Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations
Abstract Aims Frozen shoulder and proximal humeral fracture can cause pain, stiffness and loss of function. The impact of these symptoms on patients can be measured using the comprehensively validated, 12-item Oxford Shoulder Score (OSS). Evidence suggests that pain and function may have a different...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2023-11-01
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| Series: | Journal of Orthopaedic Surgery and Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13018-023-04319-x |
| _version_ | 1797630104819466240 |
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| author | J. Simpson A. Keding S. Spencer S. Brealey A. Rangan |
| author_facet | J. Simpson A. Keding S. Spencer S. Brealey A. Rangan |
| author_sort | J. Simpson |
| collection | DOAJ |
| description | Abstract Aims Frozen shoulder and proximal humeral fracture can cause pain, stiffness and loss of function. The impact of these symptoms on patients can be measured using the comprehensively validated, 12-item Oxford Shoulder Score (OSS). Evidence suggests that pain and function may have a differential impact on patients’ experience of shoulder conditions, and this may be important for clinical management. We therefore explored the factor structure of the OSS within the UK FROST and PROFHER trial populations. Methods We performed exploratory factor analysis (EFA), followed by confirmatory factor analysis (CFA), on baseline UK FROST data from 490 of the 503 trial participants. Data at 6 months post-randomisation were used for 228 of the 250 participants for the PROFHER trial. Results UK FROST factor extraction results, using Velicer's Minimum Average Partial and Horn's Parallel Analysis tests, suggested a unifactorial solution, but two factors were weakly indicated by the less reliable ‘Kaiser’s eigenvalue > 1’ and scree tests. We explored this further using EFA. Eight items (2 to 7, 9 and 10) loaded onto a ‘Function’ factor, three on a ‘Pain’ factor (1, 8 and 12) and item 11 cross-loaded. However, one- and two-factor models were rejected in CFA. Factor extraction of PROFHER data at 6 months demonstrated a single first-order factor solution, which was also subsequently rejected in CFA. Conclusion Insufficient evidence was found, within the constraints of the data available, to support the use of ‘Pain’ and ‘Function’ sub-scales of the OSS in either patient population. |
| first_indexed | 2024-03-11T11:02:13Z |
| format | Article |
| id | doaj.art-7244b0da0884488687230a55a2e3b5b1 |
| institution | Directory Open Access Journal |
| issn | 1749-799X |
| language | English |
| last_indexed | 2024-03-11T11:02:13Z |
| publishDate | 2023-11-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Orthopaedic Surgery and Research |
| spelling | doaj.art-7244b0da0884488687230a55a2e3b5b12023-11-12T12:24:21ZengBMCJournal of Orthopaedic Surgery and Research1749-799X2023-11-011811710.1186/s13018-023-04319-xFactor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populationsJ. Simpson0A. Keding1S. Spencer2S. Brealey3A. Rangan4York Trials Unit, Department of Health Sciences, University of YorkYork Trials Unit, Department of Health Sciences, University of YorkHealth Research Institute, Edge Hill UniversityYork Trials Unit, Department of Health Sciences, University of YorkYork Trials Unit, Department of Health Sciences, University of YorkAbstract Aims Frozen shoulder and proximal humeral fracture can cause pain, stiffness and loss of function. The impact of these symptoms on patients can be measured using the comprehensively validated, 12-item Oxford Shoulder Score (OSS). Evidence suggests that pain and function may have a differential impact on patients’ experience of shoulder conditions, and this may be important for clinical management. We therefore explored the factor structure of the OSS within the UK FROST and PROFHER trial populations. Methods We performed exploratory factor analysis (EFA), followed by confirmatory factor analysis (CFA), on baseline UK FROST data from 490 of the 503 trial participants. Data at 6 months post-randomisation were used for 228 of the 250 participants for the PROFHER trial. Results UK FROST factor extraction results, using Velicer's Minimum Average Partial and Horn's Parallel Analysis tests, suggested a unifactorial solution, but two factors were weakly indicated by the less reliable ‘Kaiser’s eigenvalue > 1’ and scree tests. We explored this further using EFA. Eight items (2 to 7, 9 and 10) loaded onto a ‘Function’ factor, three on a ‘Pain’ factor (1, 8 and 12) and item 11 cross-loaded. However, one- and two-factor models were rejected in CFA. Factor extraction of PROFHER data at 6 months demonstrated a single first-order factor solution, which was also subsequently rejected in CFA. Conclusion Insufficient evidence was found, within the constraints of the data available, to support the use of ‘Pain’ and ‘Function’ sub-scales of the OSS in either patient population.https://doi.org/10.1186/s13018-023-04319-xFactor structureFrozen shoulderProximal humeral fracturePainFunction |
| spellingShingle | J. Simpson A. Keding S. Spencer S. Brealey A. Rangan Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations Journal of Orthopaedic Surgery and Research Factor structure Frozen shoulder Proximal humeral fracture Pain Function |
| title | Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations |
| title_full | Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations |
| title_fullStr | Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations |
| title_full_unstemmed | Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations |
| title_short | Factor structure of the Oxford Shoulder Score: secondary analyses of the UK FROST and PROFHER trial populations |
| title_sort | factor structure of the oxford shoulder score secondary analyses of the uk frost and profher trial populations |
| topic | Factor structure Frozen shoulder Proximal humeral fracture Pain Function |
| url | https://doi.org/10.1186/s13018-023-04319-x |
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