A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions
Objectives: The literature on humeral torsion angles (retrotorsion) reveals great inconsistencies between methodology and values. Decreased retrotorsion was suspected to correlate with instability, but evidence is contradictory. The measurement according to the gold standard method of Bernageau and...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | European Journal of Radiology Open |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352047722000752 |
| _version_ | 1827923801963233280 |
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| author | Stefan Demarmels Holger Grehn Dirk Müller Andreas U. Freiburghaus Arno Frigg |
| author_facet | Stefan Demarmels Holger Grehn Dirk Müller Andreas U. Freiburghaus Arno Frigg |
| author_sort | Stefan Demarmels |
| collection | DOAJ |
| description | Objectives: The literature on humeral torsion angles (retrotorsion) reveals great inconsistencies between methodology and values. Decreased retrotorsion was suspected to correlate with instability, but evidence is contradictory. The measurement according to the gold standard method of Bernageau and Godefroy (B&G) can be challenging especially in the presence of Hill-Sachs-lesions. Therefore, we have developed and evaluated a new measurement method for the humeral torsion angle on MRI-scans. Materials and Methods: Three investigators have measured 67 patients (35 with shoulder instability, 32 healthy) on axial MRIs with 603 measurements used for reliability calculation. The new Circle-method determines the retrotorsion by overlaying two circles on the transversal section of the humeral head. The first circle is adjusted congruent with the margin of the humeral head, whereas the second circle is adjusted to the greater tubercle. The line bisecting the centres of these circles is defined as the humeral head axis. This method was compared to B&G. Results: The mean retrotorsion angle of all patients was 25°± 25° (mean ± SD) with B&G, and 24° ± 27° with the Circle-method. Neither method revealed a significant difference between stable and unstable shoulders (p = 0.47). Of the 35 patients with unstable shoulders 21 (60%) presented Hill-Sachs lesions. No significant differences between patients with or without Hill-Sachs lesions (Circle-method: p = 0.61; B&G: p = 0.67). The reliability parameters for both methods were similar. Conclusions: The new Circle-method is as precise as the method of B&G. It may yield more consistent values in cases with substantial Hill-Sachs-lesions. Our data do not suggest retrotorsion as a predictor of instability. |
| first_indexed | 2024-03-13T05:02:21Z |
| format | Article |
| id | doaj.art-01fb170224fe470594e9926eb10e5ab1 |
| institution | Directory Open Access Journal |
| issn | 2352-0477 |
| language | English |
| last_indexed | 2024-03-13T05:02:21Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | European Journal of Radiology Open |
| spelling | doaj.art-01fb170224fe470594e9926eb10e5ab12023-06-17T05:18:49ZengElsevierEuropean Journal of Radiology Open2352-04772023-01-0110100468A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesionsStefan Demarmels0Holger Grehn1Dirk Müller2Andreas U. Freiburghaus3Arno Frigg4Department of Orthopaedic and Trauma Surgery, Kantonsspital Graubünden, Chur, SwitzerlandDepartment of Orthopaedic and Trauma Surgery, Kantonsspital Graubünden, Chur, SwitzerlandDepartment of Radiology, Kantonsspital Graubünden, Chur, SwitzerlandUniversity of Zürich, Zürich, SwitzerlandDepartment of Orthopaedic and Trauma Surgery, Kantonsspital Graubünden, Chur, Switzerland; Department of Orthopaedic Surgery, University Hospital Basel, Basel, Switzerland; Correspondence to: Prof. Dr. med. Arno Frigg, Kantonsspital Graubünden, Department of Orthopaedic and Trauma Surgery, CH-7000 Chur, Switzerland.Objectives: The literature on humeral torsion angles (retrotorsion) reveals great inconsistencies between methodology and values. Decreased retrotorsion was suspected to correlate with instability, but evidence is contradictory. The measurement according to the gold standard method of Bernageau and Godefroy (B&G) can be challenging especially in the presence of Hill-Sachs-lesions. Therefore, we have developed and evaluated a new measurement method for the humeral torsion angle on MRI-scans. Materials and Methods: Three investigators have measured 67 patients (35 with shoulder instability, 32 healthy) on axial MRIs with 603 measurements used for reliability calculation. The new Circle-method determines the retrotorsion by overlaying two circles on the transversal section of the humeral head. The first circle is adjusted congruent with the margin of the humeral head, whereas the second circle is adjusted to the greater tubercle. The line bisecting the centres of these circles is defined as the humeral head axis. This method was compared to B&G. Results: The mean retrotorsion angle of all patients was 25°± 25° (mean ± SD) with B&G, and 24° ± 27° with the Circle-method. Neither method revealed a significant difference between stable and unstable shoulders (p = 0.47). Of the 35 patients with unstable shoulders 21 (60%) presented Hill-Sachs lesions. No significant differences between patients with or without Hill-Sachs lesions (Circle-method: p = 0.61; B&G: p = 0.67). The reliability parameters for both methods were similar. Conclusions: The new Circle-method is as precise as the method of B&G. It may yield more consistent values in cases with substantial Hill-Sachs-lesions. Our data do not suggest retrotorsion as a predictor of instability.http://www.sciencedirect.com/science/article/pii/S2352047722000752Humeral torsion anglesMethodologyMRICT |
| spellingShingle | Stefan Demarmels Holger Grehn Dirk Müller Andreas U. Freiburghaus Arno Frigg A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions European Journal of Radiology Open Humeral torsion angles Methodology MRI CT |
| title | A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions |
| title_full | A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions |
| title_fullStr | A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions |
| title_full_unstemmed | A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions |
| title_short | A new circle method for measuring humeral torsion on MRI-scans less sensitive to Hill-Sachs lesions |
| title_sort | new circle method for measuring humeral torsion on mri scans less sensitive to hill sachs lesions |
| topic | Humeral torsion angles Methodology MRI CT |
| url | http://www.sciencedirect.com/science/article/pii/S2352047722000752 |
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