Tissue response during monofocal and bifocal leg lengthening in patients.
J Orthop Res
; 20(1): 137-41, 2002 Jan.
Article
em En
| MEDLINE
| ID: mdl-11853080
ABSTRACT
The purpose of this investigation was to compare the tissue response during mono- and bifocal limb lengthening. The study includes four patients undergoing leg lengthening. All patients started out bifocally with a total diurnal distraction of 1.75 mm, but proceeded monofocally with a rate of 1 mm a day when the distal distraction was terminated due to contractures or pain. The tissue response was monitored by registration of axial force in the distraction rods. The force increased linearly during bifocal lengthening, but culminated or decreased in the period of monofocal lengthening. Average tissue stiffness, defined as the immediate force increase due to each 0.25 mm distraction increment, was significantly higher in the bifocal lengthening phase. The force decay between each distraction was significantly lower during bifocal lengthening, thus indicating decreased tissue accommodation. Details in the force registrations indicated that the soft tissue, not the regenerate, was the main contributor to the tensile force. Conclusively, the tissues at the two osteotomy sites do not lengthen independently. Bifocal lengthening exposes the entire soft tissue to large loads, resulting in increased tissue stiffness and reduced ability to adapt to the increased length. Accordingly, bifocal leg lengthening requires special attention to soft tissue adaptation.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Osteogênese
/
Técnica de Ilizarov
/
Desigualdade de Membros Inferiores
Limite:
Humans
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article