Internal stabilization of autogenous rib cartilage grafts in rhinoplasty: a barrier to cartilage warping.

Autogenous rib cartilage grafts have gained more widespread use in rhinoplasty as dorsal onlay grafts and columellar struts. However, the usefulness of rib as a donor site has been limited by difficulties with postoperative cartilage warping. We hypothesized that the internal stabilization of rib cartilage grafts with Kirschner wires would prevent warping. The costochondral cartilages of a fresh cadaver were harvested and carved into 4 x 10 x 40 nm blocks. A single 0.035-in K-wire was placed longitudinally into the center of each of the study specimens (n = 9), whereas no internal stabilization was utilized in the control group (n = 9). Over a 10-day study period, a mean of 2.2 degrees of warping was observed in the grafts with K-wires as compared to 8.9 degrees in the control group. This indicates that internal stabilization of rib grafts significantly reduces warping (p < 0.001). In a subsequent clinical study, 28 patients underwent placement of internally stabilized columellar struts (n = 19) and/or dorsal nasal grafts (n = 12) using autogenous rib cartilage. At a mean follow-up of 13.5 months (range 3 to 36 months), graft warping was not observed in any patient. Satisfactory aesthetic results were achieved in all but one patient, in whom mild displacement of a dorsal onlay graft occurred. Palatal extrusion of the K-wire occurred in 3 of the first 9 columellar struts. This prompted an alteration in technique with no subsequent extrusions. We conclude that the internal stabilization of autogenous rib cartilage grafts with K-wires effectively prevents graft warpage.