Advanced techniques in autologous chondrocyte transplantation

Area of Science:

• Orthopedic Surgery
• Regenerative Medicine
• Cartilage Repair

Background:

• Full-thickness cartilage defects in weight-bearing areas of the knee, such as the condyles and trochlea, present a significant clinical challenge.
• Autologous chondrocyte transplantation (ACT) is a biologic resurfacing technique aiming to restore hyaline cartilage.

Purpose of the Study:

• To evaluate the efficacy and durability of autologous chondrocyte transplantation (ACT) for specific knee chondral injuries.
• To discuss surgical techniques and patient selection for successful ACT outcomes.

Main Methods:

• Review of clinical outcomes and second-look arthroscopic findings in patients undergoing ACT for specific indications.
• Analysis of biopsy results to assess the quality of repaired cartilage tissue.

Main Results:

• ACT demonstrates durable hyaline repair in correctly selected patients with full-thickness, weight-bearing condyle and femoral trochlea injuries.
• Over 90% of patients achieve satisfactory results, including return to high-level activities and sports.
• Second-look arthroscopies confirm graft integrity, and biopsies show hyaline cartilage repair, correlating with durable clinical results at 2-9 years.

Conclusions:

• Autologous chondrocyte transplantation (ACT) is a reliable treatment for specific focal chondral defects, yielding durable hyaline cartilage repair and high rates of return to activity.
• Surgical technique and rehabilitation protocols are crucial for successful outcomes, particularly in complex reconstructions.
• Current evidence does not support ACT for bipolar focal chondral injuries, and outcomes for patellar and tibial injuries require further investigation with improved techniques.