Answer:
The main advantage to cartilage autografts is that they undergo less
resorption than bone. However the disadvantage is their tendency to warp.
Cartilage distortion is primarily troublesome in the nasal dorsum where
any curvature is readily apparent through the skin.
Allograft cartilage can be used because although chrondrocytes are quite
antigenic, cartilage is an immunologically privileged tissue due to its
matrix of proteoglycans which antibodies and lymphocytes are unable to
pass. Cartilage can be transplanted fresh or preserved in various ways
to decrease the antigenicity of cartilage including lyophilization, freezing,
irradiation, immersing in germicidal solutions.