Hemicallotasis is a procedure where the bone (usually upper tibia) is cut through half its width and then the two parts are slowly distracted (pulled apart) using a special apparatus called an external fixator.


Callus distraction and limb realignment

New bone is thereby stimulated to fill the gap and the bone can be angled to change the forces going through it - usually to avoid pressure on a surface damaged by arthritis. This process is called 'callus distraction'.



Limb lengthening by callus distraction (callotasis). De Bastiani G, Aldegheri R, Renzi-Brivio L and Trivella G. J Pediatr Orthop. 1987 Mar-Apr;7(2):129-34.

See also -