Limb Lengthening by Callus Distraction (Callotasis)

TLDR

Callotasis is a limb‑lengthening technique that slowly distracts callus formed after a proximal submetaphyseal corticotomy. A dynamic axial fixator with telescoping capabilities is employed; distraction begins after two weeks, the fixator is locked until callus formation, then the locking screw is released and dynamic axial loading promotes corticalization. In 100 bone segments lengthened in 50 patients with limb‑length inequality and 23 with achondroplasia, the mean lengthening was 22 % (maximum 58 %) and 14 complications (14 %) were reported.

Abstract

Callotasis is a new technique of limb lengthening involving slow distraction of the callus formed in response to a proximal submetaphyseal corticotomy. Using a dynamic axial fixator with telescoping capabilities, distraction begins after 2 weeks. When the required length is attained, the fixator is held in the rigid mode until radiographic evidence of callus is observed. The locking screw is then released, and dynamic axial loading is instituted to promote corticalization. One hundred bony segments have been lengthened; 50 patients had limb length inequality, and 23 had achondroplasia. The mean lengthening achieved was 22% (maximum, 58%). There were 14 complications (14%).