Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists
Abstract Objective To analyze three-dimensional carpal malalignment and height in scaphoid non-union advanced collapse (SNAC) wrists. Materials and methods Twelve cone-beam CT scans of SNAC wrists were analyzed using computer-aided software to define 3D carpal axes and measure intercarpal angles and...
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BMC
2025-04-01
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| Series: | BMC Musculoskeletal Disorders |
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| Online Access: | https://doi.org/10.1186/s12891-025-08652-6 |
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| author | Mikko Alanen Samuli Aspinen Theresa Höglund Robert Sippo Eero Waris |
| author_facet | Mikko Alanen Samuli Aspinen Theresa Höglund Robert Sippo Eero Waris |
| author_sort | Mikko Alanen |
| collection | DOAJ |
| description | Abstract Objective To analyze three-dimensional carpal malalignment and height in scaphoid non-union advanced collapse (SNAC) wrists. Materials and methods Twelve cone-beam CT scans of SNAC wrists were analyzed using computer-aided software to define 3D carpal axes and measure intercarpal angles and carpal height ratio. Comparative data included 121 healthy wrists and 18 wrists with scapholunate advanced collapse (SLAC). Results SNAC wrists showed dorsal angulation of the lunate and even greater dorsal angulation of the triquetrum, resulting in an increased sagittal scapholunate angle and a decreased sagittal lunotriquetral angle compared to healthy wrists. Compared to SLAC wrists, SNAC wrists had similar sagittal radiolunate and scapholunate angles but a significantly lower lunotriquetral angle. Nonunions in the middle and distal third were associated with greater dorsal angulation of the lunate than proximal third nonunions. In the coronal plane, SNAC wrists showed ulnar tilting of the capitate and hamate compared to healthy wrists. Carpal height ratio was significantly decreased compared with healthy wrists but comparable to SLAC wrists. Conclusion Scaphoid nonunion location influenced alignment, with proximal nonunions associated with reduced dorsal angulation of the lunate. SNAC wrists differ from SLAC wrists in exhibiting a decreased sagittal lunotriquetral angle, indicating a distinct pathomechanism of carpal instability. |
| format | Article |
| id | doaj-art-7dd0ea5fc9bc4aee87ce1dc935b155f8 |
| institution | OA Journals |
| issn | 1471-2474 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | BMC |
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| series | BMC Musculoskeletal Disorders |
| spelling | doaj-art-7dd0ea5fc9bc4aee87ce1dc935b155f82025-08-20T01:48:30ZengBMCBMC Musculoskeletal Disorders1471-24742025-04-012611810.1186/s12891-025-08652-6Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wristsMikko Alanen0Samuli Aspinen1Theresa Höglund2Robert Sippo3Eero Waris4Department of Hand Surgery, University of Helsinki and Helsinki University HospitalDepartment of Hand Surgery, University of Helsinki and Helsinki University HospitalDepartment of Hand Surgery, University of Helsinki and Helsinki University HospitalDepartment of Hand Surgery, University of Helsinki and Helsinki University HospitalMehiläinen Helsinki HospitalAbstract Objective To analyze three-dimensional carpal malalignment and height in scaphoid non-union advanced collapse (SNAC) wrists. Materials and methods Twelve cone-beam CT scans of SNAC wrists were analyzed using computer-aided software to define 3D carpal axes and measure intercarpal angles and carpal height ratio. Comparative data included 121 healthy wrists and 18 wrists with scapholunate advanced collapse (SLAC). Results SNAC wrists showed dorsal angulation of the lunate and even greater dorsal angulation of the triquetrum, resulting in an increased sagittal scapholunate angle and a decreased sagittal lunotriquetral angle compared to healthy wrists. Compared to SLAC wrists, SNAC wrists had similar sagittal radiolunate and scapholunate angles but a significantly lower lunotriquetral angle. Nonunions in the middle and distal third were associated with greater dorsal angulation of the lunate than proximal third nonunions. In the coronal plane, SNAC wrists showed ulnar tilting of the capitate and hamate compared to healthy wrists. Carpal height ratio was significantly decreased compared with healthy wrists but comparable to SLAC wrists. Conclusion Scaphoid nonunion location influenced alignment, with proximal nonunions associated with reduced dorsal angulation of the lunate. SNAC wrists differ from SLAC wrists in exhibiting a decreased sagittal lunotriquetral angle, indicating a distinct pathomechanism of carpal instability.https://doi.org/10.1186/s12891-025-08652-6AnglesCarpal alignmentComputer-aidedScaphoid fractureScaphoid non-unionScaphoid non-union advanced collapse |
| spellingShingle | Mikko Alanen Samuli Aspinen Theresa Höglund Robert Sippo Eero Waris Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists BMC Musculoskeletal Disorders Angles Carpal alignment Computer-aided Scaphoid fracture Scaphoid non-union Scaphoid non-union advanced collapse |
| title | Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists |
| title_full | Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists |
| title_fullStr | Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists |
| title_full_unstemmed | Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists |
| title_short | Computer-aided three-dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists: A comparative study with scapholunate advanced collapse and healthy wrists |
| title_sort | computer aided three dimensional analysis of carpal alignment in scaphoid nonunion advanced collapse wrists a comparative study with scapholunate advanced collapse and healthy wrists |
| topic | Angles Carpal alignment Computer-aided Scaphoid fracture Scaphoid non-union Scaphoid non-union advanced collapse |
| url | https://doi.org/10.1186/s12891-025-08652-6 |
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