Engineering Transactions, 49, 2-3, pp. 431-436, 2001

Optimal Three-Dimensional Correction of Idiopathic Scoliosis

T. Kotwicki
University of Medical Sciences, Poznań

W. Marciniak
University of Medical Sciences, Poznań

We have reviewed the standing position antero-posterior and lateral radiographs of 64 children operated on for juvenile or adolescent idiopathic scoliosis. Twenty five patients had Cotrel-Dubousset posterior instrumentation, twenty one were corrected with Pouliquen anterior plate and twenty one with Harrington distraction rod. The transversal plane of the spine was visualised by computer reconstruction using sonic digitizer GP-9 and the programme Rachis. The following parameters were compared : Cobb angle, Perdriolle angle of vertebral rotation, apical vertebra transposition. Transversal plane reconstruction images were also compared. The results showed better 3-D correction in Cotrel-Dubousset technique over the Harrington technique. This concerned Cobb angle and apical vertebra transposition but not the vertebral rotation. The anterior instrumentation gave the best correction in each of the three planes. In particular, the vertebral rotation was significantly diminished with anterior technique. The results were also confirmed by computer reconstruction of the transversal plane of the spine. The authors conclude that vertebral derotation can hardly be achieved with posterior spinal techniques, regardless of the type of instrumentation applied. Following the biomechanical analysis of the spatial displacement of each vertebra of the scoliotic curve after operation, a complex movement of the corrected spine can be evaluated.
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J.R. COBB, Outline for the study of scoliosis, Course Lectures. Amer. Academy of Orthopaedics, 261, 1948.

Y. COTREL, J. DUBOUSSET, C-D instrumentation en chirurgie rachidienne, Sauramps Medical, Montpellier, France 1992.

P.L. HARRINGTON, Treatment of scoliosis. Correction and internal fixation by spine instrumentation, J. Bone Joint Surg., 44-A,591, 1962.

J. HECQUET, Rachis 91TM, Manuel opératoire, Paris 1997.

R. PERDRIOLLE, La scoliose. Son étude tridimensionnelle, S.A. MALOINE [Ed.], Paris 1979.

J.C. POULIQUEN, P. RIGAULT, J.P. PADOVANI, J. BENEUX, G.F. PENNEÇOT, G. GUYONVARCH, Redressement par plaque des scolioses, Résultats de 99 cas vus avec recul. Rev. Chir. Orthop., 70, 93–108, 1984.

A. TANGUY, M. IMBERT, O. CASTILLO, S. BOISGARD, Etude biomechanique comparative des matériels postérieurs [In:] Scoliose idiopathique, J. BERARD, R. KOHLER [Eds.], Sauramps Medical, Montpellier, 217–227, 1997.

J.J. TELEGA, T. LEKSZYCKI, Bone remodeling and adaptation of bones: models and numerical solutions [in Polish], Workshop of "Biomechanics of Skeletal System", I.F.T.R. Polish Acad. of Sci., Warszawa 21–22.05, 1999.

D. TYLMAN, Mechanics of scoliosis [in Polish], Severus, Warszawa 1995.

DOI: 10.24423/engtrans.568.2001