Experimental freeze-preservation of chondrocytes

Preservation of articular cartilage chondrocytes is currently being investigated in conjunction with storage and transplantation of osteochondral allografts. Studies on isolated chondrocytes have suggested that viability and function may be retained following freeze-preservation. Up to 90% of frozen isolated cells will survive, and these cells are capable of producing proteoglycans in culture. Results of freezing chondrocytes in a matrix have not been as successful, with viability ranging from 0% to 50%. Inconsistent results are thought to be due to the matrix and associated problems such as poor penetration of the cryopreservative, an unequal rate of cooling, and a high water content. Studies are in progress in an attempt to produce a satisfactory method of freeze-preservation that will promote normal functioning of chondrocytes after transplantation in an articular cartilage matrix.