Cartilage transplantation technique was used to extend the alar downward according to the soft tissue tension of alar margin.
The patients with slight retraction were implanted with alar margin graft from the cavity, and the lower end of alar cartilage in the nostril was removed in severe cases, and the auricular composite tissue was transplanted to the vestibule.
The first type: if the alar collapse is obvious, the alar margin is moderately and severely retracted, and the alar cartilage is underdeveloped, it is necessary to support the graft with the alar margin and the alar lateral foot to support the graft;
The second type: if the alar margin is slightly retracted and the alar cartilage develops well, sometimes in order to prevent the alar from collapsing after operation, the alar margin will be increased to support the graft;
The third type: if the alar collapses, the alar margin retreats slightly or moderately, and the alar cartilage is hypoplastic, the lateral alar foot is needed to support the graft;
Fourthly, if the alar margin is slightly retracted and the alar cartilage is fragile and cannot support the alar margin, it is necessary to separate the aileron cartilage and reposition it.