Abstract
Limb deformity corrective surgery has exceedingly benefited by the introduction of hexapod systems. Although the principles of deformity correction planning still remain the same as with the Ilizarov system, the corrective phase is made easier thanks to the computer-assisted simultaneous correction of deformity in all space planes. In this chapter, a new CORA-centric hexapod system named “Orthex” is described. With due respect to other existing hexapod systems, the “Orthex” fixator is credited by the authors to be more friendly, intuitive, and sophisticated in the software-based analysis of deformity, spatial location of the frame relative to the bone, and deformity correction planning. Indeed, the “Orthex” also allows the user to plan the deformity correction in consecutive phases (in “series” correction) rather than a simultaneous correction of the deformity and overcomes some of the limitations of other hexapod systems such as: frame mounting rules, need to import external data and measurements, and brand-specific nomenclature. Practical applications with clinical case descriptions are reported in the present chapter.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Abbreviations
- ACA:
-
angulation correction axis
- CORA:
-
center of rotation of angulation
- JOAL:
-
joint orientation angle line
- MPTA:
-
medial proximal tibial angle
- RDP:
-
rate determining points
- TSF:
-
Taylor Spatial Frame
References
Paley D. The principles of deformity correction by the Ilizarov technique: technical aspects. Tech Orthop. 1989;4(1):15–29.
Green SA. Ilizarov method. Clin Orthop. 1992;280:2–6.
Paley D, Tetsworth K. Mechanical axis deviation of the lower limbs: preoperative planning of multiapical frontal plane angular and bowing deformities of the femur and tibia. Clin Orthop Relat Res. 1992;280:65–71.
Tetsworth K, Paley D. Accuracy of correction of complex lower-extremity deformities by the Ilizarov method. Clin Orthop. 1994;301:102–10.
Feldman DS, Madan SS, Koval KJ, van Bosse HJP, Bazzi J, Lehman WB. Correction of tibia vara with six-axis deformity analysis and the Taylor Spatial Frame. J Pediatr Orthop. 2003;23(3):387–91.
Paley D. Principles of deformity correction. 1st ed. Berlin: Springer; 2002.
Paley D. History and science behind the six-axis correction external fixation devices in orthopaedic surgery. Oper Tech Orthop. 2011;21(2):125–8. https://doi.org/10.1053/j.oto.2011.01.011.
Hughes A, Heidari N, Mitchell S, et al. Computer hexapod-assisted orthopaedic surgery provides a predictable and safe method of femoral deformity correction. Bone Joint J. 2017;99-B(2):283–8. https://doi.org/10.1302/0301-620X.99B2.BJJ-2016-0271.R1.
Orthex hexapod fixator. www.orthex.net.
Hankemeier S, Gosling T, Richter M, Hufner T, Hochhausen C, Krettek C. Computer-assisted analysis of lower limb geometry: higher intraobserver reliability compared to conventional method. Comput Aided Surg. 2006;11(2):81–6. https://doi.org/10.3109/10929080600628985.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2021 Springer Nature Switzerland AG
About this chapter
Cite this chapter
Paley, D., Robbins, C. (2021). Hexapod External Fixators in the Treatment of Axial and Rotation Deformities and Limb Length Discrepancies. In: Massobrio, M., Mora, R. (eds) Hexapod External Fixator Systems. Springer, Cham. https://doi.org/10.1007/978-3-030-40667-7_6
Download citation
DOI: https://doi.org/10.1007/978-3-030-40667-7_6
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-40666-0
Online ISBN: 978-3-030-40667-7
eBook Packages: MedicineMedicine (R0)