Knee Cartilage Regeneration Treatment in Singapore: A Comprehensive Guide

Microfracture is a routine cartilage repair procedure. During this arthroscopic (keyhole) surgery, the surgeon creates small holes in the exposed bone beneath the cartilage defect, stimulating bleeding and allowing bone marrow cells to migrate into the damaged area, forming a clot that eventually develops into fibrocartilage—a repair tissue that provides functional coverage.

This technique works well for smaller defects in patients with otherwise healthy knees. The procedure is relatively straightforward with a shorter operative time. The resulting fibrocartilage is not identical to native hyaline cartilage (the smooth, durable cartilage that naturally covers joint surfaces) and may be less durable for high-demand activities.

ACI is a two-stage procedure for larger cartilage defects. In the first stage, healthy cartilage cells (chondrocytes) are harvested from a non-weight-bearing area of your knee through arthroscopy (a minimally invasive procedure using a small camera). These cells are then cultured in a laboratory over several weeks to multiply their numbers.

In the second stage, the expanded cells are implanted into the defect site, either under a patch of tissue or within a collagen membrane (matrix-assisted ACI or MACI). This technique can produce hyaline-like cartilage and is suitable for larger defects. The two-surgery requirement and longer overall timeline are considerations for patients.

This technique involves transplanting plugs of healthy cartilage and underlying bone from a non-weight-bearing area of your knee to the damaged site. Multiple plugs may be used in a “mosaic” pattern for larger defects.

OATS can be effective for small to medium defects and provides immediate structural cartilage replacement. Donor site availability limits the treatable defect size, and some patients experience discomfort at the harvest site.

For larger defects or when donor tissue from the patient’s own knee is insufficient, fresh cartilage and bone from a tissue donor (allograft) may be used. This technique can address substantial defects and provide mature, functional cartilage immediately.

The procedure requires careful tissue matching and relies on tissue bank availability. Fresh allografts (donated tissue from another person) maintain better cell viability than frozen tissue.

Cartilage regeneration procedures utilise modern technologies, including:

• High-definition arthroscopic systems for visualisation
• Specialised instruments for precise tissue preparation
• Validated cell culture techniques for ACI procedures

Some centres employ biological scaffolds (supportive structures that help new tissue grow) and growth factors (natural proteins that stimulate healing) to support tissue regeneration.

The initial post-operative period focuses on pain management and protecting the surgical site. Key considerations include:

• Pain control: Take prescribed medications as directed. Don’t wait for severe pain to take medication.
• RICE protocol: Rest, Ice (on and off intervals), Compression, Elevation above heart level.
• Wound monitoring: Keep dressings clean and dry. Watch for signs of infection, such as increasing redness, warmth, discharge, or fever.
• Movement: Perform gentle ankle pumps and quadriceps contractions (tightening your thigh muscles) as instructed to help maintain circulation.
• Weight-bearing: Follow your surgeon’s specific instructions. Many procedures require non-weight-bearing or toe-touch weight-bearing initially.

Contact your surgeon if you experience severe pain uncontrolled by medication, significant swelling, numbness, fever, or any concerning symptoms.

During this phase, your focus remains on protecting the healing cartilage whilst preventing joint stiffness:

• Attend your first post-operative appointment, typically within the first week after surgery.
• Begin gentle range-of-motion exercises (movements that help maintain your knee’s flexibility) as prescribed.
• Continue using crutches and following weight-bearing restrictions.
• Gradually reduce pain medication as comfort improves.
• Keep the surgical site clean. Your surgeon will advise when you can shower.
• Begin physiotherapy if scheduled during this period.

Swelling and discomfort are common during the first week. Everyone experiences symptoms differently, though gradual improvement should be noticeable day by day.

Full recovery from knee cartilage regeneration typically spans several months to a year, depending on the procedure:

• Early weeks: Progressive range of motion exercises, graduated weight-bearing, and stationary cycling.
• Subsequent weeks: Continued strengthening, improved mobility, possible transition from crutches.
• Mid-recovery period: More intensive rehabilitation, proprioceptive training (exercises that improve balance and joint awareness), functional exercises.
• Later months: Sport-specific training if applicable, gradual return to full activities.

Physiotherapy is important for recovery throughout this process. Your rehabilitation programme will be tailored to your specific procedure and activity goals. Compliance with physiotherapy can influence outcomes, though results depend on your unique health status and healing response.