantation of the patient's own cultured chondrocytes. The choice depends on the size of the lesion, age and activity level.
Platelet-rich plasma and stem cells: what is known
Platelet-rich plasma (PRP) and hyaluronic acid are used to relieve symptoms in mild to moderate osteoarthritis. Some studies show pain improvement, but the quality of the evidence and the protocols vary, and there is no solid proof that they restore lost cartilage.
Stem cells are being studied as a possible way to regenerate cartilage, with promising early results in small studies, but there is still no conclusive evidence to recommend them widely. In Mexico, their authorized use as a therapy is limited, and it is always wise to ask about the health authorization and the evidence before accepting a treatment.
A medical assessment helps decide whether any of these options makes sense in your case and what results can realistically be expected.
When to see a doctor
Seek medical care soon if you have any of these signs:
- Pain that progressively increases or limits daily activity.
- Knee locking or a feeling that something catches.
- Frequent swelling or swelling that does not ease with rest.
Frequently asked questions
Does worn cartilage grow back?
In adults, not on its own and not completely. Wear can be slowed and symptoms controlled with the right measures, but cartilage that has been lost does not regenerate spontaneously.
Does hyaluronic acid regenerate cartilage?
There is no evidence that it does. It is used to improve lubrication and relieve pain in some cases of mild to moderate osteoarthritis, with variable results.
Do stem cells work for cartilage?
They are an active line of research, but there is still not enough evidence to recommend them routinely. It is important to check the health authorization and scientific backing of any offer.
When is someone a candidate for cartilage surgery?
When there is a symptomatic focal lesion that does not improve with conservative management. The decision depends on your age, the size of the lesion and your activity level.
Book your free assessment
Dr. Belinda Martínez reviews your case at her office in Guadalajara. The assessment is free of charge and does not commit you to any treatment.
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This content is informational and educational; it is not a diagnosis or a treatment recommendation. If you have any symptoms, consult a health professional.