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Keenan BE, Pettet GJ, Izatt MT, et al. Gravity-induced coronal plane joint moments in adolescent idiopathic scoliosis. Scoliosis. 2015;10:35doi: 10.1186/s13013-015-0060-9.
Keenan, B. E., Pettet, G. J., Izatt, M. T., Askin, G. N., Labrom, R. D., Pearcy, M. J., & Adam, C. (2015). Gravity-induced coronal plane joint moments in adolescent idiopathic scoliosis. Scoliosis, 1035. https://doi.org/10.1186/s13013-015-0060-9
Keenan, Bethany E, et al. "Gravity-induced coronal plane joint moments in adolescent idiopathic scoliosis." Scoliosis vol. 10 (2015): 35. doi: https://doi.org/10.1186/s13013-015-0060-9
Keenan BE, Pettet GJ, Izatt MT, Askin GN, Labrom RD, Pearcy MJ, Adam C. Gravity-induced coronal plane joint moments in adolescent idiopathic scoliosis. Scoliosis. 2015 Dec 17;10:35. doi: 10.1186/s13013-015-0060-9. eCollection 2015. PMID: 26681978; PMCID: PMC4682283.
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Scoliosis. 2015 Dec 17;10:35. doi: 10.1186/s13013-015-0060-9. eCollection 2015.

Gravity-induced coronal plane joint moments in adolescent idiopathic scoliosis.

Scoliosis

Bethany E Keenan, Graeme J Pettet, Maree T Izatt, Geoffrey N Askin, Robert D Labrom, Mark J Pearcy, Clayton Adam

Affiliations

  1. Paediatric Spine Research Group, Institute of Health and Biomedical Innovation, Queensland University of Technology and Mater Health Services, Brisbane, 4101 Queensland Australia.
  2. Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD Australia.

PMID: 26681978 PMCID: PMC4682283 DOI: 10.1186/s13013-015-0060-9

Abstract

BACKGROUND: Adolescent Idiopathic Scoliosis is the most common type of spinal deformity, and whilst the isk of progression appears to be biomechanically mediated (larger deformities are more likely to progress), the detailed biomechanical mechanisms driving progression are not well understood. Gravitational forces in the upright position are the primary sustained loads experienced by the spine. In scoliosis they are asymmetrical, generating moments about the spinal joints which may promote asymmetrical growth and deformity progression. Using 3D imaging modalities to estimate segmental torso masses allows the gravitational loading on the scoliotic spine to be determined. The resulting distribution of joint moments aids understanding of the mechanics of scoliosis progression.

METHODS: Existing low-dose CT scans were used to estimate torso segment masses and joint moments for 20 female scoliosis patients. Intervertebral joint moments at each vertebral level were found by summing the moments of each of the torso segment masses above the required joint.

RESULTS: The patients' mean age was 15.3 years (SD 2.3; range 11.9-22.3 years); mean thoracic major Cobb angle 52(°) (SD 5.9(°); range 42-63(°)) and mean weight 57.5 kg (SD 11.5 kg; range 41-84.7 kg). Joint moments of up to 7 Nm were estimated at the apical level. No significant correlation was found between the patients' major Cobb angles and apical joint moments.

CONCLUSIONS: Patients with larger Cobb angles do not necessarily have higher joint moments, and curve shape is an important determinant of joint moment distribution. These findings may help to explain the variations in progression between individual patients. This study suggests that substantial corrective forces are required of either internal instrumentation or orthoses to effectively counter the gravity-induced moments acting to deform the spinal joints of idiopathic scoliosis patients.

Keywords: Adolescent idiopathic scoliosis (AIS); Computed tomography (CT); Gravity; Imaging; Instantaneous centre of rotation (ICR); Joint moments; Scoliosis; Scoliosis progression

References

  1. Spine (Phila Pa 1976). 1979 Jan-Feb;4(1):1-8 - PubMed
  2. Eur Spine J. 2013 Feb;22(2):324-9 - PubMed
  3. J Bone Joint Surg Am. 2001 Aug;83-A(8):1169-81 - PubMed
  4. Eur Spine J. 2007 Oct;16(10):1621-8 - PubMed
  5. Spine (Phila Pa 1976). 2005 Jun 1;30(11):1283-6 - PubMed
  6. Ann Biomed Eng. 1996 Mar-Apr;24(2):198-210 - PubMed
  7. Spine (Phila Pa 1976). 2009 Jan 1;34(1):91-9 - PubMed
  8. Pediatr Surg Int. 2008 Feb;24(2):129-44 - PubMed
  9. Spine (Phila Pa 1976). 1985 Jun;10(5):425-7 - PubMed
  10. Aust N Z J Surg. 1993 Mar;63(3):205-12 - PubMed
  11. Scoliosis. 2014 Oct 08;9:16 - PubMed
  12. Clin Orthop Relat Res. 1977 Jul-Aug;(126):17-25 - PubMed
  13. Spine (Phila Pa 1976). 2004 Oct 1;29(19):2103-7 - PubMed
  14. Spine (Phila Pa 1976). 2011 Aug 15;36(18):1470-7 - PubMed
  15. Spine (Phila Pa 1976). 2008 Jan 15;33(2):E30-7 - PubMed
  16. Clin Biomech (Bristol, Avon). 2014 Aug;29(7):773-9 - PubMed
  17. Clin Orthop. 1958;11:111-9 - PubMed
  18. Scoliosis. 2013 Jul 02;8(1):11 - PubMed
  19. J Spinal Disord Tech. 2002 Feb;15(1):47-51; discussion 51-2 - PubMed
  20. J Bone Joint Surg Am. 2000 Aug;82-A(8):1157-68 - PubMed
  21. Ann Biomed Eng. 1984;12(6):621-30 - PubMed
  22. J Biomech. 2013 Jul 26;46(11):1948-54 - PubMed
  23. J Biomech Eng. 2002 Dec;124(6):784-90 - PubMed
  24. Scoliosis. 2006 Oct 18;1:16 - PubMed
  25. Spine (Phila Pa 1976). 1997 Nov 1;22(21):2495-503 - PubMed

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