Projects per year
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 confrmatory 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 frst-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.
Keywords Factor structure, Frozen shoulder, Proximal humeral fracture, Pain, Function
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 confrmatory 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 frst-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.
Keywords Factor structure, Frozen shoulder, Proximal humeral fracture, Pain, Function
| Original language | English |
|---|---|
| Article number | 846 |
| Number of pages | 7 |
| Journal | Journal of Orthopaedic Surgery and Research |
| Volume | 18 |
| DOIs | |
| Publication status | Published - 8 Nov 2023 |
Bibliographical note
© The Author(s) 2023.Projects
- 2 Finished
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NIHR HTA: UK FroST- Multi-centre randomised controlled trial with economic evaluation and nested qualitative study comparing early structured physiotherapy versus manipulation under anaesthesia versus arthroscopic capsular release for patients
1/10/14 → 30/06/19
Project: Research project (funded) › Research
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NIHR HTA: PROFHER - Pragmatic multi-centre randomised trial of surgical versus non-surgical treatment for proximal fracture of the humerus in adults
1/03/08 → 31/07/16
Project: Research project (funded) › Research