Evaluation of a method for digital definition of bone shapes

Philipp Peloschek, Georg Langs, Martin Urschler, J. Sailer, M. Uffmann, T. Schlager, Franz Kainberger, Horst Bischof

Research output: Contribution to conferenceAbstractResearchpeer-review

Abstract

Purpose: To examine the influence of posterior instrumentation on content and distribution of subchondral mineralization as a correlate of a long-term load acting on adjacent and transfixed facets.
Materials and Methods: 23 patients with thoraco-lumbar fractures had CTs and received posterior fixation. Patients were divided into group A (second CT on an average of 7.3 days) and group B (second CT on an average of 17 months after
implant removal). CT-OAM was performed. Facet joints were separated on each CT-slice and 3D-reconstructed. The subchondral bone plate in each slice was isolated and reconstructed. In the density image summarized HU were represented by false colors. Finally, the density images were projected onto the 3D images. The resulting pictures were used to evaluate intra-individual changes in mineralization of paired facets joints by visual and quantitative analysis.
Results: There were significant differences between groups A and B with an overall mineralization decrease in group A and an increase in group B. In group A no significant differences between adjacent and transfixed facets were found, in group B the suprajacent joints showed a significantly higher mineralization increase than the transfixed joints.
Conclusion: Decrease in subchondral mineralization indicates reduced load upon the facets. This finding in patients with early follow-up seems to be caused by reduced activity until implant removal. In patients with longer follow-up intervals
higher loads are shown which might be caused by unphysiological long-term stress induced by stabilization. Whether these changes lead to spondylarthritis has to be the subject of further studies.
Original languageEnglish
Pages191-192
Publication statusPublished - 2005
EventEuropean Congress of Radiology - , Austria
Duration: 4 Mar 20057 Mar 2005

Conference

ConferenceEuropean Congress of Radiology
Abbreviated titleECR
CountryAustria
Period4/03/057/03/05

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Zygapophyseal Joint
Bone and Bones
Spondylarthritis
Joints
Bone Plates
Color

Fields of Expertise

  • Information, Communication & Computing

Cite this

Peloschek, P., Langs, G., Urschler, M., Sailer, J., Uffmann, M., Schlager, T., ... Bischof, H. (2005). Evaluation of a method for digital definition of bone shapes. 191-192. Abstract from European Congress of Radiology, Austria.

Evaluation of a method for digital definition of bone shapes. / Peloschek, Philipp; Langs, Georg; Urschler, Martin; Sailer, J.; Uffmann, M.; Schlager, T.; Kainberger, Franz; Bischof, Horst.

2005. 191-192 Abstract from European Congress of Radiology, Austria.

Research output: Contribution to conferenceAbstractResearchpeer-review

Peloschek, P, Langs, G, Urschler, M, Sailer, J, Uffmann, M, Schlager, T, Kainberger, F & Bischof, H 2005, 'Evaluation of a method for digital definition of bone shapes' European Congress of Radiology, Austria, 4/03/05 - 7/03/05, pp. 191-192.
Peloschek P, Langs G, Urschler M, Sailer J, Uffmann M, Schlager T et al. Evaluation of a method for digital definition of bone shapes. 2005. Abstract from European Congress of Radiology, Austria.
Peloschek, Philipp ; Langs, Georg ; Urschler, Martin ; Sailer, J. ; Uffmann, M. ; Schlager, T. ; Kainberger, Franz ; Bischof, Horst. / Evaluation of a method for digital definition of bone shapes. Abstract from European Congress of Radiology, Austria.
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abstract = "Purpose: To examine the influence of posterior instrumentation on content and distribution of subchondral mineralization as a correlate of a long-term load acting on adjacent and transfixed facets.Materials and Methods: 23 patients with thoraco-lumbar fractures had CTs and received posterior fixation. Patients were divided into group A (second CT on an average of 7.3 days) and group B (second CT on an average of 17 months afterimplant removal). CT-OAM was performed. Facet joints were separated on each CT-slice and 3D-reconstructed. The subchondral bone plate in each slice was isolated and reconstructed. In the density image summarized HU were represented by false colors. Finally, the density images were projected onto the 3D images. The resulting pictures were used to evaluate intra-individual changes in mineralization of paired facets joints by visual and quantitative analysis.Results: There were significant differences between groups A and B with an overall mineralization decrease in group A and an increase in group B. In group A no significant differences between adjacent and transfixed facets were found, in group B the suprajacent joints showed a significantly higher mineralization increase than the transfixed joints.Conclusion: Decrease in subchondral mineralization indicates reduced load upon the facets. This finding in patients with early follow-up seems to be caused by reduced activity until implant removal. In patients with longer follow-up intervalshigher loads are shown which might be caused by unphysiological long-term stress induced by stabilization. Whether these changes lead to spondylarthritis has to be the subject of further studies.",
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T1 - Evaluation of a method for digital definition of bone shapes

AU - Peloschek, Philipp

AU - Langs, Georg

AU - Urschler, Martin

AU - Sailer, J.

AU - Uffmann, M.

AU - Schlager, T.

AU - Kainberger, Franz

AU - Bischof, Horst

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N2 - Purpose: To examine the influence of posterior instrumentation on content and distribution of subchondral mineralization as a correlate of a long-term load acting on adjacent and transfixed facets.Materials and Methods: 23 patients with thoraco-lumbar fractures had CTs and received posterior fixation. Patients were divided into group A (second CT on an average of 7.3 days) and group B (second CT on an average of 17 months afterimplant removal). CT-OAM was performed. Facet joints were separated on each CT-slice and 3D-reconstructed. The subchondral bone plate in each slice was isolated and reconstructed. In the density image summarized HU were represented by false colors. Finally, the density images were projected onto the 3D images. The resulting pictures were used to evaluate intra-individual changes in mineralization of paired facets joints by visual and quantitative analysis.Results: There were significant differences between groups A and B with an overall mineralization decrease in group A and an increase in group B. In group A no significant differences between adjacent and transfixed facets were found, in group B the suprajacent joints showed a significantly higher mineralization increase than the transfixed joints.Conclusion: Decrease in subchondral mineralization indicates reduced load upon the facets. This finding in patients with early follow-up seems to be caused by reduced activity until implant removal. In patients with longer follow-up intervalshigher loads are shown which might be caused by unphysiological long-term stress induced by stabilization. Whether these changes lead to spondylarthritis has to be the subject of further studies.

AB - Purpose: To examine the influence of posterior instrumentation on content and distribution of subchondral mineralization as a correlate of a long-term load acting on adjacent and transfixed facets.Materials and Methods: 23 patients with thoraco-lumbar fractures had CTs and received posterior fixation. Patients were divided into group A (second CT on an average of 7.3 days) and group B (second CT on an average of 17 months afterimplant removal). CT-OAM was performed. Facet joints were separated on each CT-slice and 3D-reconstructed. The subchondral bone plate in each slice was isolated and reconstructed. In the density image summarized HU were represented by false colors. Finally, the density images were projected onto the 3D images. The resulting pictures were used to evaluate intra-individual changes in mineralization of paired facets joints by visual and quantitative analysis.Results: There were significant differences between groups A and B with an overall mineralization decrease in group A and an increase in group B. In group A no significant differences between adjacent and transfixed facets were found, in group B the suprajacent joints showed a significantly higher mineralization increase than the transfixed joints.Conclusion: Decrease in subchondral mineralization indicates reduced load upon the facets. This finding in patients with early follow-up seems to be caused by reduced activity until implant removal. In patients with longer follow-up intervalshigher loads are shown which might be caused by unphysiological long-term stress induced by stabilization. Whether these changes lead to spondylarthritis has to be the subject of further studies.

M3 - Abstract

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