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van Veldhuizen WA, van Noortwijk R, Meesters A, Duis KT, Schuurmann R, de Vries J, Wolterink JM, IJpma F. Automatic virtual reconstruction of acetabular fractures using a statistical shape model. Eur J Trauma Emerg Surg 2024:10.1007/s00068-024-02615-7. [PMID: 39190061 DOI: 10.1007/s00068-024-02615-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 07/17/2024] [Indexed: 08/28/2024]
Abstract
PURPOSE Automatic virtual reconstruction of complex fractures would be helpful for pre-operative surgical planning. We developed a statistical shape model (SSM) which contains data of 200 intact 3D hemipelves. It allows for quantification of shape differences and is able to reconstruct abnormal shaped pelvises. We applied our SSM to reconstruct elementary and associate type acetabular fractures and assessed the reconstruction performance of the SSM, by comparing the reconstructed shape with the intact contralateral hemipelvis. METHODS In this retrospective diagnostic imaging study, we used our SSM to virtually reconstruct fractured hemipelves of eighty-three patients with an acetabular fracture. A root mean square error (RMSE) was computed between the reconstructed shape and intact contralateral shape for the whole hemipelvis and for regions relevant for plate-fitting. These plate-fitting relevant regions were defined as: (1) Iliopectineal line length and radius; (2) ischial body line length and radius; (3) acetabular diameter, (4) quadrilateral slope and (5) weight-bearing acetabular dome. RESULTS The median RMSE of the whole hemipelvis of the elementary type fractures was 2.2 (1.7-2.5) mm versus 3.2 (2.2-3.9) mm for the associate type fractures (p < 0.001). The median RMSE for the plate-fitting regions of elementary type fractures was 1.7 (1.4-2.1) mm versus 2.7 (2.0-4.1) mm for associate type fractures (p < 0.001). CONCLUSION Using a statistical shape model allows for accurate virtual reconstructions of elementary and associate type acetabular fractures within a clinically acceptable range, especially within regions important for plate-fitting. SSM-based reconstructions can serve as a valuable tool for pre-operative planning in clinical practice, when a template of the contralateral hemipelvis is unavailable.
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Affiliation(s)
- W A van Veldhuizen
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands.
| | - R van Noortwijk
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
| | - Aml Meesters
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
- 3D lab, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - K Ten Duis
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
| | - Rcl Schuurmann
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
- Multimodality Medical Imaging Group, Technical Medical Center, University of Twente, Enschede, The Netherlands
| | - Jppm de Vries
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
| | - J M Wolterink
- Department of Applied Mathematics, Technical Medical Center, University of Twente, Enschede, The Netherlands
| | - Ffa IJpma
- Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
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Lundin N, Olivecrona H, Bakhshayesh P, Gordon Murkes L, Enocson A. Computed tomography micromotion analysis in the follow-up of patients with surgically treated pelvic fractures: a prospective clinical study. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY & TRAUMATOLOGY : ORTHOPEDIE TRAUMATOLOGIE 2023; 33:3143-3151. [PMID: 37059868 PMCID: PMC10504208 DOI: 10.1007/s00590-023-03542-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 04/03/2023] [Indexed: 04/16/2023]
Abstract
PURPOSE High-energy pelvic fractures are complex injuries often requiring surgical treatment. Different radiological methods exist to evaluate the reduction and healing process postoperatively but with certain limitations. The aim of this study was to evaluate Computed Tomography Micromotion Analysis (CTMA) in a clinical setting for follow-up of surgically treated pelvic fracture patients. METHODS 10 patients surgically treated for a pelvic fracture were included and prospectively followed with Computed Tomography (CT) at 0, 6, 12 and 52 weeks postoperatively. CTMA was used to measure postoperative translation and rotation of the pelvic fracture during the 52 weeks follow-up. Clinical outcomes were collected through the questionnaires EQ-5D index score and Majeed score. RESULTS 10 patients were included with mean age (± SD, min-max) 52 (16, 31-80) years and 70% (n = 7) were males. The median (IQR, min-max) global translation from 0 to 52 weeks was 6.0 (4.6, 1.4-12.6) millimeters and median global rotation was 2.6 (2.4, 0.7-4.7) degrees. The general trend was a larger translation between 0 and 6 weeks postoperatively compared to 6-12 and 12-52 weeks. For the clinical outcomes, the general trend was that all patients started from high scores which decreased in the first postoperative follow-up and recovered to different extent during the study period. CONCLUSION CTMA was successfully used in the follow-up of surgically treated pelvic fracture patients. Movement in the pelvic fractures after surgical fixation was largest between 0 and 6 weeks.
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Affiliation(s)
- Natalie Lundin
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden.
- Department of Trauma, Acute Surgery and Orthopedics, Karolinska University Hospital, Stockholm, Sweden.
| | - Henrik Olivecrona
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
- Department of Trauma, Acute Surgery and Orthopedics, Karolinska University Hospital, Stockholm, Sweden
| | - Peyman Bakhshayesh
- Leeds General Infirmary Major Trauma Centre, University of Leeds, Leeds, UK
| | - Lena Gordon Murkes
- Department of Pediatric Radiology, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - Anders Enocson
- Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
- Department of Trauma, Acute Surgery and Orthopedics, Karolinska University Hospital, Stockholm, Sweden
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van Veldhuizen WA, van der Wel H, Kuipers HY, Kraeima J, Ten Duis K, Wolterink JM, de Vries JPPM, Schuurmann RCL, IJpma FFA. Development of a Statistical Shape Model and Assessment of Anatomical Shape Variations in the Hemipelvis. J Clin Med 2023; 12:jcm12113767. [PMID: 37297962 DOI: 10.3390/jcm12113767] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/28/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Knowledge about anatomical shape variations in the pelvis is mandatory for selection, fitting, positioning, and fixation in pelvic surgery. The current knowledge on pelvic shape variation mostly relies on point-to-point measurements on 2D X-ray images and computed tomography (CT) slices. Three-dimensional region-specific assessments of pelvic morphology are scarce. Our aim was to develop a statistical shape model of the hemipelvis to assess anatomical shape variations in the hemipelvis. CT scans of 200 patients (100 male and 100 female) were used to obtain segmentations. An iterative closest point algorithm was performed to register these 3D segmentations, so a principal component analysis (PCA) could be performed, and a statistical shape model (SSM) of the hemipelvis was developed. The first 15 principal components (PCs) described 90% of the total shape variation, and the reconstruction ability of this SSM resulted in a root mean square error of 1.58 (95% CI: 1.53-1.63) mm. In summary, an SSM of the hemipelvis was developed, which describes the shape variations in a Caucasian population and is able to reconstruct an aberrant hemipelvis. Principal component analyses demonstrated that, in a general population, anatomical shape variations were mostly related to differences in the size of the pelvis (e.g., PC1 describes 68% of the total shape variation, which is attributed to size). Differences between the male and female pelvis were most pronounced in the iliac wing and pubic rami regions. These regions are often subject to injuries. Future clinical applications of our newly developed SSM may be relevant for SSM-based semi-automatic virtual reconstruction of a fractured hemipelvis as part of preoperative planning. Lastly, for companies, using our SSM might be interesting in order to assess which sizes of pelvic implants should be produced to provide proper-fitting implants for most of the population.
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Affiliation(s)
| | - Hylke van der Wel
- Department of Oral and Maxillofacial Surgery/3D Lab, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Hennie Y Kuipers
- Department of Surgery, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Joep Kraeima
- Department of Oral and Maxillofacial Surgery/3D Lab, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Kaj Ten Duis
- Department of Surgery, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Jelmer M Wolterink
- Department of Applied Mathematics, Technical Medical Centre, 7500 AE Enschede, The Netherlands
| | - Jean-Paul P M de Vries
- Department of Surgery, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Richte C L Schuurmann
- Department of Surgery, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
- Multimodality Medical Imaging Group, Technical Medical Centre, University of Twente, 7500 AE Enschede, The Netherlands
| | - Frank F A IJpma
- Department of Surgery, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
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Bakhshayesh P, Ihediwa U, Sandher S, Vris A, Heidari N, Enocson A. A novel technique to assess rotational deformities in lower extremities using CT-based motion analysis. Sci Rep 2021; 11:21123. [PMID: 34702869 PMCID: PMC8548303 DOI: 10.1038/s41598-021-00532-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 10/07/2021] [Indexed: 11/17/2022] Open
Abstract
Rotational deformities following intramedullary (IM) nailing of tibia has a reported incidence of as high as 20%. Common techniques to measure deformities following IM nailing of tibia are either based on clinical assessment, plain X-rays or Computed Tomography (CT) comparing the treated leg with the uninjured contralateral side. All these techniques are based on examiners manual calculation inherently subject to bias. Following our previous rigorous motion analysis and symmetry studies on hemi pelvises, femurs and orthopaedic implants, we aimed to introduce a novel fully digital technique to measure rotational deformities in the lower legs. Following formal institutional approval from the Imperial College, CT images of 10 pairs of human lower legs were retrieved. Images were anonymized and uploaded to a research server. Three dimensional CT images of the lower legs were bilaterally reconstructed. CT-based motion analysis (CTMA) was used and the mirrored images of the left side were merged with the right side proximally as stationary and distally as moving objects. Discrepancies in translation and rotation were automatically calculated. Our study population had a mean age of 54 ± 20 years. There were six males and four females. We observed a greater variation in translation (mm) of Centre of Mass (COM) in sagittal plane (95% CI − 2.959–.292) which was also presented as rotational difference alongside the antero-posterior direction or Y axis (95% CI .370–1.035). In other word the right lower legs in our study were more likely to be in varus compared to the left side. However, there were no statistically significant differences in coronal or axial planes. Using our proposed fully digital technique we found that lower legs of the human adults were symmetrical in axial and coronal plane. We found sagittal plane differences which need further addressing in future using bigger sample size. Our novel recommended technique is fully digital and commercially available. This new technique can be useful in clinical practice addressing rotational deformities following orthopaedic surgical intervention. This new technique can substitute the previously introduced techniques.
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Affiliation(s)
- Peyman Bakhshayesh
- Karolinska Institutet Karolinska University Hospital, Stockholm, Sweden. .,Royal London Hospital, Barts Healthcare NHS Trust, London, UK.
| | - Ugwunna Ihediwa
- Royal London Hospital, Barts Healthcare NHS Trust, London, UK
| | - Sukha Sandher
- Royal London Hospital, Barts Healthcare NHS Trust, London, UK
| | - Alexandros Vris
- Royal London Hospital, Barts Healthcare NHS Trust, London, UK
| | - Nima Heidari
- Royal London Hospital, Barts Healthcare NHS Trust, London, UK
| | - Anders Enocson
- Karolinska Institutet Karolinska University Hospital, Stockholm, Sweden
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