Knee Cartilage Damage: Repair Options and Knee Cartilage Regeneration in Bangkok

What is knee cartilage damage?

The ends of the thigh bone, shin bone and the back of the kneecap are covered with smooth articular (hyaline) cartilage that lets the joint glide with very little friction. Knee cartilage damage means part of this surface has softened, fissured, torn or worn away, and because cartilage heals poorly, knee cartilage regeneration is a major focus of research. It is different from a meniscus tear, which affects the separate C-shaped cushions within the joint, though both are often called “torn cartilage”.

Common symptoms include:

• Knee pain, often with activity, stairs or squatting
• Swelling after exercise
• Catching, clicking or locking if a loose fragment is present
• Stiffness and reduced performance in sport

Small cartilage lesions may cause few symptoms. Larger or deeper ones are more likely to cause problems and, over time, can lead to knee osteoarthritis.

Causes and risk factors

• Injury: twisting injuries, dislocation of the kneecap or direct blows
• Ligament injury, particularly ACL tears, and meniscus damage
• Osteochondritis dissecans: a condition, often in younger people, where a piece of bone and cartilage loses blood supply
• Malalignment of the leg or kneecap that overloads one area
• Repetitive high-impact sport and excess body weight

Diagnosis: MRI grading of cartilage lesions

Examination checks swelling, alignment, ligament stability and tender areas, but cartilage damage cannot be confirmed by examination alone. MRI, ideally with cartilage-specific sequences, shows the size, depth and location of a defect, bone marrow changes underneath it, and associated meniscus or ligament injury. Lesions are often graded using the ICRS or Outerbridge systems, from softening (grade 1) to full-thickness loss down to bone (grade 4). Weight-bearing X-rays assess alignment and wider arthritis. Arthroscopy gives a definitive view but is invasive.

Defect size and depth, the patient’s age and the health of the rest of the knee are the key factors in choosing a treatment. You can send your knee MRI for a doctor review to understand your lesion.

Conventional knee cartilage damage treatment

• Physiotherapy and load management. Strengthening the quadriceps and hips, correcting movement patterns and adjusting sport can control symptoms for small lesions.
• Pain relief and injections. Anti-inflammatories and occasional steroid injections for flares.
• Microfracture or marrow stimulation. Small holes in the bone under the defect allow marrow cells to form fibrocartilage. Best for small defects; repair tissue is less durable than normal cartilage.
• Autologous chondrocyte implantation (ACI/MACI). Your own cartilage cells are grown in a laboratory and implanted, usually for larger defects. A matrix-based version (MACI) is approved by the US FDA for adults with cartilage defects.
• Osteochondral grafts. Plugs of bone and cartilage from your own knee or a donor.
• Realignment surgery (osteotomy) when malalignment overloads the damaged area.

Knee cartilage regeneration: what the evidence says

Cartilage regeneration is one of the main goals of orthobiologic research.

• Stem cell therapy: there are two main approaches. Surgically implanting cells into a defect (sometimes on a scaffold) has produced repair tissue in clinical studies; in South Korea, an umbilical cord blood-derived product (CARTISTEM) is approved for this use. Simple injections of mesenchymal stromal cells into the knee have shown pain and function improvements in some small trials, but consistent cartilage regrowth has not been demonstrated. See PubMed research on stem cells for knee cartilage regeneration.
• PRP therapy: may reduce pain in early cartilage wear and is used to augment cartilage surgery in some centres. It does not rebuild defects on its own. See PubMed research on PRP and cartilage repair.
• Exosome therapy: animal studies show cartilage-protective effects; human evidence is very limited.

Outside approved surgical products, cell-based cartilage treatments are not approved in the US, UK or Australia. The US FDA warns about unapproved stem cell therapies.

Comparing knee cartilage treatment options

Option	Typical defect	Evidence	Recovery	Main limitation
Physiotherapy and load management	Small, low-grade	Moderate	Weeks	Does not repair the defect
Microfracture	Small (under about 2–3 cm²)	Moderate	6–12 months	Fibrocartilage less durable
ACI / MACI	Medium to large	Good in selected patients	9–12+ months	Two-stage, costly, limited availability
Osteochondral graft	Bone and cartilage defects	Good in selected patients	6–12 months	Donor site or donor tissue issues
PRP injection	Early wear, symptom control	Mixed	Days	No proven structural repair
Stem cell injection	Early wear, diffuse damage	Early, small trials	Days to weeks	Regrowth not proven
Surgical stem cell implantation	Focal defects	Growing, mostly outside US/UK	Months	Limited availability

Self-help for knee cartilage damage

• Keep thigh and hip muscles strong; strong muscles reduce joint load
• Choose low-impact exercise such as cycling, swimming and elliptical training
• Avoid repeated deep squatting, jumping and pivoting during painful periods
• Maintain a healthy weight
• Warm up properly before sport and build training gradually

Who may be a candidate for regenerative treatment?

• Early or partial-thickness cartilage wear causing pain despite physiotherapy
• Focal defects in people who are not candidates for, or wish to discuss alternatives to, surgical repair
• Stable knee ligaments and reasonable alignment
• Understanding that injection-based regeneration is not proven

Who should not have regenerative treatment

• Large full-thickness defects with loose bodies or locking, which usually need surgery
• Significant malalignment or ligament instability that has not been corrected
• Advanced bone-on-bone arthritis
• Joint infection, active cancer, blood disorders or pregnancy

Risks and side effects

Knee injections can cause temporary pain, swelling and stiffness. Rare risks include joint infection, bleeding and allergic reactions. Harvesting fat or bone marrow adds bruising and soreness at the donor site. Surgery carries its own risks, including stiffness, clots and failure of the repair. Long-term data on injected cell therapies are limited. Cells used in our programmes are prepared in ISO 9001:2015-certified partner laboratories.

What a cartilage treatment trip to Bangkok looks like

1. Before travel: send your knee MRI and reports on WhatsApp. A doctor reviews the defect and advises whether an injection-based program is reasonable or a surgical opinion would be better.
2. Day 1: consultation, examination and imaging review.
3. Day 2 to 3: ultrasound-guided injection according to the protocol.
4. Final days: follow-up check and a rehabilitation program.

Programmes typically involve about 3 to 7 days in Bangkok, depending on the protocol. Patients travel from Australia, the UK, the US and Canada. See how it works. No outcome is guaranteed.

Recovery and aftercare at home

• Protect the knee for a few days, then return to walking gradually
• Avoid impact sport and heavy gym loading for the period advised
• Follow a staged strengthening program; muscle strength protects cartilage
• Avoid anti-inflammatory medicines for the period your doctor recommends
• Keep the medical team updated on WhatsApp and review progress after three to six months

A hot, swollen knee or fever after an injection needs urgent medical care.