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. 2022 Sep;12(7):1345-1351.
doi: 10.1177/2192568220979136. Epub 2021 Jan 28.

Supine Traction Versus Prone Bending Radiographs for Assessing the Curve Flexibility in Spinal Deformity

Niek Te Hennepe  1 , Maarten Spruit  1 , Martin H Pouw  1 , Marco Hinderks  2 , Petra Heesterbeek  3
Affiliations

Supine Traction Versus Prone Bending Radiographs for Assessing the Curve Flexibility in Spinal Deformity

Niek Te Hennepe et al. Global Spine J. 2022 Sep.

Abstract

Study design: Retrospective cohort study.

Objectives: No consensus exists among surgeons on which radiologic method to prefer for the assessment of curve flexibility in spinal deformity. The objective of this study was to evaluate the difference in curve correction on supine traction radiographs versus prone side bending radiographs.

Methods: A retrospective analysis of idiopathic scoliosis (IS), degenerative idiopathic scoliosis (DIS) and de novo degenerative lumbar scoliosis (DNDLS) patients was performed on supine traction as well as prone bending films (when available). Age, weight, traction force, diagnosis and Cobb angles of the primary and secondary curves were extracted. Differences in curve correction (percentages) on traction versus prone bending radiographs were analyzed for the primary and secondary curve. Subgroup analyses were performed for the 3 different diagnoses.

Results: In total, 170 patients were eligible for inclusion. 43 were diagnosed with IS, 58 with DIS and 69 with DNDLS. For the primary curve, greater curve correction was obtained with bending in the DNDLS group (P < 0.001). In the DIS group, there was a trend toward more correction on bending (P = 0.054). In de IS group no difference was found. For the secondary curve, bending showed more curve correction in the IS and DIS group (P = 0.002 and P <0.001). No difference was found in the DNDLS group.

Conclusion: Compared to traction radiographs, bending radiographs better serve the purpose of curve flexibility assessment of IS, DIS and DNDLS spinal deformity, despite the fact that patients are exposed to more radiation.

Keywords: bending; flexibility assessment; scoliosis; traction.

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Conflict of interest statement

Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1.
Figure 1.
Traction technique in supine position, with ankles fixated and a dynamometer attached to the head halter. One employee applies traction force.
Figure 2.
Figure 2.
Bending technique in prone position. The patient is asked to bend in maximally both sides.
Figure 3.
Figure 3.
Flowchart of the inclusion and exclusion of radiographs.
See this image and copyright information in PMC

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