The Rate of Warping in Irradiated and Nonirradiated Homograft Rib Cartilage: A Controlled Comparison and Clinical Implication.In this study it was concluded that there was no difference in warping characteristics between irradiated and nonirradiated homograft (allograft) rib cartilage. Make note:
The centrally cut pieces of cartilage in each group warped less than peripherally cut blocks in each group.
Prevailing concerns with ICC and Costal AutoGrafts:
Homologous irradiated costal cartilage (ICC) has been shown to resorb on long-term follow-up and has the potential to warp but studies have shown contradictory results. In addition to problems with resorption, warping, and bacterial infection fear of viral transmission despite extensive sterilization has severely reduced its usage. However, irradiation of soft tissue allografts (ICC) with high dosage(>3Mrad) radiation can sterilize allograft tissue, destroying bacteria and viruses including HIV and hepatitis. [For more info. on risks of infection and transmitted diseases from allografts see my post Nov.25/10] Costal cartilage autografts provides a large volume of graft material with excellent structural support.Autogenous rib grafts are known to warp,buckle and absorption can occur and be somewhat unpredictable, but there are techniques a well informed or experienced surgeon will incorporate to limit warping capabilities in rib grafts. [See my post on techniques used to reduce warping - dated Nov 7/2010]. So the general disadvantages of Costal grafts are warping, potential donor site morbidities, including pneumothorax, scar visibility, and chest wall deformity, but once again keep in mind these can be avoided or be marginalized when performed by a surgeon who's well experienced in performing costal grafting.
A cadaveric analysis of the ideal costal cartilage graft for Asian rhinoplasty.
Rib Cartilage Safe for Rhinoplasty
Irradiated costal cartilage in augmentation rhinoplasty