The effects of elevation of the perichondrium from a surface of growing ear cartilage were investigated in immature rabbits. Eight 21-day-old rabbits completed the study in which perichondrium was elevated from one cartilaginous surface of one ear and the nonoperated ear served as a control. By maturity, both ears had developed symmetrically and no statistically significant difference could be demonstrated in length and surface area. Although several ears demonstrated subtle shape changes, the overall growth and development of the surgically manipulated ear cartilages did not appear to be affected. These findings appear to contradict a widely held view that perichondrial dissection of developing cartilage has a high potential for subsequent growth disturbances. The corollary has been that cartilage manipulation, such as that required in the surgical repair of the cleft lip nose deformity, should be delayed until the growth of cartilage is complete. These data would support the findings of long-term clinical studies which demonstrate the efficacy of early limited perichondrial dissection in the correction of the cleft lip nose deformity.
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