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ABSTRACT: Objective
To assess the internal construct validity, including local independence, unidimensionality, monotonicity, and invariance, reliability, and targeting of the Forgotten Joint Score within the Rasch Measurement Theory framework.Design
Cross-sectional study.Patients
A total of 111 patients with total hip arthroplasty at least 3 months after surgery.Methods
The Forgotten Joint Score was submitted to each subject during their rehabilitative treatment in an Italian centre and then to Rasch analysis.Results
The base Rasch analysis showed a satisfactory fit to the model with strict unidimensionality and no differential item functioning. However, monotonicity (11 out of 12 items showed disordered thresholds) and local independence were violated. After rescoring 10 items and creating 5 subtests to account for local dependence, the scale satisfied all the other Rasch model requirements (i.e. invariance, local independence, monotonicity, unidimensionality, and multi-group invariance), with reliability indexes (> 0.850) for measurement at the individual level and proper targeting. A raw-score-to-measure conversion table was provided.Conclusion
After structural (i.e. collapsing items categories) and non-structural (i.e. creating subtests) strategies, the Forgotten Joint Score satisfied the measurement requirements of the Rasch model, and it can be used in patients with total hip arthroplasty in clinical and research settings.
SUBMITTER: Stano F
PROVIDER: S-EPMC10795689 | biostudies-literature | 2024 Jan
REPOSITORIES: biostudies-literature
Stano Flavia F Pellicciari Leonardo L La Porta Fabio F Piscitelli Daniele D Angilecchia Domenico D Signorelli Maria M Giovannico Giuseppe G Pournajaf Sanaz S Caselli Serena S
Journal of rehabilitation medicine 20240110
<h4>Objective</h4>To assess the internal construct validity, including local independence, unidimensionality, monotonicity, and invariance, reliability, and targeting of the Forgotten Joint Score within the Rasch Measurement Theory framework.<h4>Design</h4>Cross-sectional study.<h4>Patients</h4>A total of 111 patients with total hip arthroplasty at least 3 months after surgery.<h4>Methods</h4>The Forgotten Joint Score was submitted to each subject during their rehabilitative treatment in an Ital ...[more]